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 481st sambirnbaum1 534 116 11ms 7 Sep 2019 481st markus-rekdal 534 116 18ms 23 May 2022 481st rowboat1 534 116 10ms 21 Jun 2022 481st AGoyet 534 116 42ms 29 Jun 2022 485th madeforlosers 530 117 16ms 7 Nov 2025 486th caerbannogwhite 525 118 16ms 13 Apr 2018 486th danwley 525 118 10ms 2 Apr 2019 486th siegelzero 525 118 15ms 24 Jan 2020 486th mothcolada 🇺🇸 525 118 11ms 4 Dec 2020 486th lukehatcher 🇺🇸 525 118 18ms 30 Aug 2021 486th P-Quentin 🇫🇷 525 118 29ms 10 Aug 2022 486th midnattssol 🇸🇪 525 118 12ms 27 Jul 2023 486th JesseNoEyes 🇺🇸 525 118 10ms 25 Sep 2024 494th dddthedark 521 119 9ms 11 Jan 2018 494th raywinray 521 119 10ms 27 Sep 2018 494th alangodfrey 521 119 11ms 11 Jun 2019 494th ElevatorShaft 521 119 9ms 18 Jun 2019 494th iso4096 521 119 9ms 8 Mar 2020 494th Andre3582 521 119 10ms 25 Oct 2020 494th enbyte 521 119 9ms 27 May 2021 494th Hannah-Varekamp 521 119 10ms 17 Jun 2021 494th StarmaQ 521 119 9ms 12 Jan 2022 494th Trunksistor 🇫🇷 521 119 17ms 19 Apr 2022 494th Puperger 521 119 9ms 19 Jun 2022 494th jhpaques 🇫🇷 521 119 9ms 29 Jul 2022 494th kevdah 521 119 9ms 2 Aug 2022 494th bwenstar 521 119 9ms 9 Aug 2022 494th mdnestor 521 119 9ms 28 Dec 2022 494th mbittner20 521 119 11ms 27 May 2023 494th HumanoidCPU 521 119 9ms 3 May 2024 494th therealnumbers 521 119 10ms 4 Jun 2024 494th RedzGoose 🇦🇺 521 119 9ms 25 Oct 2024 494th mishak-sys 521 119 9ms 31 Mar 2025 494th damoose717 521 119 11ms 23 May 2025 494th WillowWispy 521 119 17ms 25 May 2025 494th averagepythondev 521 119 9ms 2 Jan 2026 517th jaredcrystal 🇺🇸 517 120 17ms 17 Mar 2018 517th BenBanerjeeRichards 517 120 10ms 20 Jan 2022 519th johnnythedoggie 512 121 23ms 26 Apr 2021 519th bac0id 512 121 10ms 27 Sep 2023 519th brimstonetrader 512 121 10ms 22 Jan 2024 522nd babakoban 508 122 9ms 30 Aug 2019 522nd AreYouW 508 122 10ms 6 Dec 2019 522nd Hawkeye99 508 122 9ms 6 Dec 2019 522nd ADV1K 🇮🇳 508 122 9ms 18 Feb 2020 522nd garrisonhh 508 122 16ms 21 Nov 2020 522nd Command-Crafter 508 122 10ms 8 Nov 2021 522nd lovernj 508 122 10ms 7 Feb 2022 522nd Demonarchet 508 122 10ms 2 May 2023 522nd Deedogg 508 122 18ms 5 Sep 2024 522nd 0dyse 508 122 11ms 29 Apr 2025 522nd osNiko 🇧🇷 508 122 11ms 23 Jul 2025 533rd lukasmoellerch 504 123 11ms 14 Jan 2019 533rd Kreavita 504 123 11ms 14 Jan 2019 533rd timkaiser 504 123 11ms 19 Apr 2019 533rd bobbysq 504 123 11ms 29 Jun 2023 537th KarachunIvan 500 124 11ms 19 Feb 2018 537th sleepyStick 500 124 16ms 11 Mar 2022 537th Apfelvater 500 124 17ms 26 days ago 540th lmeuser 496 125 11ms 2 Dec 2017 540th 0xCake 496 125 17ms 20 Apr 2020 540th haydenridd 496 125 9ms 20 Oct 2020 540th markbyrne 496 125 10ms 20 Oct 2020 540th samchristiandd 496 125 11ms 19 Feb 2021 540th clementblaudeau 496 125 9ms 26 May 2021 540th brochmann 🇸🇪 496 125 9ms 6 Feb 2022 540th AliceFord 496 125 9ms 2 Jun 2022 540th elephantpanda 496 125 10ms 31 Aug 2022 540th Azearia 496 125 10ms 1 Dec 2022 540th Schreipfelerer 496 125 10ms 9 Apr 2023 540th eddvrs 496 125 10ms 21 Dec 2023 540th qwjhvbxi 496 125 12ms 8 Feb 2024 540th Pale-Vessel 496 125 10ms 1 Apr 2024 540th hippopotam00sehead 🇨🇦 496 125 10ms 13 Sep 2024 540th TralfamadorianComedian 496 125 10ms 31 Dec 2024 540th TheZwierzLF 🇵🇱 496 125 32ms 25 May 2025 557th jackedwards04 492 126 9ms 22 Nov 2020 557th b4dpxl 492 126 16ms 10 Nov 2021 557th jettdc 492 126 10ms 31 Dec 2022 557th jstechman 492 126 10ms 9 Mar 2024 First Prev 481–560 of 712 Next Last
