The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Farey Sequence in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 881st msbranicky 510 149 112ms 1 Jan 2024 882nd estomagordo 🇳🇱 509 125 12ms 25 Mar 2025 883rd snoozingnewt 🇨🇦 509 136 9ms 15 Oct 2025 884th dokutan 509 156 3ms 26 Oct 2024 885th snoozingnewt 🇨🇦 508 143 2,552ms 15 Oct 2025 886th msbranicky 507 116 163ms 1 Jan 2024 887th typeswitch-dev 🇵🇹 507 151 5ms 25 Jun 2024 888th alphafalfa 506 107 2ms 26 Aug 2024 889th dokutan 505 100 7ms 28 Oct 2024 890th Vaekor 505 126 12ms 28 Feb 2024 891st denkyuu1 501 127 20ms 7 Feb 2026 892nd scpchicken 🇵🇼 497 90 3ms 13 Dec 2023 893rd 4ndyJ 🇬🇧 497 128 12ms 29 Feb 2024 894th evnu 497 160 106ms 13 Oct 2025 895th msbranicky 496 142 1,025ms 6 Jan 2024 896th dokutan 495 104 1,273ms 29 Oct 2024 897th Yewzir 🇧🇪 494 101 202ms 26 Feb 2024 898th Yewzir 🇧🇪 494 112 7ms 5 Feb 2024 899th HumanoidCPU 493 129 20ms 5 Jun 2024 899th CutSandstone 493 129 11ms 19 Jul 2024 899th wh3n3v3r 🇨🇿 493 129 24ms 18 Nov 2024 899th Andrey2001 493 129 19ms 1 Feb 2026 899th tomh1012 493 129 14ms 19 Feb 2026 904th TeodorDyakov 🇧🇬 493 131 2ms 5 Jan 2026 905th snoozingnewt 🇨🇦 492 116 1,753ms 15 Oct 2025 906th tomh1012 492 149 471ms 6 hours ago 907th MeWhenI 🇻🇦 490 89 113ms 1 Dec 2023 908th addmai 489 130 20ms 30 Jul 2025 908th Googolplexo 🇷🇺 489 130 19ms 22 hours ago 910th dokutan 488 111 2ms 28 Apr 2025 911th HumanoidCPU 488 126 477ms 5 Jun 2024 912th HumanEquivalentUnit 488 133 14ms 5 Dec 2023 913th bjornmartensson 486 131 80ms 11 Dec 2023 913th Mabeloid 🇳🇴 486 131 20ms 11 Sep 2024 915th snoozingnewt 🇨🇦 484 112 1ms 15 Oct 2025 916th msbranicky 483 130 2ms 2 Jan 2024 916th prestosilver 🇺🇸 483 130 130ms 3 Feb 2026 918th michelebastione 🇮🇹 482 132 24ms 23 Dec 2023 918th CatsAreFluffy 482 132 28ms 31 Jan 2024 918th FranklinJiaChen 482 132 26ms 4 Aug 2024 921st msbranicky 482 134 2ms 2 Jan 2024 922nd madeforlosers 479 113 2ms 8 Dec 2023 923rd solisolu 478 133 11ms 5 Dec 2025 924th dokutan 478 140 40ms 29 Oct 2024 925th snoozingnewt 🇨🇦 475 167 3ms 15 Oct 2025 926th MaxCastella 🇫🇷 473 89 830ms 1 Dec 2023 927th CatsAreFluffy 473 130 459ms 31 Jan 2024 928th dokutan 473 149 1,026ms 30 Nov 2025 929th snoozingnewt 🇨🇦 473 184 6ms 15 Oct 2025 930th KatieLG 🇬🇧 472 109 1,268ms 2 Jan 2024 931st dokutan 472 161 125ms 1 Feb 2026 932nd 40fied4t 471 135 12ms 23 Jan 2026 933rd RockOfStone 470 140 4ms 23 Mar 2024 934th msbranicky 469 118 5ms 2 Jan 2024 934th dokutan 469 118 5ms 10 Apr 2025 936th trinityy-7 469 123 25ms 6 Dec 2023 937th Mabeloid 🇳🇴 469 131 580ms 17 Sep 2024 938th Feniske 🇫🇷 468 90 293ms 1 Dec 2023 939th kevinnaviapaiva 468 136 11ms 24 hours ago 940th dokutan 467 135 1,297ms 31 Mar 2025 941st dokutan 466 126 158ms 26 Oct 2024 942nd HumanoidCPU 466 132 93ms 5 Jun 2024 943rd Andrey2001 465 132 501ms 1 Feb 2026 944th msbranicky 465 144 39ms 2 Jan 2024 945th f-tucker 464 137 33ms 24 May 2024 945th Jaydosu 464 137 14ms 26 Jun 2024 945th mbittner20 464 137 21ms 13 Apr 2025 948th AsbestosSniffer 464 184 1,445ms 1 Dec 2023 949th cmkb3 463 91 295ms 1 Dec 2023 950th msbranicky 463 111 1,271ms 2 Jan 2024 951st msbranicky 463 117 2ms 6 Jan 2024 952nd CatsAreFluffy 462 140 4ms 31 Jan 2024 953rd snoozingnewt 🇨🇦 462 145 38ms 15 Oct 2025 954th Emutis 🇱🇹 461 138 17ms 4 Aug 2025 955th msbranicky 461 159 404ms 2 Jan 2024 956th Liibe 456 166 385ms 2 Oct 2025 957th pedro-a-soares 455 127 13ms 6 Dec 2023 958th snoozingnewt 🇨🇦 454 92 33ms 15 Oct 2025 959th AtengChen 454 140 13ms 14 Aug 2024 960th snoozingnewt 🇨🇦 454 158 26ms 15 Oct 2025 First Prev 881–960 of 1,545 Next Last