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?
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 801st ngn 🇧🇬 758 33 9ms 6 Feb 2022 802nd DialFrost 🇸🇬 758 88 3,318ms 25 Dec 2024 803rd DialFrost 🇸🇬 756 79 364ms 23 May 2024 804th tatzyr 🇯🇵 755 75 40ms 5 Dec 2024 805th alemelis 755 83 450ms 1 Sep 2024 806th MeWhenI 🇻🇦 755 85 5ms 29 May 2023 806th targrik 755 85 5ms 28 Jul 2025 808th Constructor7 755 87 9ms 24 Feb 2018 808th maartendeprez 755 87 9ms 16 Mar 2018 808th edre 755 87 10ms 1 May 2018 808th benwilliamgraham 755 87 11ms 26 Jan 2019 808th daedals 755 87 11ms 15 Apr 2019 808th villfa 755 87 10ms 25 Apr 2019 808th jiaminglimjm 🇲🇾 755 87 9ms 12 Dec 2019 808th thisishowmymindworks 🇳🇴 755 87 9ms 22 Jul 2020 808th anter69 🇭🇺 755 87 10ms 14 Jan 2021 808th HETHAT 🇩🇿 755 87 9ms 2 Feb 2021 808th vezzick 755 87 10ms 6 Mar 2021 808th ArmaanAS 755 87 9ms 21 Mar 2021 808th RYNO8 755 87 10ms 11 Nov 2021 808th tkr-sh 🇰🇵 755 87 10ms 14 Jun 2022 808th betaveros 755 87 10ms 9 Aug 2022 808th emirps 755 87 9ms 7 Feb 2023 808th CatsAreFluffy 755 87 10ms 8 Feb 2023 808th Just4FunCoder 755 87 9ms 22 Mar 2023 808th janbehrens 🇩🇪 755 87 9ms 20 Jun 2023 808th Grrisly 755 87 9ms 25 Mar 2024 808th abc7-12 755 87 9ms 10 May 2024 808th 5quiwyrm 755 87 9ms 14 Nov 2024 808th bltnppcnt 755 87 9ms 19 Dec 2024 808th fuzzylojik-golf 🇺🇸 755 87 10ms 9 Jun 2025 808th SanderRuud 755 87 10ms 13 Jul 2025 808th dirckvdende 755 87 9ms 24 Jul 2025 808th SectorCorruptor 755 87 9ms 8 Feb 2026 835th albanian-laundromat 755 88 4ms 12 Sep 2025 836th jared-hughes 755 89 2ms 5 Jul 2024 837th somebody1234 755 114 4ms 20 Nov 2018 838th KrausRaus 🇺🇸 753 63 3ms 9 Apr 2021 839th ashtraypettingzoo 🇺🇸 752 100 150ms 12 Feb 2023 840th sean-niemann 🇺🇸 752 105 21ms 19 Nov 2025 841st jakobwitte 751 85 11ms 20 Mar 2018 841st janbehrens 🇩🇪 751 85 13ms 17 Aug 2021 843rd DialFrost 🇸🇬 751 117 480ms 4 Jun 2024 844th MeWhenI 🇻🇦 749 71 61ms 2 Nov 2023 845th retrohun 749 96 2ms 25 Aug 2024 846th jared-hughes 749 126 511ms 24 Sep 2025 847th Yewzir 🇧🇪 748 115 5ms 6 Feb 2024 848th Shanethegamer 🇺🇸 747 80 442ms 18 Jun 2021 848th Codsilla 🇨🇦 747 80 753ms 3 Nov 2023 848th alemelis 747 80 402ms 22 Sep 2024 851st emgordon154 746 44 51ms 13 Sep 2024 852nd somebody1234 746 88 9ms 8 Dec 2018 852nd yzhs 🇩🇪 746 88 10ms 20 Jul 2022 852nd suwat513 746 88 9ms 13 Dec 2022 852nd m42km 746 88 9ms 6 Nov 2023 852nd namelessiw 746 88 9ms 5 Mar 2024 852nd codingisgreatbutiamnot 746 88 9ms 7 Aug 2024 852nd JOrE20 746 88 9ms 25 Feb 2026 859th clockworknazo 746 96 3ms 30 Jan 2023 860th vonagam 745 76 42ms 8 Nov 2017 860th anter69 🇭🇺 745 76 38ms 23 Dec 2020 860th hrrs01 745 76 42ms 23 Feb 2022 860th 4hg 🇺🇸 745 76 41ms 12 Jul 2022 860th OhmNomNom 745 76 34ms 8 Oct 2022 860th aaronze 🇦🇺 745 76 42ms 21 Sep 2023 860th blaztoma 🇱🇹 745 76 40ms 11 Oct 2025 860th Lv0Sys 🇵🇱 745 76 40ms 28 Nov 2025 860th lacrosse 745 76 43ms 29 Nov 2025 869th Shanethegamer 🇺🇸 745 83 81ms 16 May 2022 869th Yewzir 🇧🇪 745 83 66ms 9 Nov 2023 869th albanian-laundromat 745 83 73ms 8 Nov 2025 869th snoozingnewt 🇨🇦 745 83 70ms 6 Dec 2025 873rd flawr 745 101 128ms 20 Feb 2019 873rd drbalan 745 101 161ms 18 Jul 2020 875th JRaspass 🇬🇧 744 52 91ms 26 Dec 2017 875th IAGOAG 744 52 128ms 25 Jun 2018 875th xohmz 744 52 98ms 4 Nov 2018 875th elisherer 🇮🇱 744 52 114ms 13 Apr 2019 875th o0lit3 🇺🇸 744 52 129ms 10 Jul 2020 875th rucin93 🇵🇱 744 52 122ms 7 Sep 2020 First Prev 801–880 of 3,207 Next Last