The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Pernicious Numbers in Python 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 559th chenyuan33 388 103 10ms 21 Feb 2026 562nd S-Ruban 385 104 10ms 25 Feb 2023 563rd bkshrader 381 105 10ms 29 Dec 2018 563rd danwley 381 105 10ms 5 Jan 2019 563rd rpuneet 381 105 10ms 27 Sep 2019 563rd Pena86 381 105 16ms 18 Feb 2021 567th TetroVolt 377 106 10ms 10 Sep 2018 567th hymanimy 377 106 9ms 6 Jun 2021 567th VV1Git 377 106 17ms 28 Mar 2023 570th CuboidRaptor 🇨🇦 374 107 9ms 19 Jan 2022 570th Feniske 🇫🇷 374 107 9ms 7 Oct 2022 570th tknight00 374 107 17ms 5 Mar 2024 570th HanaEndUser 374 107 15ms 5 Mar 2024 574th lovernj 370 108 10ms 31 Jan 2022 574th cingulataluke 370 108 9ms 29 Aug 2023 574th yuchuehw 370 108 9ms 3 Jan 2024 577th KiwiKoder0123 367 109 9ms 23 Jun 2019 577th MiranDaniel 🇨🇿 367 109 10ms 29 Apr 2023 577th clayboll99 367 109 10ms 14 Jul 2025 580th Bananapants22 364 110 10ms 15 Aug 2022 581st evanrittner 360 111 9ms 5 Jun 2021 581st BabySharkHi 360 111 16ms 22 Apr 2025 583rd ElevatorShaft 357 112 10ms 18 Jun 2019 583rd VictorFordham 357 112 10ms 9 Aug 2020 583rd inishawl 357 112 9ms 16 Jun 2021 583rd theunofficialcoder 357 112 9ms 2 Aug 2021 583rd bwat2 357 112 10ms 6 Nov 2021 583rd bwenstar 357 112 9ms 9 Aug 2022 583rd Pyro569 357 112 10ms 30 Jul 2023 583rd kevdah 357 112 9ms 2 Oct 2023 583rd TralfamadorianComedian 357 112 10ms 31 Dec 2024 592nd wilkij1 354 113 10ms 16 Jun 2018 592nd leon-w 354 113 11ms 27 Feb 2020 592nd vonKrafft 354 113 10ms 25 Mar 2020 592nd qwjhvbxi 354 113 10ms 7 Feb 2024 592nd 123mjb 354 113 10ms 19 Nov 2025 597th mvrkws 351 114 11ms 5 Dec 2018 597th devRND-ess 351 114 9ms 29 Apr 2020 597th hamilton-bonds 351 114 9ms 24 Jul 2025 600th sleepyStick 348 115 10ms 2 Dec 2021 601st DaleNaci 345 116 9ms 27 Aug 2018 601st MariuszPienkosz 345 116 10ms 21 May 2020 601st SURAJMITTAL 345 116 9ms 20 Dec 2024 604th SimonPeatman 342 117 16ms 3 Feb 2019 604th odelo 342 117 10ms 26 Oct 2023 604th DGipe 342 117 10ms 2 Jul 2024 604th davidludwik2370 342 117 10ms 17 Sep 2025 604th robbertvz 342 117 10ms 29 Dec 2025 609th BrenSchaap 339 118 9ms 20 Oct 2021 609th GeneralTwi 339 118 9ms 2 May 2022 609th Azearia 339 118 9ms 27 Oct 2023 609th ComputerKWasTaken 🇺🇸 339 118 16ms 1 Jun 2024 613th fepe55 333 120 10ms 11 Oct 2018 613th azure-blondon 333 120 9ms 14 Dec 2023 615th sli-Lut 331 121 10ms 26 Oct 2023 616th nmgetahun 328 122 10ms 9 Dec 2022 616th TheLazySquid 328 122 9ms 21 Dec 2022 618th jlevis10 325 123 9ms 26 Oct 2023 618th GolfGPT 325 123 15ms 19 Nov 2023 620th ian-h-chamberlain 🇺🇸 323 124 9ms 27 Dec 2019 621st zuparnowa 320 125 17ms 25 Jan 2019 621st henrytranter 320 125 15ms 20 Sep 2019 621st itljan30 320 125 10ms 2 Sep 2024 624th j21marshall 317 126 10ms 7 Aug 2020 624th goGuru 317 126 9ms 21 Dec 2022 624th EnisEfe0 317 126 10ms 18 May 2025 627th usnheckler 315 127 20ms 8 Jun 2019 628th dylanjones92 294 136 9ms 25 Jan 2024 629th SnehanjanChatterjee 282 142 9ms 20 Dec 2018 629th KatieLG-Transpiler 🇬🇧 282 142 9ms 23 Jun 2022 629th zt14427 282 142 9ms 12 Aug 2023 632nd breeezi 280 143 10ms 7 Feb 2020 632nd eddvrs 280 143 16ms 22 Dec 2023 632nd alfonsoalves 280 143 10ms 27 Feb 2024 635th dddthedark 265 151 10ms 14 Mar 2018 635th PYRiTEmonark 265 151 9ms 22 May 2021 637th hardlyBearable 261 153 9ms 20 May 2019 637th janga1 261 153 9ms 17 Aug 2021 639th dcure73 256 156 11ms 7 Jun 2019 640th markbyrne 250 160 9ms 26 Oct 2020 First Prev 561–640 of 663 Next Last
