# projecteuler **Repository Path**: ZenQy/projecteuler ## Basic Information - **Project Name**: projecteuler - **Description**: My code for solving problems at Project Euler - **Primary Language**: Go - **License**: WTFPL - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2018-06-04 - **Last Updated**: 2020-12-19 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # projecteuler #### Description My code for solving problems at Project Euler #### the File List
Page_1 ID | Title | Solved :----:|:----:|:----: 1 | [Multiples of 3 and 5](Page_1/1.go) | Yes 2 | [Even Fibonacci numbers](Page_1/2.go) | Yes 3 | [Largest prime factor](Page_1/3.go) | Yes 4 | [Largest palindrome product](Page_1/4.go) | Yes 5 | [Smallest multiple](Page_1/5.go) | Yes 6 | [Sum square difference](Page_1/6.go) | Yes 7 | [10001st prime](Page_1/7.go) | Yes 8 | [Largest product in a series](Page_1/8.go) | Yes 9 | [Special Pythagorean triplet](Page_1/9.go) | Yes 10 | [Summation of primes](Page_1/10.go) | Yes 11 | [Largest product in a grid](Page_1/11.go) | Yes 12 | [Highly divisible triangular number](Page_1/12.go) | Yes 13 | [Large sum](Page_1/13.go) | Yes 14 | [Longest Collatz sequence](Page_1/14.go) | Yes 15 | [Lattice paths](Page_1/15.go) | Yes 16 | [Power digit sum](Page_1/16.go) | Yes 17 | [Number letter counts](Page_1/17.go) | Yes 18 | [Maximum path sum I](Page_1/18.go) | Yes 19 | [Counting Sundays](Page_1/19.go) | No 20 | [Factorial digit sum](Page_1/20.go) | No 21 | [Amicable numbers](Page_1/21.go) | No 22 | [Names scores](Page_1/22.go) | No 23 | [Non-abundant sums](Page_1/23.go) | No 24 | [Lexicographic permutations](Page_1/24.go) | No 25 | [1000-digit Fibonacci number](Page_1/25.go) | No 26 | [Reciprocal cycles](Page_1/26.go) | No 27 | [Quadratic primes](Page_1/27.go) | No 28 | [Number spiral diagonals](Page_1/28.go) | No 29 | [Distinct powers](Page_1/29.go) | Yes 30 | [Digit fifth powers](Page_1/30.go) | No 31 | [Coin sums](Page_1/31.go) | No 32 | [Pandigital products](Page_1/32.go) | No 33 | [Digit cancelling fractions](Page_1/33.go) | No 34 | [Digit factorials](Page_1/34.go) | No 35 | [Circular primes](Page_1/35.go) | No 36 | [Double-base palindromes](Page_1/36.go) | No 37 | [Truncatable primes](Page_1/37.go) | Yes 38 | [Pandigital multiples](Page_1/38.go) | Yes 39 | [Integer right triangles](Page_1/39.go) | Yes 40 | [Champernowne's constant](Page_1/40.go) | Yes 41 | [Pandigital prime](Page_1/41.go) | Yes 42 | [Coded triangle numbers](Page_1/42.go) | Yes 43 | [Sub-string divisibility](Page_1/43.go) | Yes 44 | [Pentagon numbers](Page_1/44.go) | Yes 45 | [Triangular, pentagonal, and hexagonal](Page_1/45.go) | Yes 46 | [Goldbach's other conjecture](Page_1/46.go) | Yes 47 | [Distinct primes factors](Page_1/47.go) | Yes 48 | [Self powers](Page_1/48.go) | Yes 49 | [Prime permutations](Page_1/49.go) | Yes 50 | [Consecutive prime sum](Page_1/50.go) | Yes
Page_2 ID | Title | Solved :----:|:----:|:----: 51 | [Prime digit replacements](Page_2/51.go) | No 52 | [Permuted multiples](Page_2/52.go) | No 53 | [Combinatoric selections](Page_2/53.go) | No 54 | [Poker hands](Page_2/54.go) | No 55 | [Lychrel numbers](Page_2/55.go) | No 56 | [Powerful digit sum](Page_2/56.go) | No 57 | [Square root convergents](Page_2/57.go) | No 58 | [Spiral primes](Page_2/58.go) | No 59 | [XOR decryption](Page_2/59.go) | No 60 | [Prime pair sets](Page_2/60.go) | No 61 | [Cyclical figurate numbers](Page_2/61.go) | No 62 | [Cubic permutations](Page_2/62.go) | No 63 | [Powerful digit counts](Page_2/63.go) | No 64 | [Odd period square roots](Page_2/64.go) | No 65 | [Convergents of e](Page_2/65.go) | No 66 | [Diophantine equation](Page_2/66.go) | No 67 | [Maximum path sum II](Page_2/67.go) | No 68 | [Magic 5-gon ring](Page_2/68.go) | No 69 | [Totient maximum](Page_2/69.go) | No 70 | [Totient permutation](Page_2/70.go) | No 71 | [Ordered fractions](Page_2/71.go) | No 72 | [Counting fractions](Page_2/72.go) | No 73 | [Counting fractions in a range](Page_2/73.go) | No 74 | [Digit factorial chains](Page_2/74.go) | No 75 | [Singular integer right triangles](Page_2/75.go) | No 76 | [Counting summations](Page_2/76.go) | No 77 | [Prime summations](Page_2/77.go) | No 78 | [Coin partitions](Page_2/78.go) | No 79 | [Passcode derivation](Page_2/79.go) | No 80 | [Square root digital expansion](Page_2/80.go) | No 81 | [Path sum: two ways](Page_2/81.go) | No 82 | [Path sum: three ways](Page_2/82.go) | No 83 | [Path sum: four ways](Page_2/83.go) | No 84 | [Monopoly odds](Page_2/84.go) | No 85 | [Counting rectangles](Page_2/85.go) | No 86 | [Cuboid route](Page_2/86.go) | No 87 | [Prime power triples](Page_2/87.go) | No 88 | [Product-sum numbers](Page_2/88.go) | No 89 | [Roman numerals](Page_2/89.go) | No 90 | [Cube digit pairs](Page_2/90.go) | No 91 | [Right triangles with integer coordinates](Page_2/91.go) | No 92 | [Square digit chains](Page_2/92.go) | No 93 | [Arithmetic expressions](Page_2/93.go) | No 94 | [Almost equilateral triangles](Page_2/94.go) | No 95 | [Amicable chains](Page_2/95.go) | No 96 | [Su Doku](Page_2/96.go) | No 97 | [Large non-Mersenne prime](Page_2/97.go) | No 98 | [Anagramic squares](Page_2/98.go) | No 99 | [Largest exponential](Page_2/99.go) | No 100 | [Arranged probability](Page_2/100.go) | No
Page_3 ID | Title | Solved :----:|:----:|:----: 101 | [Optimum polynomial](Page_3/101.go) | No 102 | [Triangle containment](Page_3/102.go) | No 103 | [Special subset sums: optimum](Page_3/103.go) | No 104 | [Pandigital Fibonacci ends](Page_3/104.go) | No 105 | [Special subset sums: testing](Page_3/105.go) | No 106 | [Special subset sums: meta-testing](Page_3/106.go) | No 107 | [Minimal network](Page_3/107.go) | No 108 | [Diophantine reciprocals I](Page_3/108.go) | No 109 | [Darts](Page_3/109.go) | No 110 | [Diophantine reciprocals II](Page_3/110.go) | No 111 | [Primes with runs](Page_3/111.go) | No 112 | [Bouncy numbers](Page_3/112.go) | No 113 | [Non-bouncy numbers](Page_3/113.go) | No 114 | [Counting block combinations I](Page_3/114.go) | No 115 | [Counting block combinations II](Page_3/115.go) | No 116 | [Red, green or blue tiles](Page_3/116.go) | No 117 | [Red, green, and blue tiles](Page_3/117.go) | No 118 | [Pandigital prime sets](Page_3/118.go) | No 119 | [Digit power sum](Page_3/119.go) | No 120 | [Square remainders](Page_3/120.go) | No 121 | [Disc game prize fund](Page_3/121.go) | No 122 | [Efficient exponentiation](Page_3/122.go) | No 123 | [Prime square remainders](Page_3/123.go) | No 124 | [Ordered radicals](Page_3/124.go) | No 125 | [Palindromic sums](Page_3/125.go) | No 126 | [Cuboid layers](Page_3/126.go) | No 127 | [abc-hits](Page_3/127.go) | No 128 | [Hexagonal tile differences](Page_3/128.go) | No 129 | [Repunit divisibility](Page_3/129.go) | No 130 | [Composites with prime repunit property](Page_3/130.go) | No 131 | [Prime cube partnership](Page_3/131.go) | No 132 | [Large repunit factors](Page_3/132.go) | No 133 | [Repunit nonfactors](Page_3/133.go) | No 134 | [Prime pair connection](Page_3/134.go) | No 135 | [Same differences](Page_3/135.go) | No 136 | [Singleton difference](Page_3/136.go) | No 137 | [Fibonacci golden nuggets](Page_3/137.go) | No 138 | [Special isosceles triangles](Page_3/138.go) | No 139 | [Pythagorean tiles](Page_3/139.go) | No 140 | [Modified Fibonacci golden nuggets](Page_3/140.go) | No 141 | [Investigating progressive numbers, n, which are also square](Page_3/141.go) | No 142 | [Perfect Square Collection](Page_3/142.go) | No 143 | [Investigating the Torricelli point of a triangle](Page_3/143.go) | No 144 | [Investigating multiple reflections of a laser beam](Page_3/144.go) | No 145 | [How many reversible numbers are there below one-billion?](Page_3/145.go) | No 146 | [Investigating a Prime Pattern ](Page_3/146.go) | No 147 | [Rectangles in cross-hatched grids](Page_3/147.go) | No 148 | [Exploring Pascal's triangle](Page_3/148.go) | No 149 | [Searching for a maximum-sum subsequence](Page_3/149.go) | No 150 | [Searching a triangular array for a sub-triangle having minimum-sum](Page_3/150.go) | No
Page_4 ID | Title | Solved :----:|:----:|:----: 151 | [Paper sheets of standard sizes: an expected-value problem](Page_4/151.go) | No 152 | [Writing 1/2 as a sum of inverse squares](Page_4/152.go) | No 153 | [Investigating Gaussian Integers](Page_4/153.go) | No 154 | [Exploring Pascal's pyramid](Page_4/154.go) | No 155 | [Counting Capacitor Circuits](Page_4/155.go) | No 156 | [Counting Digits](Page_4/156.go) | No 157 | [Solving the diophantine equation 1/a+1/b= p/10n](Page_4/157.go) | No 158 | [Exploring strings for which only one character comes lexicographically after its neighbour to the left](Page_4/158.go) | No 159 | [Digital root sums of factorisations](Page_4/159.go) | No 160 | [Factorial trailing digits](Page_4/160.go) | No 161 | [Triominoes](Page_4/161.go) | No 162 | [Hexadecimal numbers](Page_4/162.go) | No 163 | [Cross-hatched triangles](Page_4/163.go) | No 164 | [Numbers for which no three consecutive digits have a sum greater than a given value](Page_4/164.go) | No 165 | [Intersections](Page_4/165.go) | No 166 | [Criss Cross](Page_4/166.go) | No 167 | [Investigating Ulam sequences](Page_4/167.go) | No 168 | [Number Rotations](Page_4/168.go) | No 169 | [Exploring the number of different ways a number can be expressed as a sum of powers of 2](Page_4/169.go) | No 170 | [Find the largest 0 to 9 pandigital that can be formed by concatenating products](Page_4/170.go) | No 171 | [Finding numbers for which the sum of the squares of the digits is a square](Page_4/171.go) | No 172 | [Investigating numbers with few repeated digits](Page_4/172.go) | No 173 | [Using up to one million tiles how many different "hollow" square laminae can be formed?](Page_4/173.go) | No 174 | [Counting the number of "hollow" square laminae that can form one, two, three, ... distinct arrangements](Page_4/174.go) | No 175 | [Fractions involving the number of different ways a number can be expressed as a sum of powers of 2](Page_4/175.go) | No 176 | [Right-angled triangles that share a cathetus](Page_4/176.go) | No 177 | [Integer angled Quadrilaterals](Page_4/177.go) | No 178 | [Step Numbers](Page_4/178.go) | No 179 | [Consecutive positive divisors](Page_4/179.go) | No 180 | [Rational zeros of a function of three variables](Page_4/180.go) | No 181 | [Investigating in how many ways objects of two different colours can be grouped](Page_4/181.go) | No 182 | [RSA encryption](Page_4/182.go) | No 183 | [Maximum product of parts](Page_4/183.go) | No 184 | [Triangles containing the origin](Page_4/184.go) | No 185 | [Number Mind](Page_4/185.go) | No 186 | [Connectedness of a network](Page_4/186.go) | No 187 | [Semiprimes](Page_4/187.go) | No 188 | [The hyperexponentiation of a number](Page_4/188.go) | No 189 | [Tri-colouring a triangular grid](Page_4/189.go) | No 190 | [Maximising a weighted product](Page_4/190.go) | No 191 | [Prize Strings](Page_4/191.go) | No 192 | [Best Approximations](Page_4/192.go) | No 193 | [Squarefree Numbers](Page_4/193.go) | No 194 | [Coloured Configurations](Page_4/194.go) | No 195 | [Inscribed circles of triangles with one angle of 60 degrees](Page_4/195.go) | No 196 | [Prime triplets](Page_4/196.go) | No 197 | [Investigating the behaviour of a recursively defined sequence](Page_4/197.go) | No 198 | [Ambiguous Numbers](Page_4/198.go) | No 199 | [Iterative Circle Packing](Page_4/199.go) | No 200 | [Find the 200th prime-proof sqube containing the contiguous sub-string "200"](Page_4/200.go) | No
Page_5 ID | Title | Solved :----:|:----:|:----: 201 | [Subsets with a unique sum](Page_5/201.go) | No 202 | [Laserbeam](Page_5/202.go) | No 203 | [Squarefree Binomial Coefficients](Page_5/203.go) | No 204 | [Generalised Hamming Numbers](Page_5/204.go) | No 205 | [Dice Game](Page_5/205.go) | No 206 | [Concealed Square](Page_5/206.go) | No 207 | [Integer partition equations](Page_5/207.go) | No 208 | [Robot Walks](Page_5/208.go) | No 209 | [Circular Logic](Page_5/209.go) | No 210 | [Obtuse Angled Triangles](Page_5/210.go) | No 211 | [Divisor Square Sum](Page_5/211.go) | No 212 | [Combined Volume of Cuboids](Page_5/212.go) | No 213 | [Flea Circus](Page_5/213.go) | No 214 | [Totient Chains](Page_5/214.go) | No 215 | [Crack-free Walls](Page_5/215.go) | No 216 | [Investigating the primality of numbers of the form 2n2-1](Page_5/216.go) | No 217 | [Balanced Numbers](Page_5/217.go) | No 218 | [Perfect right-angled triangles](Page_5/218.go) | No 219 | [Skew-cost coding](Page_5/219.go) | No 220 | [Heighway Dragon](Page_5/220.go) | No 221 | [Alexandrian Integers](Page_5/221.go) | No 222 | [Sphere Packing](Page_5/222.go) | No 223 | [Almost right-angled triangles I](Page_5/223.go) | No 224 | [Almost right-angled triangles II](Page_5/224.go) | No 225 | [Tribonacci non-divisors](Page_5/225.go) | No 226 | [A Scoop of Blancmange](Page_5/226.go) | No 227 | [The Chase](Page_5/227.go) | No 228 | [Minkowski Sums](Page_5/228.go) | No 229 | [Four Representations using Squares](Page_5/229.go) | No 230 | [Fibonacci Words](Page_5/230.go) | No 231 | [The prime factorisation of binomial coefficients](Page_5/231.go) | No 232 | [The Race](Page_5/232.go) | No 233 | [Lattice points on a circle](Page_5/233.go) | No 234 | [Semidivisible numbers](Page_5/234.go) | No 235 | [An Arithmetic Geometric sequence](Page_5/235.go) | No 236 | [Luxury Hampers](Page_5/236.go) | No 237 | [Tours on a 4 x n playing board](Page_5/237.go) | No 238 | [Infinite string tour](Page_5/238.go) | No 239 | [Twenty-two Foolish Primes](Page_5/239.go) | No 240 | [Top Dice](Page_5/240.go) | No 241 | [Perfection Quotients](Page_5/241.go) | No 242 | [Odd Triplets](Page_5/242.go) | No 243 | [Resilience](Page_5/243.go) | No 244 | [Sliders](Page_5/244.go) | No 245 | [Coresilience](Page_5/245.go) | No 246 | [Tangents to an ellipse](Page_5/246.go) | No 247 | [Squares under a hyperbola](Page_5/247.go) | No 248 | [Numbers for which Euler’s totient function equals 13!](Page_5/248.go) | No 249 | [Prime Subset Sums](Page_5/249.go) | No 250 | [250250](Page_5/250.go) | No
Page_6 ID | Title | Solved :----:|:----:|:----: 251 | [Cardano Triplets](Page_6/251.go) | No 252 | [Convex Holes](Page_6/252.go) | No 253 | [Tidying up](Page_6/253.go) | No 254 | [Sums of Digit Factorials](Page_6/254.go) | No 255 | [Rounded Square Roots](Page_6/255.go) | No 256 | [Tatami-Free Rooms](Page_6/256.go) | No 257 | [Angular Bisectors](Page_6/257.go) | No 258 | [A lagged Fibonacci sequence](Page_6/258.go) | No 259 | [Reachable Numbers](Page_6/259.go) | No 260 | [Stone Game](Page_6/260.go) | No 261 | [Pivotal Square Sums](Page_6/261.go) | No 262 | [Mountain Range](Page_6/262.go) | No 263 | [An engineers' dream come true](Page_6/263.go) | No 264 | [Triangle Centres](Page_6/264.go) | No 265 | [Binary Circles](Page_6/265.go) | No 266 | [Pseudo Square Root](Page_6/266.go) | No 267 | [Billionaire](Page_6/267.go) | No 268 | [Counting numbers with at least four distinct prime factors less than 100](Page_6/268.go) | No 269 | [Polynomials with at least one integer root](Page_6/269.go) | No 270 | [Cutting Squares](Page_6/270.go) | No 271 | [Modular Cubes, part 1](Page_6/271.go) | No 272 | [Modular Cubes, part 2](Page_6/272.go) | No 273 | [Sum of Squares](Page_6/273.go) | No 274 | [Divisibility Multipliers](Page_6/274.go) | No 275 | [Balanced Sculptures](Page_6/275.go) | No 276 | [Primitive Triangles](Page_6/276.go) | No 277 | [A Modified Collatz sequence](Page_6/277.go) | No 278 | [Linear Combinations of Semiprimes](Page_6/278.go) | No 279 | [Triangles with integral sides and an integral angle ](Page_6/279.go) | No 280 | [Ant and seeds](Page_6/280.go) | No 281 | [Pizza Toppings](Page_6/281.go) | No 282 | [The Ackermann function](Page_6/282.go) | No 283 | [Integer sided triangles for which the area/perimeter ratio is integral](Page_6/283.go) | No 284 | [Steady Squares](Page_6/284.go) | No 285 | [Pythagorean odds](Page_6/285.go) | No 286 | [Scoring probabilities](Page_6/286.go) | No 287 | [Quadtree encoding (a simple compression algorithm)](Page_6/287.go) | No 288 | [An enormous factorial](Page_6/288.go) | No 289 | [Eulerian Cycles](Page_6/289.go) | No 290 | [Digital Signature](Page_6/290.go) | No 291 | [Panaitopol Primes](Page_6/291.go) | No 292 | [Pythagorean Polygons](Page_6/292.go) | No 293 | [Pseudo-Fortunate Numbers](Page_6/293.go) | No 294 | [Sum of digits - experience #23](Page_6/294.go) | No 295 | [Lenticular holes](Page_6/295.go) | No 296 | [Angular Bisector and Tangent](Page_6/296.go) | No 297 | [Zeckendorf Representation](Page_6/297.go) | No 298 | [Selective Amnesia](Page_6/298.go) | No 299 | [Three similar triangles](Page_6/299.go) | No 300 | [Protein folding](Page_6/300.go) | No
Page_7 ID | Title | Solved :----:|:----:|:----: 301 | [Nim](Page_7/301.go) | No 302 | [Strong Achilles Numbers](Page_7/302.go) | No 303 | [Multiples with small digits](Page_7/303.go) | No 304 | [Primonacci](Page_7/304.go) | No 305 | [Reflexive Position](Page_7/305.go) | No 306 | [Paper-strip Game](Page_7/306.go) | No 307 | [Chip Defects](Page_7/307.go) | No 308 | [An amazing Prime-generating Automaton](Page_7/308.go) | No 309 | [Integer Ladders](Page_7/309.go) | No 310 | [Nim Square](Page_7/310.go) | No 311 | [Biclinic Integral Quadrilaterals](Page_7/311.go) | No 312 | [Cyclic paths on Sierpiński graphs](Page_7/312.go) | No 313 | [Sliding game](Page_7/313.go) | No 314 | [The Mouse on the Moon](Page_7/314.go) | No 315 | [Digital root clocks](Page_7/315.go) | No 316 | [Numbers in decimal expansions](Page_7/316.go) | No 317 | [Firecracker](Page_7/317.go) | No 318 | [2011 nines](Page_7/318.go) | No 319 | [Bounded Sequences](Page_7/319.go) | No 320 | [Factorials divisible by a huge integer](Page_7/320.go) | No 321 | [Swapping Counters](Page_7/321.go) | No 322 | [Binomial coefficients divisible by 10](Page_7/322.go) | No 323 | [Bitwise-OR operations on random integers](Page_7/323.go) | No 324 | [Building a tower](Page_7/324.go) | No 325 | [Stone Game II](Page_7/325.go) | No 326 | [Modulo Summations](Page_7/326.go) | No 327 | [Rooms of Doom](Page_7/327.go) | No 328 | [Lowest-cost Search](Page_7/328.go) | No 329 | [Prime Frog](Page_7/329.go) | No 330 | [Euler's Number](Page_7/330.go) | No 331 | [Cross flips](Page_7/331.go) | No 332 | [Spherical triangles](Page_7/332.go) | No 333 | [Special partitions](Page_7/333.go) | No 334 | [Spilling the beans](Page_7/334.go) | No 335 | [Gathering the beans](Page_7/335.go) | No 336 | [Maximix Arrangements](Page_7/336.go) | No 337 | [Totient Stairstep Sequences](Page_7/337.go) | No 338 | [Cutting Rectangular Grid Paper](Page_7/338.go) | No 339 | [Peredur fab Efrawg](Page_7/339.go) | No 340 | [Crazy Function](Page_7/340.go) | No 341 | [Golomb's self-describing sequence](Page_7/341.go) | No 342 | [The totient of a square is a cube](Page_7/342.go) | No 343 | [Fractional Sequences](Page_7/343.go) | No 344 | [Silver dollar game](Page_7/344.go) | No 345 | [Matrix Sum](Page_7/345.go) | No 346 | [Strong Repunits](Page_7/346.go) | No 347 | [Largest integer divisible by two primes](Page_7/347.go) | No 348 | [Sum of a square and a cube](Page_7/348.go) | No 349 | [Langton's ant](Page_7/349.go) | No 350 | [Constraining the least greatest and the greatest least](Page_7/350.go) | No
Page_8 ID | Title | Solved :----:|:----:|:----: 351 | [Hexagonal orchards](Page_8/351.go) | No 352 | [Blood tests](Page_8/352.go) | No 353 | [Risky moon](Page_8/353.go) | No 354 | [Distances in a bee's honeycomb ](Page_8/354.go) | No 355 | [Maximal coprime subset](Page_8/355.go) | No 356 | [Largest roots of cubic polynomials](Page_8/356.go) | No 357 | [Prime generating integers](Page_8/357.go) | No 358 | [Cyclic numbers](Page_8/358.go) | No 359 | [Hilbert's New Hotel](Page_8/359.go) | No 360 | [Scary Sphere](Page_8/360.go) | No 361 | [Subsequence of Thue-Morse sequence](Page_8/361.go) | No 362 | [Squarefree factors](Page_8/362.go) | No 363 | [Bézier Curves](Page_8/363.go) | No 364 | [Comfortable distance](Page_8/364.go) | No 365 | [A huge binomial coefficient](Page_8/365.go) | No 366 | [Stone Game III](Page_8/366.go) | No 367 | [Bozo sort](Page_8/367.go) | No 368 | [A Kempner-like series](Page_8/368.go) | No 369 | [Badugi](Page_8/369.go) | No 370 | [Geometric triangles](Page_8/370.go) | No 371 | [Licence plates](Page_8/371.go) | No 372 | [Pencils of rays](Page_8/372.go) | No 373 | [Circumscribed Circles](Page_8/373.go) | No 374 | [Maximum Integer Partition Product](Page_8/374.go) | No 375 | [Minimum of subsequences](Page_8/375.go) | No 376 | [Nontransitive sets of dice](Page_8/376.go) | No 377 | [Sum of digits, experience 13](Page_8/377.go) | No 378 | [Triangle Triples](Page_8/378.go) | No 379 | [Least common multiple count](Page_8/379.go) | No 380 | [Amazing Mazes!](Page_8/380.go) | No 381 | [(prime-k) factorial](Page_8/381.go) | No 382 | [Generating polygons](Page_8/382.go) | No 383 | [Divisibility comparison between factorials](Page_8/383.go) | No 384 | [Rudin-Shapiro sequence](Page_8/384.go) | No 385 | [Ellipses inside triangles](Page_8/385.go) | No 386 | [Maximum length of an antichain](Page_8/386.go) | No 387 | [Harshad Numbers](Page_8/387.go) | No 388 | [Distinct Lines](Page_8/388.go) | No 389 | [Platonic Dice](Page_8/389.go) | No 390 | [Triangles with non rational sides and integral area](Page_8/390.go) | No 391 | [Hopping Game](Page_8/391.go) | No 392 | [Enmeshed unit circle](Page_8/392.go) | No 393 | [Migrating ants](Page_8/393.go) | No 394 | [Eating pie](Page_8/394.go) | No 395 | [Pythagorean tree](Page_8/395.go) | No 396 | [Weak Goodstein sequence](Page_8/396.go) | No 397 | [Triangle on parabola](Page_8/397.go) | No 398 | [Cutting rope](Page_8/398.go) | No 399 | [Squarefree Fibonacci Numbers](Page_8/399.go) | No 400 | [Fibonacci tree game](Page_8/400.go) | No
Page_9 ID | Title | Solved :----:|:----:|:----: 401 | [Sum of squares of divisors](Page_9/401.go) | No 402 | [Integer-valued polynomials](Page_9/402.go) | No 403 | [Lattice points enclosed by parabola and line](Page_9/403.go) | No 404 | [Crisscross Ellipses](Page_9/404.go) | No 405 | [A rectangular tiling](Page_9/405.go) | No 406 | [Guessing Game](Page_9/406.go) | No 407 | [Idempotents](Page_9/407.go) | No 408 | [Admissible paths through a grid](Page_9/408.go) | No 409 | [Nim Extreme](Page_9/409.go) | No 410 | [Circle and tangent line](Page_9/410.go) | No 411 | [Uphill paths](Page_9/411.go) | No 412 | [Gnomon numbering](Page_9/412.go) | No 413 | [One-child Numbers](Page_9/413.go) | No 414 | [Kaprekar constant](Page_9/414.go) | No 415 | [Titanic sets](Page_9/415.go) | No 416 | [A frog's trip](Page_9/416.go) | No 417 | [Reciprocal cycles II](Page_9/417.go) | No 418 | [Factorisation triples](Page_9/418.go) | No 419 | [Look and say sequence](Page_9/419.go) | No 420 | [2x2 positive integer matrix](Page_9/420.go) | No 421 | [Prime factors of n15+1](Page_9/421.go) | No 422 | [Sequence of points on a hyperbola](Page_9/422.go) | No 423 | [Consecutive die throws](Page_9/423.go) | No 424 | [Kakuro](Page_9/424.go) | No 425 | [Prime connection](Page_9/425.go) | No 426 | [Box-ball system](Page_9/426.go) | No 427 | [n-sequences](Page_9/427.go) | No 428 | [Necklace of circles](Page_9/428.go) | No 429 | [Sum of squares of unitary divisors](Page_9/429.go) | No 430 | [Range flips](Page_9/430.go) | No 431 | [Square Space Silo](Page_9/431.go) | No 432 | [Totient sum](Page_9/432.go) | No 433 | [Steps in Euclid's algorithm](Page_9/433.go) | No 434 | [Rigid graphs](Page_9/434.go) | No 435 | [Polynomials of Fibonacci numbers](Page_9/435.go) | No 436 | [Unfair wager](Page_9/436.go) | No 437 | [Fibonacci primitive roots](Page_9/437.go) | No 438 | [Integer part of polynomial equation's solutions](Page_9/438.go) | No 439 | [Sum of sum of divisors](Page_9/439.go) | No 440 | [GCD and Tiling](Page_9/440.go) | No 441 | [The inverse summation of coprime couples](Page_9/441.go) | No 442 | [Eleven-free integers](Page_9/442.go) | No 443 | [GCD sequence](Page_9/443.go) | No 444 | [The Roundtable Lottery](Page_9/444.go) | No 445 | [Retractions A](Page_9/445.go) | No 446 | [Retractions B](Page_9/446.go) | No 447 | [Retractions C](Page_9/447.go) | No 448 | [Average least common multiple](Page_9/448.go) | No 449 | [Chocolate covered candy](Page_9/449.go) | No 450 | [Hypocycloid and Lattice points](Page_9/450.go) | No
Page_10 ID | Title | Solved :----:|:----:|:----: 451 | [Modular inverses](Page_10/451.go) | No 452 | [Long Products](Page_10/452.go) | No 453 | [Lattice Quadrilaterals](Page_10/453.go) | No 454 | [Diophantine reciprocals III](Page_10/454.go) | No 455 | [Powers With Trailing Digits](Page_10/455.go) | No 456 | [Triangles containing the origin II](Page_10/456.go) | No 457 | [A polynomial modulo the square of a prime](Page_10/457.go) | No 458 | [Permutations of Project](Page_10/458.go) | No 459 | [Flipping game](Page_10/459.go) | No 460 | [An ant on the move](Page_10/460.go) | No 461 | [Almost Pi](Page_10/461.go) | No 462 | [Permutation of 3-smooth numbers](Page_10/462.go) | No 463 | [A weird recurrence relation](Page_10/463.go) | No 464 | [Möbius function and intervals](Page_10/464.go) | No 465 | [Polar polygons](Page_10/465.go) | No 466 | [Distinct terms in a multiplication table](Page_10/466.go) | No 467 | [Superinteger](Page_10/467.go) | No 468 | [Smooth divisors of binomial coefficients](Page_10/468.go) | No 469 | [Empty chairs](Page_10/469.go) | No 470 | [Super Ramvok](Page_10/470.go) | No 471 | [Triangle inscribed in ellipse](Page_10/471.go) | No 472 | [Comfortable Distance II](Page_10/472.go) | No 473 | [Phigital number base](Page_10/473.go) | No 474 | [Last digits of divisors](Page_10/474.go) | No 475 | [Music festival](Page_10/475.go) | No 476 | [Circle Packing II](Page_10/476.go) | No 477 | [Number Sequence Game](Page_10/477.go) | No 478 | [Mixtures](Page_10/478.go) | No 479 | [Roots on the Rise](Page_10/479.go) | No 480 | [The Last Question](Page_10/480.go) | No 481 | [Chef Showdown](Page_10/481.go) | No 482 | [The incenter of a triangle](Page_10/482.go) | No 483 | [Repeated permutation](Page_10/483.go) | No 484 | [Arithmetic Derivative](Page_10/484.go) | No 485 | [Maximum number of divisors](Page_10/485.go) | No 486 | [Palindrome-containing strings](Page_10/486.go) | No 487 | [Sums of power sums](Page_10/487.go) | No 488 | [Unbalanced Nim](Page_10/488.go) | No 489 | [Common factors between two sequences](Page_10/489.go) | No 490 | [Jumping frog](Page_10/490.go) | No 491 | [Double pandigital number divisible by 11](Page_10/491.go) | No 492 | [Exploding sequence](Page_10/492.go) | No 493 | [Under The Rainbow](Page_10/493.go) | No 494 | [Collatz prefix families](Page_10/494.go) | No 495 | [Writing n as the product of k distinct positive integers](Page_10/495.go) | No 496 | [Incenter and circumcenter of triangle](Page_10/496.go) | No 497 | [Drunken Tower of Hanoi](Page_10/497.go) | No 498 | [Remainder of polynomial division](Page_10/498.go) | No 499 | [St. Petersburg Lottery](Page_10/499.go) | No 500 | [Problem 500!!!](Page_10/500.go) | No
Page_11 ID | Title | Solved :----:|:----:|:----: 501 | [Eight Divisors](Page_11/501.go) | No 502 | [Counting Castles](Page_11/502.go) | No 503 | [Compromise or persist](Page_11/503.go) | No 504 | [Square on the Inside](Page_11/504.go) | No 505 | [Bidirectional Recurrence](Page_11/505.go) | No 506 | [Clock sequence](Page_11/506.go) | No 507 | [Shortest Lattice Vector](Page_11/507.go) | No 508 | [Integers in base i-1](Page_11/508.go) | No 509 | [Divisor Nim](Page_11/509.go) | No 510 | [Tangent Circles](Page_11/510.go) | No 511 | [Sequences with nice divisibility properties](Page_11/511.go) | No 512 | [Sums of totients of powers](Page_11/512.go) | No 513 | [Integral median](Page_11/513.go) | No 514 | [Geoboard Shapes](Page_11/514.go) | No 515 | [Dissonant Numbers](Page_11/515.go) | No 516 | [5-smooth totients](Page_11/516.go) | No 517 | [A real recursion](Page_11/517.go) | No 518 | [Prime triples and geometric sequences](Page_11/518.go) | No 519 | [Tricolored Coin Fountains](Page_11/519.go) | No 520 | [Simbers](Page_11/520.go) | No 521 | [Smallest prime factor](Page_11/521.go) | No 522 | [Hilbert's Blackout](Page_11/522.go) | No 523 | [First Sort I](Page_11/523.go) | No 524 | [First Sort II](Page_11/524.go) | No 525 | [Rolling Ellipse](Page_11/525.go) | No 526 | [Largest prime factors of consecutive numbers](Page_11/526.go) | No 527 | [Randomized Binary Search](Page_11/527.go) | No 528 | [Constrained Sums](Page_11/528.go) | No 529 | [10-substrings](Page_11/529.go) | No 530 | [GCD of Divisors](Page_11/530.go) | No 531 | [Chinese leftovers](Page_11/531.go) | No 532 | [Nanobots on Geodesics](Page_11/532.go) | No 533 | [Minimum values of the Carmichael function](Page_11/533.go) | No 534 | [Weak Queens](Page_11/534.go) | No 535 | [Fractal Sequence](Page_11/535.go) | No 536 | [Modulo power identity ](Page_11/536.go) | No 537 | [Counting tuples](Page_11/537.go) | No 538 | [Maximum quadrilaterals](Page_11/538.go) | No 539 | [Odd elimination](Page_11/539.go) | No 540 | [Counting primitive Pythagorean triples](Page_11/540.go) | No 541 | [Divisibility of Harmonic Number Denominators](Page_11/541.go) | No 542 | [Geometric Progression with Maximum Sum](Page_11/542.go) | No 543 | [Prime-Sum Numbers](Page_11/543.go) | No 544 | [Chromatic Conundrum](Page_11/544.go) | No 545 | [Faulhaber's Formulas](Page_11/545.go) | No 546 | [The Floor's Revenge](Page_11/546.go) | No 547 | [Distance of random points within hollow square laminae](Page_11/547.go) | No 548 | [Gozinta Chains](Page_11/548.go) | No 549 | [Divisibility of factorials](Page_11/549.go) | No 550 | [Divisor game](Page_11/550.go) | No
Page_12 ID | Title | Solved :----:|:----:|:----: 551 | [Sum of digits sequence](Page_12/551.go) | No 552 | [Chinese leftovers II](Page_12/552.go) | No 553 | [Power sets of power sets](Page_12/553.go) | No 554 | [Centaurs on a chess board](Page_12/554.go) | No 555 | [McCarthy 91 function](Page_12/555.go) | No 556 | [Squarefree Gaussian Integers](Page_12/556.go) | No 557 | [Cutting triangles](Page_12/557.go) | No 558 | [Irrational base](Page_12/558.go) | No 559 | [Permuted Matrices](Page_12/559.go) | No 560 | [Coprime Nim](Page_12/560.go) | No 561 | [Divisor Pairs](Page_12/561.go) | No 562 | [Maximal perimeter](Page_12/562.go) | No 563 | [Robot Welders](Page_12/563.go) | No 564 | [Maximal polygons](Page_12/564.go) | No 565 | [Divisibility of sum of divisors](Page_12/565.go) | No 566 | [Cake Icing Puzzle](Page_12/566.go) | No 567 | [Reciprocal games I](Page_12/567.go) | No 568 | [Reciprocal games II](Page_12/568.go) | No 569 | [Prime Mountain Range](Page_12/569.go) | No 570 | [Snowflakes](Page_12/570.go) | No 571 | [Super Pandigital Numbers](Page_12/571.go) | No 572 | [Idempotent matrices](Page_12/572.go) | No 573 | [Unfair race](Page_12/573.go) | No 574 | [Verifying Primes](Page_12/574.go) | No 575 | [Wandering Robots](Page_12/575.go) | No 576 | [Irrational jumps](Page_12/576.go) | No 577 | [Counting hexagons](Page_12/577.go) | No 578 | [Integers with decreasing prime powers](Page_12/578.go) | No 579 | [Lattice points in lattice cubes](Page_12/579.go) | No 580 | [Squarefree Hilbert numbers](Page_12/580.go) | No 581 | [47-smooth triangular numbers](Page_12/581.go) | No 582 | [Nearly isosceles 120 degree triangles](Page_12/582.go) | No 583 | [Heron Envelopes](Page_12/583.go) | No 584 | [Birthday Problem Revisited](Page_12/584.go) | No 585 | [Nested square roots](Page_12/585.go) | No 586 | [Binary Quadratic Form](Page_12/586.go) | No 587 | [Concave triangle](Page_12/587.go) | No 588 | [Quintinomial coefficients](Page_12/588.go) | No 589 | [Poohsticks Marathon](Page_12/589.go) | No 590 | [Sets with a given Least Common Multiple](Page_12/590.go) | No 591 | [Best Approximations by Quadratic Integers](Page_12/591.go) | No 592 | [Factorial trailing digits 2](Page_12/592.go) | No 593 | [Fleeting Medians](Page_12/593.go) | No 594 | [Rhombus Tilings](Page_12/594.go) | No 595 | [Incremental Random Sort](Page_12/595.go) | No 596 | [Number of lattice points in a hyperball](Page_12/596.go) | No 597 | [Torpids](Page_12/597.go) | No 598 | [Split Divisibilities](Page_12/598.go) | No 599 | [Distinct Colourings of a Rubik's Cube](Page_12/599.go) | No 600 | [Integer sided equiangular hexagons](Page_12/600.go) | No
Page_13 ID | Title | Solved :----:|:----:|:----: 601 | [Divisibility streaks](Page_13/601.go) | No 602 | [Product of Head Counts](Page_13/602.go) | No 603 | [Substring sums of prime concatenations](Page_13/603.go) | No 604 | [Convex path in square](Page_13/604.go) | No 605 | [Pairwise Coin-Tossing Game](Page_13/605.go) | No 606 | [Gozinta Chains II](Page_13/606.go) | No 607 | [Marsh Crossing](Page_13/607.go) | No 608 | [Divisor Sums](Page_13/608.go) | No 609 | [π sequences](Page_13/609.go) | No 610 | [Roman Numerals II](Page_13/610.go) | No 611 | [Hallway of square steps](Page_13/611.go) | No 612 | [Friend numbers](Page_13/612.go) | No 613 | [Pythagorean Ant](Page_13/613.go) | No 614 | [Special partitions 2](Page_13/614.go) | No 615 | [The millionth number with at least one million prime factors](Page_13/615.go) | No 616 | [Creative numbers](Page_13/616.go) | No 617 | [Mirror Power Sequence](Page_13/617.go) | No 618 | [Numbers with a given prime factor sum](Page_13/618.go) | No