The Calendar hole will go live in approximately 25 hours. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in all languages in chars. 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 560th CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 562nd MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 563rd Steffan153 🇫🇮 811 35 275ms 23 Nov 2022 564th DialFrost 🇸🇬 808 139 1,670ms 13 Sep 2025 565th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 566th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 567th GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 568th emplv 🇱🇻 804 55 13ms 21 Nov 2022 568th dmrichwa 🇺🇸 804 55 12ms 14 Jan 2023 568th rucin93 🇵🇱 804 55 12ms 2 Aug 2024 568th vlpx 🇫🇮 804 55 15ms 23 Sep 2024 568th sean-niemann 🇺🇸 804 55 12ms 18 Jan 2025 573rd MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 574th dokutan 803 49 56ms 30 Apr 2024 575th rhdqor213 803 66 5ms 6 Oct 2023 576th suwat513 801 62 17ms 6 Dec 2022 576th StefanHabel 🇨🇦 801 62 19ms 19 Dec 2022 576th Ripick 801 62 23ms 1 Feb 2023 576th quimey 801 62 17ms 8 Mar 2023 576th firegene 🇮🇪 801 62 16ms 2 Apr 2023 576th Andriamanitra 🇫🇮 801 62 17ms 17 Jul 2023 576th Re-Adventures 🇮🇳 801 62 18ms 20 Jul 2023 576th fkantelberg 801 62 17ms 12 Aug 2023 576th Mikey-Beep 🇬🇧 801 62 16ms 23 Aug 2023 576th htareque 801 62 16ms 13 Oct 2023 576th BREMAUCY 🇫🇷 801 62 17ms 14 May 2024 576th ahmetdemirag 🇨🇾 801 62 18ms 25 Jun 2024 576th cros107 🇦🇺 801 62 22ms 27 Jun 2024 576th codingisgreatbutiamnot 801 62 16ms 6 Aug 2024 576th tjwrenn 801 62 17ms 6 Dec 2024 591st Yewzir 🇧🇪 801 79 335ms 13 Feb 2024 592nd Yewzir 🇧🇪 801 86 457ms 2 Oct 2025 593rd ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 593rd snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 595th primo-ppcg 🇹🇭 800 67 56ms 20 Nov 2022 596th Steffan153 🇫🇮 799 76 1,295ms 14 Jan 2023 597th sean-niemann 🇺🇸 797 55 140ms 19 May 2025 598th Shanethegamer 🇺🇸 796 158 410ms 29 May 2025 599th emgordon154 795 56 56ms 6 Jun 2025 600th stefangimmillaro 795 59 32ms 20 Nov 2022 601st inventshah 795 69 13ms 20 Nov 2022 602nd DialFrost 🇸🇬 793 67 34ms 1 Nov 2023 603rd emplv 🇱🇻 793 109 270ms 21 Jun 2023 604th snoozingnewt 🇨🇦 792 65 3,450ms 27 Sep 2025 605th msbranicky 792 72 147ms 1 Sep 2023 605th snoozingnewt 🇨🇦 792 72 259ms 9 Oct 2025 607th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 608th primo-ppcg 🇹🇭 791 60 3ms 20 Nov 2022 609th KasperKivimaeki 🇫🇮 791 67 5ms 31 Mar 2025 610th emgordon154 791 87 409ms 25 Sep 2025 611th Yewzir 🇧🇪 791 142 2,317ms 14 Nov 2025 612th MeWhenI 🇻🇦 790 177 39ms 29 Nov 2023 613th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 614th trist224 🇫🇷 788 63 16ms 14 Dec 2022 614th retrohun 788 63 19ms 28 Dec 2022 614th msbranicky 788 63 22ms 23 Jul 2023 614th PeterTillema 🇳🇱 788 63 17ms 18 Mar 2024 614th hellwue 788 63 302ms 25 Jun 2024 614th InigoK 🇺🇸 788 63 24ms 19 Sep 2025 620th pardouin 🇫🇷 788 68 57ms 25 Apr 2025 621st AlephSquirrel 787 50 44ms 7 Mar 2023 621st SirBogman 🇺🇸 787 50 54ms 10 Jan 2024 623rd Steffan153 🇫🇮 787 75 49ms 22 Aug 2024 624th sean-niemann 🇺🇸 786 110 272ms 21 Jun 2023 624th stefangimmillaro 786 110 268ms 22 Jun 2023 626th sisyphus-ppcg 🇦🇺 785 45 13ms 23 Jan 2023 626th Steffan153 🇫🇮 785 45 4ms 9 Feb 2023 626th DialFrost 🇸🇬 785 45 4ms 25 Nov 2023 629th DialFrost 🇸🇬 785 59 9ms 4 days ago 630th Yewzir 🇧🇪 783 43 903ms 13 Feb 2024 630th dokutan 783 43 981ms 30 Apr 2024 632nd rucin93 🇵🇱 783 56 140ms 30 Aug 2024 633rd Steffan153 🇫🇮 783 84 6ms 16 Jul 2023 633rd typeswitch-dev 🇵🇹 783 84 398ms 28 Jul 2023 633rd GrayJoKing 🇦🇺 783 84 371ms 29 Jul 2023 636th targrik 782 60 8ms 16 Jan 2025 637th pardouin 🇫🇷 782 79 187ms 22 Apr 2025 638th SirBogman 🇺🇸 780 33 349ms 22 Nov 2022 639th inventshah 779 68 5ms 29 Nov 2022 639th xsot 🇸🇬 779 68 4ms 10 Feb 2024 First Prev 561–640 of 1,805 Next Last