The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Pernicious Numbers (Long) 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 559th minhtrancccp 830 61 20ms 11 Jan 2024 559th stertooy 🇧🇪 830 61 17ms 14 Jun 2024 563rd SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 564th Ripick 829 69 151ms 8 Jan 2023 564th dokutan 829 69 146ms 31 Dec 2023 564th Yewzir 🇧🇪 829 69 152ms 14 Feb 2024 564th janAkali 🇷🇺 829 69 153ms 3 days ago 568th GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 568th 5cw 🇺🇸 828 29 5ms 10 Apr 2023 568th codereport 🇨🇦 828 29 2ms 17 May 2024 571st AlephSquirrel 824 50 45ms 7 Mar 2023 571st SirBogman 🇺🇸 824 50 46ms 10 Jan 2024 573rd jared-hughes 824 89 66ms 20 Nov 2022 573rd roupiq 🇵🇱 824 89 68ms 3 Jan 2024 573rd Herbert00709 🇵🇱 824 89 64ms 7 Jun 2024 573rd DialFrost 🇸🇬 824 89 62ms 17 Jun 2024 573rd KasperKivimaeki 🇫🇮 824 89 72ms 7 Dec 2025 578th snoozingnewt 🇨🇦 822 52 876ms 31 Dec 2025 579th Lv0Sys 🇵🇱 819 54 17ms 26 days ago 580th KatieLG 🇬🇧 817 62 16ms 26 Nov 2022 580th suwat513 817 62 17ms 6 Dec 2022 580th StefanHabel 🇨🇦 817 62 17ms 19 Dec 2022 580th Ripick 817 62 17ms 1 Feb 2023 580th quimey 817 62 17ms 8 Mar 2023 580th yzhs 🇩🇪 817 62 23ms 23 Jun 2023 580th Andriamanitra 🇫🇮 817 62 18ms 17 Jul 2023 580th Re-Adventures 🇮🇳 817 62 18ms 20 Jul 2023 580th fkantelberg 817 62 18ms 12 Aug 2023 580th Mikey-Beep 🇬🇧 817 62 17ms 23 Aug 2023 580th htareque 817 62 18ms 13 Oct 2023 580th neel11235813 817 62 18ms 27 Mar 2024 580th SB-945 817 62 17ms 31 Mar 2024 580th BREMAUCY 🇫🇷 817 62 18ms 14 May 2024 580th ahmetdemirag 🇨🇾 817 62 18ms 25 Jun 2024 580th cros107 🇦🇺 817 62 25ms 27 Jun 2024 580th codingisgreatbutiamnot 817 62 17ms 6 Aug 2024 580th tjwrenn 817 62 17ms 6 Dec 2024 598th emgordon154 816 85 484ms 8 Feb 2026 599th MarcMush 🇫🇷 815 51 402ms 11 Jan 2024 600th ian-h-chamberlain 🇺🇸 815 84 121ms 16 Dec 2025 601st Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 602nd Yewzir 🇧🇪 814 79 373ms 13 Feb 2024 603rd JOrE20 814 84 25ms 10 Feb 2026 604th rucin93 🇵🇱 813 56 143ms 30 Aug 2024 604th sean-niemann 🇺🇸 813 56 151ms 16 May 2025 606th Steffan153 🇫🇮 813 66 48ms 16 Jan 2023 606th CLOStrophobic 🇮🇹 813 66 54ms 3 Mar 2025 606th GolfingSuccess 🇬🇷 813 66 49ms 11 days ago 609th Steffan153 🇫🇮 813 75 131ms 14 Jan 2023 610th MeWhenI 🇻🇦 812 155 1,426ms 28 Mar 2025 611th Yewzir 🇧🇪 811 86 377ms 2 Oct 2025 612th madex 🇩🇪 807 64 2,612ms 9 days ago 613th rucin93 🇵🇱 807 156 1,431ms 20 Mar 2025 614th MichalMarsalek 🇨🇿 805 71 148ms 16 Dec 2022 615th frankgraziano 805 84 30ms 23 Feb 2026 616th emplv 🇱🇻 804 55 13ms 21 Nov 2022 616th dmrichwa 🇺🇸 804 55 12ms 14 Jan 2023 616th rucin93 🇵🇱 804 55 15ms 2 Aug 2024 616th vlpx 🇫🇮 804 55 13ms 23 Sep 2024 616th sean-niemann 🇺🇸 804 55 12ms 18 Jan 2025 621st trist224 🇫🇷 804 63 16ms 14 Dec 2022 621st retrohun 804 63 18ms 28 Dec 2022 621st msbranicky 804 63 18ms 23 Jul 2023 621st PeterTillema 🇳🇱 804 63 19ms 18 Mar 2024 621st hellwue 804 63 321ms 25 Jun 2024 621st InigoK 🇺🇸 804 63 27ms 19 Sep 2025 627th rhdqor213 804 67 5ms 6 Oct 2023 627th KasperKivimaeki 🇫🇮 804 67 5ms 31 Mar 2025 629th albanian-laundromat 803 59 437ms 8 Oct 2025 630th pardouin 🇫🇷 802 68 34ms 24 Apr 2025 631st pardouin 🇫🇷 802 76 145ms 23 Apr 2025 632nd Steffan153 🇫🇮 802 111 301ms 20 Nov 2022 633rd primo-ppcg 🇹🇭 801 67 56ms 20 Nov 2022 634th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 634th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 636th Yewzir 🇧🇪 800 52 278ms 26 Feb 2024 636th antimon2 🇯🇵 800 52 323ms 5 May 2024 638th Steffan153 🇫🇮 799 76 1,305ms 14 Jan 2023 639th primo-ppcg 🇹🇭 798 40 224ms 20 Nov 2022 639th Steffan153 🇫🇮 798 40 281ms 23 Nov 2022 First Prev 561–640 of 1,885 Next Last