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 721st Alex-x90 🇺🇸 755 97 66ms 20 Nov 2022 722nd snoozingnewt 🇨🇦 755 118 261ms 9 Oct 2025 723rd dokutan 754 92 439ms 15 Jul 2025 724th MeWhenI 🇻🇦 753 66 41ms 14 May 2023 725th msbranicky 752 63 570ms 16 Jan 2024 726th Steffan153 🇫🇮 752 78 35ms 14 Jul 2023 726th GrayJoKing 🇦🇺 752 78 41ms 13 Aug 2023 726th kg583 🇺🇸 752 78 31ms 2 Oct 2025 729th dokutan 750 32 3ms 14 Nov 2024 730th retrohun 750 64 4,903ms 5 Nov 2023 731st Shanethegamer 🇺🇸 750 81 1,252ms 30 Nov 2022 732nd inventshah 749 59 11ms 20 Nov 2022 732nd Argeento 🇵🇱 749 59 12ms 26 Aug 2023 732nd DialFrost 🇸🇬 749 59 14ms 17 mins ago 735th emgordon154 749 119 255ms 19 Mar 2025 736th error256 748 55 59ms 4 Jun 2024 737th m-tkach 🇺🇦 748 72 4ms 22 Nov 2022 737th emplv 🇱🇻 748 72 4ms 30 Nov 2022 737th Steffan153 🇫🇮 748 72 4ms 3 Jan 2023 737th sean-niemann 🇺🇸 748 72 5ms 7 May 2024 737th solisolu 748 72 4ms 19 Nov 2025 742nd MeWhenI 🇻🇦 747 98 73ms 9 Apr 2024 742nd snoozingnewt 🇨🇦 747 98 488ms 6 Oct 2025 744th m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 745th steffan-polygolf 746 73 25ms 7 Mar 2024 746th msbranicky 745 92 123ms 1 Oct 2023 747th janbehrens 🇩🇪 744 63 15ms 20 Nov 2022 748th MaxElf999 744 68 17ms 21 Nov 2022 748th guilhem-roy 🇫🇷 744 68 16ms 21 Nov 2022 748th knutae 🇳🇴 744 68 18ms 30 Nov 2022 748th 4ndyJ 🇬🇧 744 68 16ms 10 Jan 2023 748th andre-lameirinhas 🇵🇹 744 68 17ms 18 May 2023 748th WillConker 744 68 20ms 16 Jul 2023 748th AforAmpere 744 68 16ms 20 Sep 2023 748th Simpos 744 68 30ms 24 Oct 2023 748th mikehanus 744 68 19ms 22 Nov 2023 748th chartung17 744 68 17ms 31 Dec 2023 748th mathisfun271 744 68 23ms 13 Feb 2024 748th 77Tigers 744 68 16ms 22 Jun 2024 748th moustave 744 68 17ms 12 Nov 2024 761st Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 762nd JRaspass 🇬🇧 742 43 149ms 19 Nov 2022 762nd Shanethegamer 🇺🇸 742 43 218ms 19 Nov 2022 762nd SirBogman 🇺🇸 742 43 163ms 20 Nov 2022 762nd sean-niemann 🇺🇸 742 43 140ms 20 Nov 2022 762nd trist224 🇫🇷 742 43 149ms 14 Dec 2022 762nd MeWhenI 🇻🇦 742 43 166ms 30 Jan 2023 762nd Yewzir 🇧🇪 742 43 370ms 14 Feb 2024 762nd fuzzylojik-golf 🇺🇸 742 43 174ms 21 Aug 2025 770th dokutan 742 92 26ms 24 days ago 771st h3ra993huskp 🇯🇵 742 94 488ms 18 days ago 772nd janbehrens 🇩🇪 740 99 66ms 20 Nov 2022 772nd Yewzir 🇧🇪 740 99 84ms 12 Feb 2024 774th Steffan153 🇫🇮 738 65 1,803ms 14 Jan 2023 775th thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 775th stefangimmillaro 737 60 12ms 4 Sep 2024 775th targrik 737 60 12ms 6 Feb 2025 775th Lv0Sys 🇵🇱 737 60 13ms 11 days ago 779th rucin93 🇵🇱 734 63 9ms 18 Nov 2025 780th juliusgeo 733 69 16ms 13 Jan 2023 780th jhu04 733 69 19ms 18 Jan 2024 780th ImpressedByRocks 733 69 16ms 15 Nov 2024 783rd Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 784th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 785th emgordon154 730 95 531ms 28 May 2025 786th Steffan153 🇫🇮 729 53 53ms 21 Apr 2023 787th MeWhenI 🇻🇦 729 57 387ms 14 Feb 2023 787th dokutan 729 57 426ms 9 Apr 2024 789th CheeseCake628 🇳🇴 729 65 397ms 18 Oct 2025 790th jared-hughes 728 74 4ms 20 Nov 2022 791st annaproxy 727 85 243ms 22 Nov 2022 791st Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 793rd Shanethegamer 🇺🇸 726 75 57ms 18 Dec 2023 794th Shanethegamer 🇺🇸 726 84 133ms 22 Nov 2022 795th retrohun 725 44 238ms 30 Dec 2022 795th neel11235813 725 44 280ms 3 Feb 2023 797th Chinay-Domitrix 🇺🇸 725 71 4,937ms 2 Apr 2025 798th jared-hughes 724 61 12ms 20 Nov 2022 798th janbehrens 🇩🇪 724 61 12ms 20 Nov 2022 798th tayloia 🇬🇧 724 61 11ms 9 Jan 2023 First Prev 721–800 of 1,816 Next Last