The Calendar hole will go live in approximately 5 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 inventshah 749 59 11ms 20 Nov 2022 721st Argeento 🇵🇱 749 59 12ms 26 Aug 2023 721st DialFrost 🇸🇬 749 59 12ms 7 days ago 721st error256 749 59 15ms 40 hours ago 725th tigerdan2 🇩🇪 748 92 450ms 26 days ago 726th Natanaelel 🇸🇪 747 38 227ms 5 Jan 2024 727th MeWhenI 🇻🇦 747 98 56ms 9 Apr 2024 727th snoozingnewt 🇨🇦 747 98 411ms 6 Oct 2025 729th m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 730th msbranicky 745 92 123ms 1 Oct 2023 731st janbehrens 🇩🇪 745 116 274ms 20 Nov 2022 732nd janbehrens 🇩🇪 744 63 14ms 20 Nov 2022 733rd Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 734th Kaffeleif 743 71 24ms 8 Feb 2024 734th DialFrost 🇸🇬 743 71 24ms 15 Dec 2024 734th snoozingnewt 🇨🇦 743 71 28ms 9 Oct 2025 737th dokutan 742 92 26ms 24 Nov 2025 738th bob-th 741 67 17ms 23 Dec 2022 738th n0Oo0Oo0b 741 67 18ms 29 Dec 2022 738th betaveros 741 67 32ms 31 Dec 2022 738th vgamula 🇺🇦 741 67 17ms 15 Mar 2023 738th HumanoidCPU 741 67 22ms 19 Feb 2025 738th VictorStenvers 🇳🇱 741 67 18ms 26 Mar 2025 744th janbehrens 🇩🇪 740 99 61ms 20 Nov 2022 744th Yewzir 🇧🇪 740 99 65ms 12 Feb 2024 746th Steffan153 🇫🇮 738 65 1,452ms 14 Jan 2023 747th thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 747th stefangimmillaro 737 60 12ms 4 Sep 2024 747th targrik 737 60 12ms 6 Feb 2025 747th Lv0Sys 🇵🇱 737 60 13ms 18 days ago 751st m-tkach 🇺🇦 736 72 4ms 22 Nov 2022 751st emplv 🇱🇻 736 72 4ms 30 Nov 2022 751st Steffan153 🇫🇮 736 72 4ms 3 Jan 2023 751st sean-niemann 🇺🇸 736 72 5ms 7 May 2024 751st solisolu 736 72 4ms 19 Nov 2025 756th rucin93 🇵🇱 735 63 9ms 18 Nov 2025 757th dokutan 735 92 439ms 15 Jul 2025 758th snoozingnewt 🇨🇦 733 118 261ms 9 Oct 2025 759th h3ra993huskp 🇯🇵 732 94 488ms 26 days ago 760th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 761st GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 762nd MaxElf999 730 68 17ms 21 Nov 2022 762nd guilhem-roy 🇫🇷 730 68 16ms 21 Nov 2022 762nd knutae 🇳🇴 730 68 18ms 30 Nov 2022 762nd 4ndyJ 🇬🇧 730 68 16ms 10 Jan 2023 762nd andre-lameirinhas 🇵🇹 730 68 17ms 18 May 2023 762nd WillConker 730 68 20ms 16 Jul 2023 762nd AforAmpere 730 68 16ms 20 Sep 2023 762nd Simpos 730 68 30ms 24 Oct 2023 762nd mikehanus 730 68 19ms 22 Nov 2023 762nd chartung17 730 68 17ms 31 Dec 2023 762nd mathisfun271 730 68 23ms 13 Feb 2024 762nd 77Tigers 730 68 16ms 22 Jun 2024 762nd moustave 730 68 17ms 12 Nov 2024 775th MeWhenI 🇻🇦 729 57 357ms 14 Feb 2023 775th masflam 729 57 292ms 21 Jun 2024 777th dokutan 727 33 36ms 20 Oct 2024 778th annaproxy 727 85 243ms 22 Nov 2022 778th Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 780th emgordon154 726 119 255ms 19 Mar 2025 781st jared-hughes 725 61 12ms 20 Nov 2022 781st janbehrens 🇩🇪 725 61 12ms 20 Nov 2022 781st tayloia 🇬🇧 725 61 11ms 9 Jan 2023 781st iczelia 🇩🇪 725 61 12ms 5 Nov 2025 785th Chinay-Domitrix 🇺🇸 725 71 2,965ms 2 Apr 2025 786th msbranicky 723 63 570ms 16 Jan 2024 787th Shanethegamer 🇺🇸 723 73 57ms 18 Dec 2023 787th steffan-polygolf 723 73 25ms 7 Mar 2024 789th primo-ppcg 🇹🇭 721 43 326ms 20 Nov 2022 790th snoozingnewt 🇨🇦 720 68 119ms 8 Oct 2023 790th rboath 720 68 2,066ms 11 Dec 2024 792nd juliusgeo 720 69 16ms 13 Jan 2023 792nd jhu04 720 69 19ms 18 Jan 2024 792nd ImpressedByRocks 720 69 16ms 15 Nov 2024 795th prplz 🇦🇺 718 86 243ms 16 Jan 2023 796th alemelis 717 58 412ms 29 Aug 2024 797th Alex-x90 🇺🇸 716 74 4ms 20 Nov 2022 797th jared-hughes 716 74 4ms 20 Nov 2022 799th MeWhenI 🇻🇦 715 36 315ms 30 Dec 2023 800th dokutan 715 72 2,687ms 10 days ago First Prev 721–800 of 1,804 Next Last