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 399th feherd 596 104 15ms 30 Aug 2021 399th amollberg 🇸🇪 596 104 18ms 29 Jan 2022 399th no53488 596 104 10ms 5 Dec 2022 399th Wildst 596 104 10ms 7 Jul 2023 399th FCORMERAIS 596 104 12ms 7 Mar 2024 406th lrustand 590 105 11ms 15 Jan 2018 406th djtuBIG-MaliceX 590 105 17ms 30 Jan 2018 406th Faweks1 590 105 16ms 1 Aug 2018 406th SupImDos 590 105 9ms 10 Nov 2020 406th dillon-duncando 590 105 18ms 1 Dec 2021 406th Ch3ngL0rd 590 105 12ms 16 Jan 2024 406th jamesthekee 590 105 11ms 25 Jan 2025 406th kistlerf 🇨🇭 590 105 16ms 16 May 2025 414th dave-ck 585 106 10ms 3 Mar 2018 414th RyanCarrusca 585 106 10ms 21 Feb 2019 414th oriphi 585 106 56ms 17 Jun 2019 414th evanrittner 585 106 16ms 12 Jan 2020 414th oAsAo 585 106 30ms 21 Jan 2020 414th hymanimy 585 106 17ms 11 Aug 2021 414th eshilo-draper 585 106 16ms 18 Nov 2022 414th ZoeMcG 585 106 10ms 8 Jan 2023 414th mathisfun271 585 106 92ms 13 Feb 2024 414th Ythaenagor 585 106 17ms 5 Aug 2024 424th stordev 579 107 16ms 26 Feb 2021 424th KrausRaus 🇺🇸 579 107 10ms 15 Apr 2021 424th petroselo 579 107 17ms 29 Dec 2021 424th jumelet 🇳🇱 579 107 17ms 13 Dec 2022 424th jameswmccarty 579 107 17ms 11 Jul 2024 424th PyryL 🇫🇮 579 107 19ms 15 Mar 2025 424th kbeat 🇰🇿 579 107 17ms 21 May 2025 431st 05st 574 108 16ms 14 Feb 2022 431st CameronGBell 574 108 10ms 7 Mar 2022 431st SniperSmiley 🇺🇸 574 108 16ms 29 Jun 2022 431st dtaylor0 574 108 17ms 25 Dec 2022 431st sultan 574 108 10ms 2 Apr 2024 431st jfallon1997 574 108 18ms 16 May 2024 431st 40fied4t 574 108 9ms 21 May 2025 438th tkwa 569 109 17ms 5 Dec 2018 438th Bodo171 569 109 15ms 24 Nov 2022 438th DaCuteRaccoon 569 109 10ms 30 Nov 2022 438th jagannathhari 569 109 17ms 21 Oct 2023 438th ian-h-chamberlain 🇺🇸 569 109 17ms 16 Oct 2025 443rd ValNyz 564 110 22ms 20 Apr 2018 443rd hyvyys 564 110 10ms 16 Sep 2020 443rd vodker1 564 110 17ms 8 Mar 2022 443rd berdzi 564 110 11ms 15 Mar 2022 443rd VictorFordham 564 110 16ms 12 Oct 2023 443rd NanduBC 564 110 18ms 7 Sep 2024 449th ArturLange 559 111 11ms 5 Sep 2018 449th adesanjo 559 111 17ms 8 Jun 2019 449th vonKrafft 559 111 10ms 26 Mar 2020 449th TinyTheBrontosaurus 559 111 10ms 4 Dec 2023 449th Artemis21 🇬🇧 559 111 17ms 2 Jan 2025 449th 123mjb 559 111 11ms 26 Jun 2025 449th tomh1012 559 111 11ms 5 Feb 2026 449th zgialor-lab 559 111 12ms 18 days ago 457th boxjelly 554 112 11ms 10 Jan 2021 457th Pena86 554 112 11ms 18 Feb 2021 457th Kasci 554 112 80ms 28 Dec 2021 457th Omega65536 🇩🇪 554 112 10ms 29 Nov 2022 457th epic-programmer-guy 554 112 15ms 26 Dec 2023 462nd nkansal96 549 113 17ms 21 May 2019 462nd TobyBoyne 🇬🇧 549 113 16ms 1 Jun 2019 462nd dymowski 549 113 18ms 24 Jul 2019 462nd weberax 549 113 9ms 30 Nov 2019 462nd AIn0n 549 113 18ms 15 Jul 2021 462nd super-tux 549 113 66ms 9 Aug 2021 462nd olavaga 549 113 11ms 13 Aug 2021 462nd nkoppel 549 113 11ms 20 Oct 2022 462nd Skwerl23 549 113 18ms 3 Feb 2023 462nd Mikey-Beep 🇬🇧 549 113 12ms 24 Aug 2023 462nd bropal404 🇮🇳 549 113 600ms 6 Mar 2025 473rd kenny14231 544 114 10ms 6 Aug 2022 473rd aalec 544 114 111ms 24 Apr 2024 473rd ApoChagi 544 114 18ms 25 Oct 2025 476th michelebastione 🇮🇹 539 115 12ms 19 Nov 2019 476th artieleach 539 115 18ms 12 Dec 2020 476th ktanaka 539 115 10ms 11 Jan 2024 476th clayboll99 539 115 10ms 11 Jul 2025 476th arjunarya1 539 115 11ms 28 Aug 2025 First Prev 401–480 of 712 Next Last
