The Calendar hole will go live in approximately 7 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 719th betaveros 755 67 32ms 31 Dec 2022 719th vgamula 🇺🇦 755 67 17ms 15 Mar 2023 719th VictorStenvers 🇳🇱 755 67 18ms 26 Mar 2025 724th DialFrost 🇸🇬 755 71 48ms 7 Dec 2024 725th Alex-x90 🇺🇸 755 97 61ms 20 Nov 2022 726th snoozingnewt 🇨🇦 755 118 261ms 9 Oct 2025 727th dokutan 754 92 439ms 15 Jul 2025 728th MeWhenI 🇻🇦 753 66 41ms 14 May 2023 729th msbranicky 752 63 570ms 16 Jan 2024 730th Steffan153 🇫🇮 752 78 35ms 14 Jul 2023 730th GrayJoKing 🇦🇺 752 78 41ms 13 Aug 2023 730th kg583 🇺🇸 752 78 31ms 2 Oct 2025 733rd dokutan 750 32 3ms 14 Nov 2024 734th retrohun 750 64 4,085ms 5 Nov 2023 735th Shanethegamer 🇺🇸 750 81 1,252ms 30 Nov 2022 736th inventshah 749 59 11ms 20 Nov 2022 736th Argeento 🇵🇱 749 59 12ms 26 Aug 2023 736th DialFrost 🇸🇬 749 59 12ms 5 days ago 739th emgordon154 749 119 255ms 19 Mar 2025 740th m-tkach 🇺🇦 748 72 4ms 22 Nov 2022 740th emplv 🇱🇻 748 72 4ms 30 Nov 2022 740th Steffan153 🇫🇮 748 72 4ms 3 Jan 2023 740th sean-niemann 🇺🇸 748 72 5ms 7 May 2024 740th solisolu 748 72 4ms 19 Nov 2025 745th steffan-polygolf 747 73 25ms 7 Mar 2024 746th MeWhenI 🇻🇦 747 98 56ms 9 Apr 2024 746th snoozingnewt 🇨🇦 747 98 411ms 6 Oct 2025 748th m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 749th msbranicky 745 92 123ms 1 Oct 2023 750th janbehrens 🇩🇪 744 63 14ms 20 Nov 2022 751st MaxElf999 744 68 17ms 21 Nov 2022 751st guilhem-roy 🇫🇷 744 68 16ms 21 Nov 2022 751st knutae 🇳🇴 744 68 18ms 30 Nov 2022 751st 4ndyJ 🇬🇧 744 68 16ms 10 Jan 2023 751st andre-lameirinhas 🇵🇹 744 68 17ms 18 May 2023 751st WillConker 744 68 20ms 16 Jul 2023 751st AforAmpere 744 68 16ms 20 Sep 2023 751st Simpos 744 68 30ms 24 Oct 2023 751st mikehanus 744 68 19ms 22 Nov 2023 751st chartung17 744 68 17ms 31 Dec 2023 751st mathisfun271 744 68 23ms 13 Feb 2024 751st 77Tigers 744 68 16ms 22 Jun 2024 751st moustave 744 68 17ms 12 Nov 2024 764th Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 765th JRaspass 🇬🇧 742 43 159ms 19 Nov 2022 765th Shanethegamer 🇺🇸 742 43 160ms 19 Nov 2022 765th SirBogman 🇺🇸 742 43 194ms 20 Nov 2022 765th sean-niemann 🇺🇸 742 43 125ms 20 Nov 2022 765th trist224 🇫🇷 742 43 148ms 14 Dec 2022 765th MeWhenI 🇻🇦 742 43 165ms 30 Jan 2023 765th Yewzir 🇧🇪 742 43 258ms 14 Feb 2024 765th fuzzylojik-golf 🇺🇸 742 43 149ms 21 Aug 2025 773rd dokutan 742 92 26ms 24 Nov 2025 774th h3ra993huskp 🇯🇵 742 94 488ms 24 days ago 775th janbehrens 🇩🇪 740 99 61ms 20 Nov 2022 775th Yewzir 🇧🇪 740 99 65ms 12 Feb 2024 777th Steffan153 🇫🇮 738 65 1,452ms 14 Jan 2023 778th thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 778th stefangimmillaro 737 60 12ms 4 Sep 2024 778th targrik 737 60 12ms 6 Feb 2025 778th Lv0Sys 🇵🇱 737 60 13ms 16 days ago 778th error256 737 60 13ms 36 mins ago 783rd rucin93 🇵🇱 734 63 9ms 18 Nov 2025 784th juliusgeo 733 69 16ms 13 Jan 2023 784th jhu04 733 69 19ms 18 Jan 2024 784th ImpressedByRocks 733 69 16ms 15 Nov 2024 787th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 788th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 789th emgordon154 730 95 531ms 28 May 2025 790th Steffan153 🇫🇮 729 53 53ms 21 Apr 2023 791st MeWhenI 🇻🇦 729 57 357ms 14 Feb 2023 791st dokutan 729 57 348ms 9 Apr 2024 793rd CheeseCake628 🇳🇴 729 65 397ms 18 Oct 2025 794th jared-hughes 728 74 4ms 20 Nov 2022 795th Shanethegamer 🇺🇸 727 75 57ms 18 Dec 2023 796th annaproxy 727 85 243ms 22 Nov 2022 796th Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 798th Shanethegamer 🇺🇸 726 84 133ms 22 Nov 2022 799th retrohun 725 44 168ms 30 Dec 2022 799th neel11235813 725 44 192ms 3 Feb 2023 First Prev 721–800 of 1,819 Next Last