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 399th dokutan 878 60 22ms 9 May 2024 399th edsrzf 🇳🇿 878 60 25ms 5 Jan 2025 399th kg583 🇺🇸 878 60 24ms 31 Jul 2025 399th sean-niemann 🇺🇸 878 60 24ms 17 Aug 2025 405th GrayJoKing 🇦🇺 878 65 130ms 26 Oct 2023 406th snoozingnewt 🇨🇦 878 78 124ms 9 Oct 2025 407th canissimia 🇦🇶 878 113 553ms 13 Dec 2022 408th snoozingnewt 🇨🇦 877 60 100ms 9 Oct 2025 409th JayXon 🇺🇸 877 128 1,668ms 15 Sep 2025 410th commandblockguy 🇺🇸 876 52 321ms 15 Jan 2024 411th DialFrost 🇸🇬 876 55 18ms 24 Mar 2025 412th Andriamanitra 🇫🇮 875 45 46ms 17 Jul 2023 413th DialFrost 🇸🇬 874 144 564ms 28 Mar 2025 413th pardouin 🇫🇷 874 144 462ms 23 Apr 2025 415th jared-hughes 874 160 48ms 21 Jul 2023 416th primo-ppcg 🇹🇭 873 55 37ms 20 Nov 2022 417th DialFrost 🇸🇬 873 92 394ms 16 days ago 418th primo-ppcg 🇹🇭 873 99 275ms 20 Nov 2022 419th stefangimmillaro 872 57 41ms 20 Nov 2022 419th marshallward 🇺🇸 872 57 42ms 21 Nov 2022 419th Steffan153 🇫🇮 872 57 43ms 30 Jan 2023 419th DialFrost 🇸🇬 872 57 42ms 22 Oct 2024 423rd sisyphus-ppcg 🇦🇺 872 79 403ms 23 days ago 424th thehylian 871 57 16ms 2 Jan 2023 424th FlorianCassayre 🇫🇷 871 57 17ms 18 Jan 2023 424th bricknellj 871 57 16ms 17 Mar 2023 424th davecame 871 57 26ms 2 Oct 2023 424th Betuaredead 871 57 16ms 13 Nov 2023 424th Bulmenisaurus 871 57 17ms 21 Jul 2024 424th ryyyn 🇺🇸 871 57 24ms 25 Jun 2025 424th AdrienHache 🇫🇷 871 57 24ms 23 hours ago 432nd pardouin 🇫🇷 868 70 1,261ms 23 Apr 2025 433rd emgordon154 868 145 453ms 19 Mar 2025 434th ovs-code 🇩🇪 868 161 49ms 23 May 2025 435th codewrite 🇬🇧 867 73 375ms 11 Jul 2025 435th fuzzylojik-golf 🇺🇸 867 73 414ms 8 Sep 2025 437th MeWhenI 🇻🇦 867 88 222ms 9 Apr 2024 438th Shanethegamer 🇺🇸 866 48 538ms 21 Nov 2022 439th Steffan153 🇫🇮 866 78 427ms 17 Feb 2023 439th sean-niemann 🇺🇸 866 78 420ms 20 May 2023 439th fuzzylojik-golf 🇺🇸 866 78 507ms 20 Aug 2025 442nd primo-ppcg 🇹🇭 865 192 37ms 13 Aug 2025 443rd Steffan153 🇫🇮 864 79 24ms 21 Feb 2023 443rd Lydxn 🇨🇦 864 79 25ms 22 Feb 2023 443rd m-tkach 🇺🇦 864 79 24ms 15 Mar 2023 443rd sean-niemann 🇺🇸 864 79 25ms 14 Jan 2025 447th Shanethegamer 🇺🇸 863 39 915ms 21 Nov 2022 447th snoozingnewt 🇨🇦 863 39 781ms 23 Oct 2025 449th inventshah 862 85 81ms 29 Nov 2022 449th xsot 🇸🇬 862 85 60ms 28 Apr 2024 451st saito-ta 🇯🇵 861 41 11ms 24 Dec 2024 452nd annaproxy 861 56 16ms 8 Jan 2023 452nd sean-niemann 🇺🇸 861 56 16ms 25 Mar 2025 454th kmathis22 861 80 446ms 28 Oct 2025 455th SirBogman 🇺🇸 860 53 370ms 20 Jan 2024 455th MeWhenI 🇻🇦 860 53 373ms 13 Jul 2024 455th snoozingnewt 🇨🇦 860 53 358ms 17 days ago 458th Steffan153 🇫🇮 859 67 128ms 22 Nov 2022 459th stefangimmillaro 858 30 348ms 20 Nov 2022 460th lynn 858 72 246ms 27 Jan 2023 461st rak1507 🇬🇧 857 28 39ms 27 Jan 2023 461st lifthrasiir 🇰🇷 857 28 3ms 27 Nov 2024 463rd ovs-code 🇩🇪 857 131 1,696ms 14 Sep 2025 464th primo-ppcg 🇹🇭 856 46 58ms 20 Nov 2022 464th Shanethegamer 🇺🇸 856 46 57ms 21 Nov 2022 466th Steffan153 🇫🇮 856 52 63ms 12 Aug 2024 466th ovs-code 🇩🇪 856 52 55ms 10 Oct 2024 468th za3k 856 58 18ms 20 Nov 2022 468th MeWhenI 🇻🇦 856 58 17ms 10 Oct 2023 468th marcin7Cd 856 58 16ms 28 Apr 2025 468th jipsong 🇩🇪 856 58 23ms 20 Jun 2025 472nd edsrzf 🇳🇿 856 73 47ms 9 Sep 2025 473rd emplv 🇱🇻 853 80 24ms 30 Nov 2022 474th Steffan153 🇫🇮 852 86 59ms 14 Jan 2023 474th tailorspy 852 86 65ms 24 May 2024 474th snyderek 🇺🇸 852 86 57ms 13 Oct 2024 477th kg583 🇺🇸 850 63 49ms 26 Aug 2025 478th Liibe 850 81 440ms 25 Sep 2025 478th Yax42 🇫🇷 850 81 447ms 6 Oct 2025 478th MeWhenI 🇻🇦 850 81 547ms 7 Nov 2025 First Prev 401–480 of 1,799 Next Last