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?
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 67th ydevor 🇮🇱 912 68 10ms 26 Nov 2020 67th anter69 🇭🇺 912 68 10ms 14 Jan 2021 67th HETHAT 🇩🇿 912 68 10ms 31 Jan 2021 67th vezzick 912 68 9ms 7 Mar 2021 67th Indivicivet 912 68 9ms 26 Mar 2021 67th emplv 🇱🇻 912 68 9ms 31 Aug 2021 67th MichaelMBradley 🇨🇦 912 68 10ms 11 Jun 2022 67th janbehrens 🇩🇪 912 68 10ms 4 Jul 2022 67th betaveros 912 68 9ms 9 Aug 2022 67th 5quiwyrm 912 68 10ms 20 Aug 2022 67th PowerR0 912 68 9ms 25 Aug 2022 67th ItsMeNoobieboy 912 68 9ms 21 Dec 2022 67th scpchicken 🇵🇼 912 68 9ms 28 Jan 2023 67th CheeseCake628 🇳🇴 912 68 16ms 16 Feb 2023 67th Just4FunCoder 912 68 10ms 22 Mar 2023 67th fourth-bit 912 68 9ms 11 Jul 2023 67th RYNO8 912 68 9ms 22 Aug 2023 67th Yewzir 🇧🇪 912 68 9ms 6 Oct 2023 67th keelimeguy 🇺🇸 912 68 17ms 19 Oct 2023 67th 1231234md5 🇨🇳 912 68 10ms 13 Dec 2023 67th stackofbears 912 68 9ms 27 Dec 2023 67th CutSandstone 912 68 10ms 5 Jul 2024 67th Bulmenisaurus 912 68 9ms 17 Jul 2024 67th codingisgreatbutiamnot 912 68 16ms 12 Aug 2024 67th Troon 912 68 10ms 11 Feb 2025 67th plcc0 912 68 11ms 20 Feb 2025 67th albanian-laundromat 912 68 9ms 30 Jun 2025 67th SanderRuud 912 68 9ms 13 Jul 2025 67th qpwoeirut 912 68 10ms 1 Oct 2025 67th countlpaul-dotcom 912 68 9ms 19 Oct 2025 67th SectorCorruptor 912 68 10ms 8 Feb 2026 112th benwilliamgraham 899 69 10ms 26 Jan 2019 112th OllieBoyne 🇬🇧 899 69 9ms 16 Jan 2021 112th eiburns 899 69 10ms 20 Jan 2022 112th vishwathg 899 69 9ms 16 Aug 2022 112th emirps 899 69 9ms 22 Feb 2023 112th Vaekor 899 69 9ms 9 Jul 2023 112th AVDestroyer 899 69 10ms 4 Sep 2023 112th m42km 899 69 9ms 7 Oct 2023 112th elgan65536 🇺🇸 899 69 9ms 4 Apr 2024 112th JOrE20 899 69 9ms 25 Feb 2026 122nd ArmaanAS 886 70 10ms 8 Mar 2021 122nd Hebelub 886 70 9ms 5 Jan 2024 122nd Dataen 886 70 10ms 5 Jan 2024 125th Frowny 861 72 9ms 3 Jul 2020 125th lifthrasiir 🇰🇷 861 72 10ms 13 Nov 2024 127th mogron 849 73 10ms 13 Dec 2019 127th FlorianCassayre 🇫🇷 849 73 9ms 30 Oct 2022 127th StefanHabel 🇨🇦 849 73 9ms 11 Dec 2022 127th DrakeSeteraO 849 73 10ms 25 Oct 2025 131st KatieLG 🇬🇧 838 74 16ms 5 Nov 2020 131st trist224 🇫🇷 838 74 9ms 15 Nov 2022 131st QuincyNash 🇺🇸 838 74 9ms 29 Nov 2022 134th mortimervonchappuis 827 75 10ms 17 Mar 2020 134th SirFireball3521 827 75 10ms 28 Jan 2023 134th AlexanderFair 827 75 10ms 2 Jul 2023 134th msbranicky 827 75 10ms 25 Jul 2023 138th cbondurant 816 76 9ms 10 May 2021 138th bob-th 816 76 41ms 24 Jan 2023 140th ahmetdemirag 🇨🇾 805 77 64ms 11 Feb 2025 141st Waffle3z 795 78 9ms 9 Jul 2021 141st snydej 795 78 32ms 22 Nov 2024 141st InigoK 🇺🇸 795 78 36ms 5 Sep 2025 141st CommandLeo 🇮🇹 795 78 46ms 23 Dec 2025 145th Eilonlif 🇮🇱 785 79 75ms 20 Feb 2023 145th fkantelberg 785 79 11ms 22 Jul 2023 145th fgrosshans 🇫🇷 785 79 63ms 23 Jul 2024 145th EnTerr 785 79 47ms 1 Sep 2024 145th jipsong 🇩🇪 785 79 56ms 20 Jun 2025 145th 77Tigers 785 79 41ms 13 Jan 2026 151st ageneric 775 80 41ms 7 Feb 2021 151st jacklynnepenick 775 80 38ms 19 Aug 2021 151st ehulinsky 🇺🇸 775 80 46ms 10 Nov 2021 151st NewDefectus 🇮🇱 775 80 17ms 15 Dec 2021 151st ZakkkkAttackkkk 🇵🇭 775 80 32ms 21 Dec 2021 151st guilhem-roy 🇫🇷 775 80 50ms 26 Feb 2022 151st suwat513 775 80 71ms 15 Sep 2022 151st btjones0 775 80 49ms 18 Nov 2022 151st nstearns96 🇬🇧 775 80 16ms 15 Dec 2022 151st kellantech 775 80 10ms 3 Jun 2023 First Prev 81–160 of 712 Next Last
