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 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 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 Bytes Time Submitted 545th cros107 🇦🇺 816 62 22ms 27 Jun 2024 545th codingisgreatbutiamnot 816 62 16ms 6 Aug 2024 545th tjwrenn 816 62 17ms 6 Dec 2024 564th MarcMush 🇫🇷 815 51 514ms 11 Jan 2024 565th ian-h-chamberlain 🇺🇸 815 84 141ms 2 days ago 566th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 567th rucin93 🇵🇱 813 56 140ms 30 Aug 2024 567th sean-niemann 🇺🇸 813 56 139ms 16 May 2025 569th Steffan153 🇫🇮 813 75 126ms 14 Jan 2023 570th Steffan153 🇫🇮 812 66 48ms 16 Jan 2023 570th CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 572nd Yewzir 🇧🇪 812 79 335ms 13 Feb 2024 573rd MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 574th Yewzir 🇧🇪 811 86 457ms 2 Oct 2025 575th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 576th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 577th rhdqor213 804 67 5ms 6 Oct 2023 577th KasperKivimaeki 🇫🇮 804 67 5ms 31 Mar 2025 579th MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 580th emplv 🇱🇻 803 55 13ms 21 Nov 2022 580th dmrichwa 🇺🇸 803 55 12ms 14 Jan 2023 580th rucin93 🇵🇱 803 55 12ms 2 Aug 2024 580th vlpx 🇫🇮 803 55 15ms 23 Sep 2024 580th sean-niemann 🇺🇸 803 55 12ms 18 Jan 2025 585th GolfingSuccess 🇬🇷 803 59 344ms 15 Jan 2024 585th albanian-laundromat 803 59 335ms 8 Oct 2025 587th trist224 🇫🇷 803 63 16ms 14 Dec 2022 587th retrohun 803 63 19ms 28 Dec 2022 587th msbranicky 803 63 22ms 23 Jul 2023 587th PeterTillema 🇳🇱 803 63 17ms 18 Mar 2024 587th hellwue 803 63 302ms 25 Jun 2024 587th InigoK 🇺🇸 803 63 24ms 19 Sep 2025 593rd pardouin 🇫🇷 802 76 139ms 23 Apr 2025 594th emgordon154 802 87 409ms 25 Sep 2025 595th Steffan153 🇫🇮 802 111 280ms 20 Nov 2022 596th pardouin 🇫🇷 801 68 33ms 24 Apr 2025 597th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 597th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 599th primo-ppcg 🇹🇭 800 67 56ms 20 Nov 2022 600th Yewzir 🇧🇪 799 52 387ms 26 Feb 2024 600th antimon2 🇯🇵 799 52 436ms 5 May 2024 602nd Steffan153 🇫🇮 799 76 1,295ms 14 Jan 2023 603rd primo-ppcg 🇹🇭 798 40 282ms 20 Nov 2022 603rd Steffan153 🇫🇮 798 40 608ms 23 Nov 2022 603rd Natanaelel 🇸🇪 798 40 273ms 5 Jan 2024 606th Shanethegamer 🇺🇸 796 158 410ms 29 May 2025 607th emgordon154 795 56 56ms 6 Jun 2025 608th stefangimmillaro 795 59 27ms 20 Nov 2022 608th DialFrost 🇸🇬 795 59 26ms 12 Feb 2023 610th inventshah 795 69 13ms 20 Nov 2022 611th emplv 🇱🇻 795 112 274ms 21 Nov 2022 611th sean-niemann 🇺🇸 795 112 276ms 21 Jun 2023 613th GrayJoKing 🇦🇺 793 67 34ms 26 Oct 2023 613th DialFrost 🇸🇬 793 67 34ms 21 Dec 2023 615th janbehrens 🇩🇪 792 52 46ms 27 Nov 2022 616th snoozingnewt 🇨🇦 792 65 4,098ms 27 Sep 2025 617th msbranicky 792 72 147ms 1 Sep 2023 617th snoozingnewt 🇨🇦 792 72 259ms 9 Oct 2025 619th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 620th primo-ppcg 🇹🇭 791 60 3ms 20 Nov 2022 621st QuincyNash 🇺🇸 791 64 17ms 20 Nov 2022 621st nstearns96 🇬🇧 791 64 245ms 23 Nov 2022 621st Bodo171 791 64 16ms 27 Nov 2022 621st TaserTheFox 🇺🇸 791 64 16ms 14 Jan 2023 621st jmerle 🇳🇱 791 64 16ms 16 Feb 2023 621st vishwathg 791 64 16ms 7 Apr 2023 621st dteague3989 791 64 16ms 8 Aug 2023 621st NickTheEASDude 🇺🇸 791 64 23ms 1 May 2024 621st aalec 791 64 16ms 3 May 2024 621st mishak-sys 791 64 16ms 25 Feb 2025 621st YAJUE114514 791 64 15ms 1 Aug 2025 621st Deedogg 791 64 16ms 30 Oct 2025 633rd Yewzir 🇧🇪 791 144 2,317ms 14 Nov 2025 634th MeWhenI 🇻🇦 790 177 39ms 29 Nov 2023 635th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 636th KatieLG 🇬🇧 789 60 352ms 16 Jan 2024 636th steffan-polygolf 789 60 377ms 7 Mar 2024 636th neel11235813 789 60 356ms 27 Mar 2024 639th pardouin 🇫🇷 788 68 57ms 25 Apr 2025 639th edsrzf 🇳🇿 788 68 47ms 9 days ago First Prev 561–640 of 1,816 Next Last