The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 estomagordo 🇳🇱 509 125 12ms 25 Mar 2025 882nd snoozingnewt 🇨🇦 509 136 9ms 15 Oct 2025 883rd dokutan 509 156 3ms 26 Oct 2024 884th snoozingnewt 🇨🇦 508 143 2,552ms 15 Oct 2025 885th msbranicky 507 116 163ms 1 Jan 2024 886th typeswitch-dev 🇵🇹 507 151 5ms 25 Jun 2024 887th alphafalfa 506 107 2ms 26 Aug 2024 888th dokutan 505 100 7ms 28 Oct 2024 889th Vaekor 505 126 12ms 28 Feb 2024 890th denkyuu1 501 127 20ms 7 Feb 2026 891st scpchicken 🇵🇼 497 90 3ms 13 Dec 2023 892nd 4ndyJ 🇬🇧 497 128 12ms 29 Feb 2024 893rd evnu 497 160 106ms 13 Oct 2025 894th msbranicky 496 142 1,025ms 6 Jan 2024 895th dokutan 495 104 1,273ms 29 Oct 2024 896th Yewzir 🇧🇪 494 101 202ms 26 Feb 2024 897th Yewzir 🇧🇪 494 112 7ms 5 Feb 2024 898th HumanoidCPU 493 129 20ms 5 Jun 2024 898th CutSandstone 493 129 11ms 19 Jul 2024 898th wh3n3v3r 🇨🇿 493 129 24ms 18 Nov 2024 898th Andrey2001 493 129 19ms 1 Feb 2026 898th tomh1012 493 129 14ms 19 Feb 2026 903rd TeodorDyakov 🇧🇬 493 131 2ms 5 Jan 2026 904th snoozingnewt 🇨🇦 492 116 1,753ms 15 Oct 2025 905th MeWhenI 🇻🇦 490 89 113ms 1 Dec 2023 906th addmai 489 130 20ms 30 Jul 2025 906th Googolplexo 🇷🇺 489 130 19ms 3 hours ago 908th dokutan 488 111 2ms 28 Apr 2025 909th HumanoidCPU 488 126 477ms 5 Jun 2024 910th HumanEquivalentUnit 488 133 14ms 5 Dec 2023 911th bjornmartensson 486 131 80ms 11 Dec 2023 911th Mabeloid 🇳🇴 486 131 20ms 11 Sep 2024 913th snoozingnewt 🇨🇦 484 112 1ms 15 Oct 2025 914th msbranicky 483 130 2ms 2 Jan 2024 914th prestosilver 🇺🇸 483 130 125ms 3 Feb 2026 916th michelebastione 🇮🇹 482 132 24ms 23 Dec 2023 916th CatsAreFluffy 482 132 28ms 31 Jan 2024 916th FranklinJiaChen 482 132 26ms 4 Aug 2024 919th msbranicky 482 134 2ms 2 Jan 2024 920th tomh1012 482 152 443ms 12 Nov 2025 921st madeforlosers 479 113 2ms 8 Dec 2023 922nd solisolu 478 133 11ms 5 Dec 2025 923rd dokutan 478 140 40ms 29 Oct 2024 924th snoozingnewt 🇨🇦 475 167 3ms 15 Oct 2025 925th MaxCastella 🇫🇷 473 89 830ms 1 Dec 2023 926th CatsAreFluffy 473 130 459ms 31 Jan 2024 927th dokutan 473 149 1,026ms 30 Nov 2025 928th snoozingnewt 🇨🇦 473 184 6ms 15 Oct 2025 929th KatieLG 🇬🇧 472 109 1,268ms 2 Jan 2024 930th dokutan 472 161 125ms 1 Feb 2026 931st 40fied4t 471 135 12ms 23 Jan 2026 932nd RockOfStone 470 140 4ms 23 Mar 2024 933rd msbranicky 469 118 5ms 2 Jan 2024 933rd dokutan 469 118 5ms 10 Apr 2025 935th trinityy-7 469 123 25ms 6 Dec 2023 936th Mabeloid 🇳🇴 469 131 580ms 17 Sep 2024 937th Feniske 🇫🇷 468 90 293ms 1 Dec 2023 938th kevinnaviapaiva 468 136 11ms 4 hours ago 939th dokutan 467 135 1,297ms 31 Mar 2025 940th dokutan 466 126 158ms 26 Oct 2024 941st HumanoidCPU 466 132 93ms 5 Jun 2024 942nd Andrey2001 465 132 501ms 1 Feb 2026 943rd msbranicky 465 144 39ms 2 Jan 2024 944th f-tucker 464 137 33ms 24 May 2024 944th Jaydosu 464 137 14ms 26 Jun 2024 944th mbittner20 464 137 21ms 13 Apr 2025 947th AsbestosSniffer 464 184 1,445ms 1 Dec 2023 948th cmkb3 463 91 295ms 1 Dec 2023 949th msbranicky 463 111 1,271ms 2 Jan 2024 950th msbranicky 463 117 2ms 6 Jan 2024 951st CatsAreFluffy 462 140 4ms 31 Jan 2024 952nd snoozingnewt 🇨🇦 462 145 38ms 15 Oct 2025 953rd Emutis 🇱🇹 461 138 17ms 4 Aug 2025 954th msbranicky 461 159 404ms 2 Jan 2024 955th Liibe 456 166 385ms 2 Oct 2025 956th pedro-a-soares 455 127 13ms 6 Dec 2023 957th snoozingnewt 🇨🇦 454 92 33ms 15 Oct 2025 958th AtengChen 454 140 13ms 14 Aug 2024 959th snoozingnewt 🇨🇦 454 158 26ms 15 Oct 2025 960th dokutan 453 165 4ms 14 Feb 2026 First Prev 881–960 of 1,543 Next Last