The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Emirp Numbers in all languages 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 721st Waffle3z 788 81 10ms 5 Jun 2021 721st KrausRaus 🇺🇸 788 81 10ms 31 Dec 2021 721st inventshah 788 81 9ms 19 Jun 2022 724th ovs-code 🇩🇪 787 69 167ms 17 Nov 2024 725th KatieLG 🇬🇧 787 72 38ms 30 Nov 2020 725th Matter1024 🇮🇳 787 72 37ms 5 Dec 2025 727th AaronGarbut 785 105 2ms 30 Jul 2019 727th alexjlaberge 785 105 1ms 21 Jul 2020 729th fuzzylojik-golf 🇺🇸 785 112 460ms 30 Aug 2025 730th dcgjb 784 71 229ms 12 Sep 2024 731st Yewzir 🇧🇪 784 84 5ms 14 Dec 2023 731st dokutan 784 84 6ms 8 May 2024 731st Shanethegamer 🇺🇸 784 84 6ms 18 Aug 2024 731st emgordon154 784 84 7ms 5 Dec 2024 731st snoozingnewt 🇨🇦 784 84 7ms 30 Nov 2025 736th anastos 784 96 146ms 23 Jul 2018 736th user189032 784 96 146ms 29 May 2019 736th yzhs 🇩🇪 784 96 155ms 24 Jul 2021 736th cbrt-x 784 96 243ms 19 Sep 2023 736th the-zammers 784 96 188ms 10 Nov 2023 741st prplz 🇦🇺 783 82 5ms 10 Jul 2021 742nd emgordon154 783 83 3ms 23 Dec 2024 743rd MeWhenI 🇻🇦 783 95 1,256ms 26 Oct 2021 744th Shanethegamer 🇺🇸 782 110 6ms 21 Mar 2023 745th SirBogman 🇺🇸 781 32 2ms 8 Feb 2023 745th DialFrost 🇸🇬 781 32 2ms 3 Feb 2024 745th bstrat 781 32 2ms 11 Jun 2024 745th edsrzf 🇳🇿 781 32 3ms 4 days ago 749th jared-hughes 781 92 2ms 17 Jul 2022 749th primo-ppcg 🇹🇭 781 92 2ms 19 Jul 2022 751st GrayJoKing 🇦🇺 779 92 3ms 7 Feb 2023 752nd primo-ppcg 🇹🇭 778 106 1ms 15 Oct 2020 752nd Yewzir 🇧🇪 778 106 1ms 22 Dec 2023 754th alomiF 776 97 170ms 24 Aug 2024 755th doge1338 776 139 285ms 14 Dec 2020 756th MeWhenI 🇻🇦 775 85 6ms 12 Dec 2023 757th snoozingnewt 🇨🇦 775 146 1ms 1 Oct 2025 758th yokasuretsu 774 50 102ms 22 Jun 2018 758th Shanethegamer 🇺🇸 774 50 111ms 27 Apr 2021 758th ovs-code 🇩🇪 774 50 155ms 8 May 2024 761st ssilwa 773 85 51ms 20 Jan 2018 761st 5cw 🇺🇸 773 85 12ms 20 Apr 2024 761st Matter1024 🇮🇳 773 85 10ms 17 Nov 2025 764th DialFrost 🇸🇬 773 93 48ms 16 Dec 2025 765th dokutan 772 87 2ms 21 Feb 2026 766th Yewzir 🇧🇪 771 69 64ms 11 Mar 2024 767th iznax 771 107 391ms 21 Nov 2021 767th dokutan 771 107 1ms 29 Apr 2024 769th GrayJoKing 🇦🇺 769 83 317ms 30 Mar 2021 769th MeWhenI 🇻🇦 769 83 11ms 6 Nov 2022 769th two-bad 🇬🇧 769 83 10ms 15 Feb 2024 772nd boxjelly 768 98 236ms 5 Jan 2021 772nd tobeannouncd 768 98 157ms 9 Jan 2024 774th Steffan153 🇫🇮 765 71 142ms 3 Aug 2024 775th Natanaelel 🇸🇪 765 74 41ms 12 Sep 2021 775th Andriamanitra 🇫🇮 765 74 42ms 29 Oct 2022 775th jbbarth 🇫🇷 765 74 43ms 5 Nov 2022 775th error256 765 74 40ms 19 May 2024 775th denkyuu1 765 74 41ms 8 days ago 780th prplz 🇦🇺 765 99 81ms 6 Jul 2020 781st hirosuzuki 764 86 8ms 24 Feb 2019 781st Sakaala 764 86 10ms 20 Apr 2019 781st bob-th 764 86 10ms 11 Aug 2022 781st BrunoVisnadi 🇧🇷 764 86 11ms 30 Sep 2025 785th tkr-sh 🇰🇵 764 108 401ms 14 Jun 2022 785th JohandeRuiter 🇳🇱 764 108 2ms 26 Nov 2023 785th fuzzylojik-golf 🇺🇸 764 108 1ms 6 Jul 2025 788th fuzzylojik-golf 🇺🇸 763 126 57ms 6 Jul 2025 789th MeWhenI 🇻🇦 762 80 930ms 30 Aug 2025 790th dokutan 761 113 5ms 15 Jan 2024 791st LordSir101 760 84 10ms 10 Sep 2025 792nd fruno-bulax 760 99 146ms 16 Feb 2019 793rd bbkr 759 51 100ms 14 Nov 2018 793rd somebody1234 759 51 104ms 9 Dec 2018 793rd metakuna 759 51 133ms 12 Apr 2019 793rd BBoehm 🇩🇪 759 51 100ms 30 Dec 2020 793rd prplz 🇦🇺 759 51 130ms 9 May 2021 798th dokutan 759 102 114ms 23 Jul 2025 799th primo-ppcg 🇹🇭 759 135 2ms 3 Oct 2020 800th ngn 🇧🇬 758 33 9ms 6 Feb 2022 First Prev 721–800 of 3,203 Next Last