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 881st janbehrens 🇩🇪 670 79 4ms 20 Nov 2022 881st weliveinhell 🇭🇹 670 79 4ms 21 May 2024 883rd kkoenig 670 129 282ms 2 Jan 2024 883rd dokutan 670 129 315ms 10 Mar 2025 885th Steffan153 🇫🇮 668 71 5ms 20 Nov 2022 886th ejini6969 667 59 53ms 14 Jun 2025 887th MeWhenI 🇻🇦 666 79 95ms 7 Aug 2023 888th namcartoon06 666 110 59ms 15 Jul 2023 889th dokutan 664 66 139ms 7 Aug 2024 890th snoozingnewt 🇨🇦 663 102 417ms 9 Oct 2025 891st CedricGebistorf 662 75 24ms 4 May 2023 891st namelessiw 662 75 26ms 11 Jan 2024 891st robin-scragg 662 75 25ms 25 Jun 2025 894th Yewzir 🇧🇪 662 80 4ms 12 Feb 2024 894th dokutan 662 80 4ms 23 Mar 2024 896th snoozingnewt 🇨🇦 661 71 10ms 9 Oct 2025 897th Steffan153 🇫🇮 661 251 53ms 2 Aug 2023 898th JRaspass 🇬🇧 660 43 159ms 19 Nov 2022 898th SirBogman 🇺🇸 660 43 210ms 20 Nov 2022 900th SirBogman 🇺🇸 660 51 903ms 22 Nov 2022 900th janbehrens 🇩🇪 660 51 1,065ms 27 Nov 2022 902nd fuzzylojik-golf 🇺🇸 660 67 41ms 9 Jul 2025 902nd snoozingnewt 🇨🇦 660 67 16ms 9 Oct 2025 904th dokutan 660 70 9ms 19 Nov 2025 905th msbranicky 658 80 79ms 10 Sep 2023 906th MeWhenI 🇻🇦 656 171 1,690ms 7 Nov 2025 907th SirBogman 🇺🇸 656 253 79ms 22 Nov 2022 908th albanian-laundromat 655 192 640ms 20 Oct 2025 909th aksyristos 654 112 61ms 23 Jan 2023 910th MeWhenI 🇻🇦 654 121 14ms 9 Apr 2024 911th jacksonhenry3 653 76 23ms 2 Dec 2022 911th Irratix 🇳🇱 653 76 23ms 31 Jan 2023 911th NoahBolohan 🇨🇦 653 76 27ms 8 Feb 2023 911th Andrey2001 653 76 23ms 14 days ago 915th stefangimmillaro 652 86 105ms 20 Nov 2022 916th MeWhenI 🇻🇦 652 105 122ms 9 Apr 2024 917th epic-programmer-guy 651 70 589ms 15 Apr 2024 917th Stockoh 🇫🇷 651 70 565ms 24 Jun 2024 919th MeWhenI 🇻🇦 651 71 8ms 10 Oct 2023 920th MeWhenI 🇻🇦 651 72 7ms 9 Apr 2024 921st Maznek 650 68 12ms 3 Jul 2023 922nd akamayu-ouo 🇹🇼 649 37 3ms 30 Jul 2024 923rd MeWhenI 🇻🇦 648 52 1,052ms 12 May 2023 924th dokutan 646 98 395ms 21 days ago 925th Yewzir 🇧🇪 645 61 48ms 14 Feb 2024 925th lacrosse 645 61 50ms 25 days ago 927th GolfingSuccess 🇬🇷 645 195 489ms 19 Jan 2025 928th albanian-laundromat 643 96 45ms 22 Aug 2025 929th Betuaredead 643 114 1,423ms 8 Jan 2023 930th Jacob385 642 71 377ms 18 Apr 2024 931st MeWhenI 🇻🇦 642 92 45ms 14 Feb 2025 931st AlephSquirrel 642 92 48ms 21 Mar 2025 933rd sean-niemann 🇺🇸 641 74 6ms 4 Apr 2023 934th MeWhenI 🇻🇦 641 89 128ms 27 Jul 2024 935th NickTheEASDude 🇺🇸 640 69 12ms 1 May 2024 936th Shanethegamer 🇺🇸 640 121 31ms 31 Mar 2025 937th inventshah 640 155 3,614ms 23 Mar 2023 937th retrohun 640 155 154ms 27 Sep 2025 939th emgordon154 638 83 5ms 20 Mar 2025 939th iczelia 🇩🇪 638 83 4ms 5 Nov 2025 941st Yewzir 🇧🇪 637 67 788ms 15 Nov 2025 942nd Europe2048 637 78 32ms 4 Dec 2024 943rd dokutan 637 88 102ms 2 May 2024 943rd snoozingnewt 🇨🇦 637 88 103ms 9 Oct 2025 945th HumanoidCPU 637 108 441ms 8 Nov 2025 946th retrohun 637 115 62ms 28 Dec 2022 947th KatieLG 🇬🇧 635 62 47ms 2 Oct 2025 948th dokutan 634 177 1,654ms 2 Nov 2025 949th UnderKoen 🇳🇱 633 125 551ms 20 Apr 2023 950th janbehrens 🇩🇪 632 76 221ms 20 Nov 2022 951st Yewzir 🇧🇪 631 56 4ms 14 Feb 2024 952nd eranws 631 70 12ms 23 Dec 2024 953rd jared-hughes 631 81 11ms 20 Nov 2022 954th Yax42 🇫🇷 631 84 4ms 15 Oct 2025 955th msbranicky 631 116 61ms 15 Sep 2023 956th MeWhenI 🇻🇦 630 89 102ms 9 Apr 2024 957th cbrt-x 630 98 182ms 30 Aug 2024 958th Yewzir 🇧🇪 628 41 109ms 23 Feb 2024 959th emgordon154 628 126 271ms 10 Jun 2025 960th dokutan 627 78 134ms 26 Jul 2024 First Prev 881–960 of 1,799 Next Last