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 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 720th Argeento 🇵🇱 749 59 12ms 26 Aug 2023 720th DialFrost 🇸🇬 749 59 12ms 5 days ago 720th error256 749 59 15ms 4 hours ago 724th tigerdan2 🇩🇪 748 92 450ms 24 days ago 725th Natanaelel 🇸🇪 747 38 227ms 5 Jan 2024 726th MeWhenI 🇻🇦 747 98 56ms 9 Apr 2024 726th snoozingnewt 🇨🇦 747 98 411ms 6 Oct 2025 728th m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 729th msbranicky 745 92 123ms 1 Oct 2023 730th janbehrens 🇩🇪 745 116 274ms 20 Nov 2022 731st janbehrens 🇩🇪 744 63 14ms 20 Nov 2022 732nd Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 733rd Kaffeleif 743 71 24ms 8 Feb 2024 733rd DialFrost 🇸🇬 743 71 24ms 15 Dec 2024 733rd snoozingnewt 🇨🇦 743 71 28ms 9 Oct 2025 736th dokutan 742 92 26ms 24 Nov 2025 737th bob-th 741 67 17ms 23 Dec 2022 737th n0Oo0Oo0b 741 67 18ms 29 Dec 2022 737th betaveros 741 67 32ms 31 Dec 2022 737th vgamula 🇺🇦 741 67 17ms 15 Mar 2023 737th HumanoidCPU 741 67 22ms 19 Feb 2025 737th VictorStenvers 🇳🇱 741 67 18ms 26 Mar 2025 743rd janbehrens 🇩🇪 740 99 61ms 20 Nov 2022 743rd Yewzir 🇧🇪 740 99 65ms 12 Feb 2024 745th Steffan153 🇫🇮 738 65 1,452ms 14 Jan 2023 746th thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 746th stefangimmillaro 737 60 12ms 4 Sep 2024 746th targrik 737 60 12ms 6 Feb 2025 746th Lv0Sys 🇵🇱 737 60 13ms 17 days ago 750th m-tkach 🇺🇦 736 72 4ms 22 Nov 2022 750th emplv 🇱🇻 736 72 4ms 30 Nov 2022 750th Steffan153 🇫🇮 736 72 4ms 3 Jan 2023 750th sean-niemann 🇺🇸 736 72 5ms 7 May 2024 750th solisolu 736 72 4ms 19 Nov 2025 755th dokutan 735 92 439ms 15 Jul 2025 756th rucin93 🇵🇱 734 63 9ms 18 Nov 2025 757th snoozingnewt 🇨🇦 733 118 261ms 9 Oct 2025 758th h3ra993huskp 🇯🇵 732 94 488ms 24 days ago 759th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 760th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 761st MaxElf999 730 68 17ms 21 Nov 2022 761st guilhem-roy 🇫🇷 730 68 16ms 21 Nov 2022 761st knutae 🇳🇴 730 68 18ms 30 Nov 2022 761st 4ndyJ 🇬🇧 730 68 16ms 10 Jan 2023 761st andre-lameirinhas 🇵🇹 730 68 17ms 18 May 2023 761st WillConker 730 68 20ms 16 Jul 2023 761st AforAmpere 730 68 16ms 20 Sep 2023 761st Simpos 730 68 30ms 24 Oct 2023 761st mikehanus 730 68 19ms 22 Nov 2023 761st chartung17 730 68 17ms 31 Dec 2023 761st mathisfun271 730 68 23ms 13 Feb 2024 761st 77Tigers 730 68 16ms 22 Jun 2024 761st moustave 730 68 17ms 12 Nov 2024 774th MeWhenI 🇻🇦 729 57 357ms 14 Feb 2023 774th masflam 729 57 292ms 21 Jun 2024 776th dokutan 727 33 36ms 20 Oct 2024 777th annaproxy 727 85 243ms 22 Nov 2022 777th Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 779th emgordon154 726 119 255ms 19 Mar 2025 780th jared-hughes 725 61 12ms 20 Nov 2022 780th janbehrens 🇩🇪 725 61 12ms 20 Nov 2022 780th tayloia 🇬🇧 725 61 11ms 9 Jan 2023 780th iczelia 🇩🇪 725 61 12ms 5 Nov 2025 784th Chinay-Domitrix 🇺🇸 725 71 2,965ms 2 Apr 2025 785th msbranicky 723 63 570ms 16 Jan 2024 786th Shanethegamer 🇺🇸 723 73 57ms 18 Dec 2023 786th steffan-polygolf 723 73 25ms 7 Mar 2024 788th primo-ppcg 🇹🇭 721 43 326ms 20 Nov 2022 789th snoozingnewt 🇨🇦 720 68 119ms 8 Oct 2023 789th rboath 720 68 2,066ms 11 Dec 2024 791st juliusgeo 720 69 16ms 13 Jan 2023 791st jhu04 720 69 19ms 18 Jan 2024 791st ImpressedByRocks 720 69 16ms 15 Nov 2024 794th prplz 🇦🇺 718 86 243ms 16 Jan 2023 795th alemelis 717 58 412ms 29 Aug 2024 796th Alex-x90 🇺🇸 716 74 4ms 20 Nov 2022 796th jared-hughes 716 74 4ms 20 Nov 2022 798th MeWhenI 🇻🇦 715 36 328ms 30 Dec 2023 799th dokutan 715 72 2,687ms 9 days ago 800th edsrzf 🇳🇿 715 82 29ms 9 Sep 2025 First Prev 721–800 of 1,803 Next Last