The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Happy 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 561st usnheckler 488 127 64ms 7 Jun 2019 561st derekthatcher 488 127 16ms 25 Sep 2020 561st bastienvoirin 🇫🇷 488 127 18ms 28 Nov 2020 561st Evan-Robotics 488 127 16ms 26 Jan 2022 561st gareth-kmet 488 127 16ms 2 Mar 2023 566th petar-donchev 484 128 11ms 8 Sep 2019 566th shibacho 🇯🇵 484 128 18ms 25 Nov 2022 566th EthanJantz 484 128 17ms 27 Aug 2025 569th ChristianFieldhouse 481 129 10ms 22 Mar 2021 570th richard-oelze 🇩🇪 477 130 17ms 28 Feb 2021 570th yokasuretsu 477 130 11ms 28 Nov 2021 570th andrewgopher 477 130 11ms 27 Jun 2022 570th LukasFolwarczny 🇨🇿 477 130 18ms 16 Sep 2022 570th ellis-rix 477 130 11ms 27 Jan 2023 570th Coding4Hours 477 130 16ms 4 Oct 2024 570th IsaacAlexBarden 477 130 12ms 13 Feb 2025 577th ozewski 473 131 72ms 2 May 2019 577th guliyevemil1 🇦🇿 473 131 10ms 18 Apr 2020 577th Gordo5556 473 131 10ms 29 Apr 2022 580th theonlytruemathnerd 470 132 17ms 11 Jan 2020 580th JuanGomez12 470 132 10ms 2 Feb 2023 580th aszku 470 132 10ms 20 Apr 2023 580th strogor 470 132 11ms 9 Jun 2025 584th Manby 466 133 11ms 30 Jun 2021 584th byteDJINN 466 133 17ms 16 Jan 2024 584th FusionAtom360 466 133 18ms 4 Jan 2026 587th patbassing 463 134 11ms 26 May 2019 587th Nibamot 463 134 10ms 19 Feb 2020 587th aagray33 463 134 10ms 28 Feb 2020 587th Techdude01 463 134 16ms 17 Dec 2022 587th julian-hoelz 463 134 10ms 15 Sep 2024 592nd bkshrader 459 135 17ms 27 Dec 2018 592nd reubengann 459 135 10ms 14 Feb 2020 592nd DGipe 459 135 11ms 22 Oct 2025 595th smartiel 456 136 11ms 15 Sep 2022 595th ComputerKWasTaken 🇺🇸 456 136 17ms 8 Jun 2024 597th DrPrettyman 453 137 11ms 1 Jun 2023 598th adamhass 449 138 11ms 19 Jul 2018 598th zwxzwxzwx21 449 138 10ms 5 Nov 2023 598th mrmena 🇦🇺 449 138 17ms 16 Apr 2024 601st jmhowl 446 139 17ms 19 Jan 2020 601st mokymok 🇺🇸 446 139 17ms 29 Dec 2021 601st lightediand 🇬🇧 446 139 11ms 18 Jan 2023 601st CyberTapir 446 139 11ms 1 Sep 2024 601st Wonamm 446 139 12ms 14 Feb 2025 601st TJK-S 446 139 10ms 22 Oct 2025 607th mcdowell95 443 140 10ms 26 Mar 2020 607th osmith93 443 140 11ms 31 Jul 2021 607th 104210 443 140 10ms 11 May 2022 610th Pierrot-Baptiste 440 141 11ms 9 Aug 2020 610th dranjohn 440 141 9ms 10 Sep 2023 610th SURAJMITTAL 440 141 11ms 20 Dec 2024 613th ChristophJud 437 142 10ms 11 Aug 2020 613th ESOrSomething 437 142 11ms 29 Sep 2025 615th RoscoeSmith 434 143 11ms 14 Sep 2022 616th SimonPeatman 431 144 17ms 2 Feb 2019 616th pde-bakk 🇳🇱 431 144 11ms 23 Oct 2023 618th CRHillman 428 145 17ms 17 Aug 2018 618th ethandhunt 428 145 10ms 29 Jul 2021 620th KiwiKoder0123 425 146 11ms 24 Jun 2019 620th KatieLG-Transpiler 🇬🇧 425 146 9ms 23 Jun 2022 620th twocatsinatrenchcoat 425 146 9ms 18 Nov 2022 620th fraserli 🇦🇺 425 146 16ms 17 Feb 2023 620th zt14427 425 146 10ms 4 Mar 2023 620th Schmitt-Very-Cool 425 146 11ms 3 Apr 2024 626th potato-jackson 422 147 17ms 10 Sep 2021 626th Florian-Mt 422 147 18ms 26 Sep 2023 628th Mojken 419 148 19ms 2 Sep 2018 628th NoneTheFewer 419 148 16ms 25 Dec 2025 630th snickercop 416 149 11ms 6 Aug 2019 630th cingulataluke 416 149 11ms 28 Aug 2023 632nd ionutm82 413 150 10ms 22 Feb 2019 633rd dahrens 411 151 11ms 7 Jul 2019 634th fepe55 408 152 9ms 21 Sep 2018 635th ari-gutierrez 400 155 33ms 22 Oct 2018 636th Spi3lot 395 157 9ms 18 Sep 2021 636th MarioPlq 395 157 10ms 24 Jun 2022 636th OppositeShark 395 157 11ms 19 Jul 2022 639th ridingqwerty 🇺🇸 392 158 11ms 6 Dec 2023 639th j3mak 392 158 11ms 16 Jan 2024 First Prev 561–640 of 712 Next Last
