The Calendar hole will go live in approximately 12 days. 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 561st snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 562nd GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 563rd MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 564th dokutan 803 49 54ms 30 Apr 2024 565th emplv 🇱🇻 803 55 13ms 21 Nov 2022 565th dmrichwa 🇺🇸 803 55 12ms 14 Jan 2023 565th rucin93 🇵🇱 803 55 12ms 2 Aug 2024 565th vlpx 🇫🇮 803 55 15ms 23 Sep 2024 565th sean-niemann 🇺🇸 803 55 12ms 18 Jan 2025 570th rhdqor213 803 66 5ms 6 Oct 2023 571st suwat513 801 62 17ms 6 Dec 2022 571st StefanHabel 🇨🇦 801 62 19ms 19 Dec 2022 571st Ripick 801 62 23ms 1 Feb 2023 571st quimey 801 62 17ms 8 Mar 2023 571st firegene 🇮🇪 801 62 16ms 2 Apr 2023 571st Andriamanitra 🇫🇮 801 62 17ms 17 Jul 2023 571st Re-Adventures 🇮🇳 801 62 18ms 20 Jul 2023 571st fkantelberg 801 62 17ms 12 Aug 2023 571st Mikey-Beep 🇬🇧 801 62 16ms 23 Aug 2023 571st htareque 801 62 16ms 13 Oct 2023 571st BREMAUCY 🇫🇷 801 62 17ms 14 May 2024 571st ahmetdemirag 🇨🇾 801 62 18ms 25 Jun 2024 571st cros107 🇦🇺 801 62 22ms 27 Jun 2024 571st codingisgreatbutiamnot 801 62 16ms 6 Aug 2024 571st tjwrenn 801 62 17ms 6 Dec 2024 586th Yewzir 🇧🇪 801 79 335ms 13 Feb 2024 587th Yewzir 🇧🇪 801 86 457ms 2 Oct 2025 588th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 588th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 590th primo-ppcg 🇹🇭 800 67 56ms 20 Nov 2022 591st Steffan153 🇫🇮 799 76 1,295ms 14 Jan 2023 592nd sean-niemann 🇺🇸 797 55 140ms 19 May 2025 593rd Shanethegamer 🇺🇸 796 158 410ms 29 May 2025 594th emgordon154 795 56 56ms 6 Jun 2025 595th stefangimmillaro 795 59 27ms 20 Nov 2022 596th inventshah 795 69 13ms 20 Nov 2022 597th DialFrost 🇸🇬 793 67 34ms 1 Nov 2023 598th emplv 🇱🇻 793 109 270ms 21 Jun 2023 599th snoozingnewt 🇨🇦 792 65 4,098ms 27 Sep 2025 600th msbranicky 792 72 147ms 1 Sep 2023 600th snoozingnewt 🇨🇦 792 72 259ms 9 Oct 2025 602nd Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 603rd primo-ppcg 🇹🇭 791 60 3ms 20 Nov 2022 604th KasperKivimaeki 🇫🇮 791 67 5ms 31 Mar 2025 605th emgordon154 791 87 409ms 25 Sep 2025 606th Yewzir 🇧🇪 791 142 2,317ms 14 Nov 2025 607th MeWhenI 🇻🇦 790 177 39ms 29 Nov 2023 608th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 609th trist224 🇫🇷 788 63 16ms 14 Dec 2022 609th retrohun 788 63 19ms 28 Dec 2022 609th msbranicky 788 63 22ms 23 Jul 2023 609th PeterTillema 🇳🇱 788 63 17ms 18 Mar 2024 609th hellwue 788 63 302ms 25 Jun 2024 609th InigoK 🇺🇸 788 63 24ms 19 Sep 2025 615th pardouin 🇫🇷 788 68 57ms 25 Apr 2025 615th edsrzf 🇳🇿 788 68 47ms 9 days ago 617th AlephSquirrel 787 50 42ms 7 Mar 2023 617th SirBogman 🇺🇸 787 50 55ms 10 Jan 2024 619th sean-niemann 🇺🇸 786 110 272ms 21 Jun 2023 619th stefangimmillaro 786 110 268ms 22 Jun 2023 621st sisyphus-ppcg 🇦🇺 785 45 13ms 23 Jan 2023 621st Steffan153 🇫🇮 785 45 4ms 9 Feb 2023 621st DialFrost 🇸🇬 785 45 4ms 25 Nov 2023 624th Yewzir 🇧🇪 783 43 903ms 13 Feb 2024 624th dokutan 783 43 981ms 30 Apr 2024 626th rucin93 🇵🇱 783 56 140ms 30 Aug 2024 627th Steffan153 🇫🇮 783 84 6ms 16 Jul 2023 627th typeswitch-dev 🇵🇹 783 84 398ms 28 Jul 2023 627th GrayJoKing 🇦🇺 783 84 375ms 29 Jul 2023 630th targrik 782 60 7ms 16 Jan 2025 631st pardouin 🇫🇷 782 79 187ms 22 Apr 2025 632nd SirBogman 🇺🇸 780 33 332ms 22 Nov 2022 633rd inventshah 779 68 5ms 29 Nov 2022 633rd xsot 🇸🇬 779 68 4ms 10 Feb 2024 635th Steffan153 🇫🇮 779 111 280ms 20 Nov 2022 636th Steffan153 🇫🇮 778 72 98ms 20 Nov 2022 636th emplv 🇱🇻 778 72 100ms 30 Nov 2022 638th albanian-laundromat 776 55 774ms 12 Sep 2025 639th jakobkordez 🇸🇮 776 64 2,278ms 20 Nov 2022 639th nstearns96 🇬🇧 776 64 245ms 23 Nov 2022 First Prev 561–640 of 1,799 Next Last