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 721st MeWhenI 🇻🇦 747 98 73ms 9 Apr 2024 721st snoozingnewt 🇨🇦 747 98 488ms 6 Oct 2025 723rd m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 724th msbranicky 745 92 123ms 1 Oct 2023 725th janbehrens 🇩🇪 745 116 274ms 20 Nov 2022 726th janbehrens 🇩🇪 744 63 15ms 20 Nov 2022 727th Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 728th Kaffeleif 742 71 24ms 8 Feb 2024 728th DialFrost 🇸🇬 742 71 24ms 15 Dec 2024 728th snoozingnewt 🇨🇦 742 71 28ms 9 Oct 2025 731st dokutan 742 92 26ms 25 days ago 732nd bob-th 741 67 17ms 23 Dec 2022 732nd n0Oo0Oo0b 741 67 18ms 29 Dec 2022 732nd betaveros 741 67 32ms 31 Dec 2022 732nd vgamula 🇺🇦 741 67 17ms 15 Mar 2023 732nd HumanoidCPU 741 67 22ms 19 Feb 2025 732nd VictorStenvers 🇳🇱 741 67 18ms 26 Mar 2025 738th janbehrens 🇩🇪 740 99 66ms 20 Nov 2022 738th Yewzir 🇧🇪 740 99 84ms 12 Feb 2024 740th Steffan153 🇫🇮 738 65 1,803ms 14 Jan 2023 741st thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 741st stefangimmillaro 737 60 12ms 4 Sep 2024 741st targrik 737 60 12ms 6 Feb 2025 741st Lv0Sys 🇵🇱 737 60 13ms 11 days ago 745th m-tkach 🇺🇦 736 72 4ms 22 Nov 2022 745th emplv 🇱🇻 736 72 4ms 30 Nov 2022 745th Steffan153 🇫🇮 736 72 4ms 3 Jan 2023 745th sean-niemann 🇺🇸 736 72 5ms 7 May 2024 745th solisolu 736 72 4ms 19 Nov 2025 750th dokutan 735 92 439ms 15 Jul 2025 751st rucin93 🇵🇱 734 63 9ms 18 Nov 2025 752nd snoozingnewt 🇨🇦 733 118 261ms 9 Oct 2025 753rd h3ra993huskp 🇯🇵 732 94 488ms 19 days ago 754th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 755th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 756th MaxElf999 730 68 17ms 21 Nov 2022 756th guilhem-roy 🇫🇷 730 68 16ms 21 Nov 2022 756th knutae 🇳🇴 730 68 18ms 30 Nov 2022 756th 4ndyJ 🇬🇧 730 68 16ms 10 Jan 2023 756th andre-lameirinhas 🇵🇹 730 68 17ms 18 May 2023 756th WillConker 730 68 20ms 16 Jul 2023 756th AforAmpere 730 68 16ms 20 Sep 2023 756th Simpos 730 68 30ms 24 Oct 2023 756th mikehanus 730 68 19ms 22 Nov 2023 756th chartung17 730 68 17ms 31 Dec 2023 756th mathisfun271 730 68 23ms 13 Feb 2024 756th 77Tigers 730 68 16ms 22 Jun 2024 756th moustave 730 68 17ms 12 Nov 2024 769th MeWhenI 🇻🇦 729 57 387ms 14 Feb 2023 769th masflam 729 57 431ms 21 Jun 2024 771st dokutan 727 33 36ms 20 Oct 2024 772nd annaproxy 727 85 243ms 22 Nov 2022 772nd Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 774th emgordon154 726 119 255ms 19 Mar 2025 775th Chinay-Domitrix 🇺🇸 725 71 4,937ms 2 Apr 2025 776th jared-hughes 724 61 12ms 20 Nov 2022 776th janbehrens 🇩🇪 724 61 12ms 20 Nov 2022 776th tayloia 🇬🇧 724 61 11ms 9 Jan 2023 776th iczelia 🇩🇪 724 61 12ms 5 Nov 2025 780th msbranicky 723 63 570ms 16 Jan 2024 781st Shanethegamer 🇺🇸 722 73 57ms 18 Dec 2023 781st steffan-polygolf 722 73 25ms 7 Mar 2024 783rd primo-ppcg 🇹🇭 721 43 352ms 20 Nov 2022 784th snoozingnewt 🇨🇦 720 68 119ms 8 Oct 2023 784th rboath 720 68 2,066ms 11 Dec 2024 786th juliusgeo 720 69 16ms 13 Jan 2023 786th jhu04 720 69 19ms 18 Jan 2024 786th ImpressedByRocks 720 69 16ms 15 Nov 2024 789th prplz 🇦🇺 718 86 243ms 16 Jan 2023 790th alemelis 717 58 539ms 29 Aug 2024 791st error256 716 55 59ms 4 Jun 2024 792nd Alex-x90 🇺🇸 716 74 4ms 20 Nov 2022 792nd jared-hughes 716 74 4ms 20 Nov 2022 794th MeWhenI 🇻🇦 715 36 421ms 30 Dec 2023 795th dokutan 715 72 2,687ms 4 days ago 796th edsrzf 🇳🇿 715 82 29ms 9 Sep 2025 797th syntax-rules 714 75 52ms 15 May 2023 798th Alex-x90 🇺🇸 713 62 12ms 14 Jan 2023 798th m-tkach 🇺🇦 713 62 13ms 20 Mar 2023 798th emgordon154 713 62 12ms 19 Mar 2025 First Prev 721–800 of 1,799 Next Last