The Calendar hole will go live in approximately 13 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 dokutan 754 92 439ms 15 Jul 2025 722nd MeWhenI 🇻🇦 753 66 41ms 14 May 2023 723rd msbranicky 752 63 570ms 16 Jan 2024 724th Steffan153 🇫🇮 752 78 35ms 14 Jul 2023 724th GrayJoKing 🇦🇺 752 78 41ms 13 Aug 2023 724th kg583 🇺🇸 752 78 31ms 2 Oct 2025 727th dokutan 750 32 3ms 14 Nov 2024 728th retrohun 750 64 4,903ms 5 Nov 2023 729th Shanethegamer 🇺🇸 750 81 1,252ms 30 Nov 2022 730th inventshah 749 59 11ms 20 Nov 2022 730th Argeento 🇵🇱 749 59 12ms 26 Aug 2023 732nd emgordon154 749 119 255ms 19 Mar 2025 733rd error256 748 55 59ms 4 Jun 2024 734th m-tkach 🇺🇦 748 72 4ms 22 Nov 2022 734th emplv 🇱🇻 748 72 4ms 30 Nov 2022 734th Steffan153 🇫🇮 748 72 4ms 3 Jan 2023 734th sean-niemann 🇺🇸 748 72 5ms 7 May 2024 734th solisolu 748 72 4ms 19 Nov 2025 739th MeWhenI 🇻🇦 747 98 73ms 9 Apr 2024 739th snoozingnewt 🇨🇦 747 98 488ms 6 Oct 2025 741st m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 742nd steffan-polygolf 746 73 25ms 7 Mar 2024 743rd msbranicky 745 92 123ms 1 Oct 2023 744th janbehrens 🇩🇪 744 63 15ms 20 Nov 2022 745th MaxElf999 744 68 17ms 21 Nov 2022 745th guilhem-roy 🇫🇷 744 68 16ms 21 Nov 2022 745th knutae 🇳🇴 744 68 18ms 30 Nov 2022 745th 4ndyJ 🇬🇧 744 68 16ms 10 Jan 2023 745th andre-lameirinhas 🇵🇹 744 68 17ms 18 May 2023 745th WillConker 744 68 20ms 16 Jul 2023 745th AforAmpere 744 68 16ms 20 Sep 2023 745th Simpos 744 68 30ms 24 Oct 2023 745th mikehanus 744 68 19ms 22 Nov 2023 745th chartung17 744 68 17ms 31 Dec 2023 745th mathisfun271 744 68 23ms 13 Feb 2024 745th 77Tigers 744 68 16ms 22 Jun 2024 745th moustave 744 68 17ms 12 Nov 2024 758th Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 759th JRaspass 🇬🇧 742 43 149ms 19 Nov 2022 759th Shanethegamer 🇺🇸 742 43 218ms 19 Nov 2022 759th SirBogman 🇺🇸 742 43 163ms 20 Nov 2022 759th sean-niemann 🇺🇸 742 43 140ms 20 Nov 2022 759th trist224 🇫🇷 742 43 149ms 14 Dec 2022 759th MeWhenI 🇻🇦 742 43 166ms 30 Jan 2023 759th Yewzir 🇧🇪 742 43 370ms 14 Feb 2024 759th fuzzylojik-golf 🇺🇸 742 43 174ms 21 Aug 2025 767th dokutan 742 92 26ms 24 days ago 768th h3ra993huskp 🇯🇵 742 94 488ms 18 days ago 769th janbehrens 🇩🇪 740 99 66ms 20 Nov 2022 769th Yewzir 🇧🇪 740 99 84ms 12 Feb 2024 771st Steffan153 🇫🇮 738 65 1,803ms 14 Jan 2023 772nd thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 772nd stefangimmillaro 737 60 12ms 4 Sep 2024 772nd targrik 737 60 12ms 6 Feb 2025 772nd Lv0Sys 🇵🇱 737 60 13ms 11 days ago 776th rucin93 🇵🇱 734 63 9ms 18 Nov 2025 777th juliusgeo 733 69 16ms 13 Jan 2023 777th jhu04 733 69 19ms 18 Jan 2024 777th ImpressedByRocks 733 69 16ms 15 Nov 2024 780th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 781st GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 782nd emgordon154 730 95 531ms 28 May 2025 783rd Steffan153 🇫🇮 729 53 53ms 21 Apr 2023 784th MeWhenI 🇻🇦 729 57 387ms 14 Feb 2023 784th dokutan 729 57 426ms 9 Apr 2024 786th CheeseCake628 🇳🇴 729 65 397ms 18 Oct 2025 787th jared-hughes 728 74 4ms 20 Nov 2022 788th annaproxy 727 85 243ms 22 Nov 2022 788th Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 790th Shanethegamer 🇺🇸 726 75 57ms 18 Dec 2023 791st Shanethegamer 🇺🇸 726 84 133ms 22 Nov 2022 792nd retrohun 725 44 238ms 30 Dec 2022 792nd neel11235813 725 44 280ms 3 Feb 2023 794th Chinay-Domitrix 🇺🇸 725 71 4,937ms 2 Apr 2025 795th jared-hughes 724 61 12ms 20 Nov 2022 795th janbehrens 🇩🇪 724 61 12ms 20 Nov 2022 795th tayloia 🇬🇧 724 61 11ms 9 Jan 2023 795th iczelia 🇩🇪 724 61 12ms 5 Nov 2025 799th Yewzir 🇧🇪 724 123 269ms 12 Feb 2024 799th MeWhenI 🇻🇦 724 123 274ms 9 Apr 2024 First Prev 721–800 of 1,815 Next Last