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 881st emgordon154 674 87 34ms 19 Mar 2025 882nd annaproxy 673 94 356ms 22 Oct 2023 883rd gjoacorp 🇬🇧 672 109 62ms 4 Aug 2025 884th Anthony-Williams-06 671 74 17ms 12 Sep 2024 885th helbling 🇨🇭 670 66 11ms 5 Apr 2024 886th janbehrens 🇩🇪 670 79 4ms 20 Nov 2022 886th weliveinhell 🇭🇹 670 79 4ms 21 May 2024 888th kkoenig 670 129 282ms 2 Jan 2024 888th dokutan 670 129 315ms 10 Mar 2025 890th Steffan153 🇫🇮 668 71 5ms 20 Nov 2022 891st ejini6969 667 59 59ms 14 Jun 2025 892nd MeWhenI 🇻🇦 666 79 95ms 7 Aug 2023 893rd namcartoon06 666 110 59ms 15 Jul 2023 894th dokutan 664 66 139ms 7 Aug 2024 895th snoozingnewt 🇨🇦 663 102 417ms 9 Oct 2025 896th CedricGebistorf 662 75 24ms 4 May 2023 896th namelessiw 662 75 26ms 11 Jan 2024 896th robin-scragg 662 75 25ms 25 Jun 2025 899th Yewzir 🇧🇪 662 80 4ms 12 Feb 2024 899th dokutan 662 80 4ms 23 Mar 2024 901st SirBogman 🇺🇸 661 51 903ms 22 Nov 2022 901st janbehrens 🇩🇪 661 51 1,065ms 27 Nov 2022 903rd dokutan 661 70 9ms 19 Nov 2025 904th snoozingnewt 🇨🇦 661 71 8ms 9 Oct 2025 905th Steffan153 🇫🇮 661 251 53ms 2 Aug 2023 906th JRaspass 🇬🇧 660 43 159ms 19 Nov 2022 906th SirBogman 🇺🇸 660 43 194ms 20 Nov 2022 908th fuzzylojik-golf 🇺🇸 660 67 41ms 9 Jul 2025 908th snoozingnewt 🇨🇦 660 67 16ms 9 Oct 2025 910th msbranicky 658 80 79ms 10 Sep 2023 911th MeWhenI 🇻🇦 656 171 1,690ms 7 Nov 2025 912th SirBogman 🇺🇸 656 253 79ms 22 Nov 2022 913th albanian-laundromat 655 192 536ms 20 Oct 2025 914th aksyristos 654 112 61ms 23 Jan 2023 915th MeWhenI 🇻🇦 654 121 14ms 9 Apr 2024 916th jacksonhenry3 653 76 23ms 2 Dec 2022 916th Irratix 🇳🇱 653 76 23ms 31 Jan 2023 916th NoahBolohan 🇨🇦 653 76 27ms 8 Feb 2023 916th Andrey2001 653 76 23ms 17 days ago 920th MeWhenI 🇻🇦 652 71 8ms 10 Oct 2023 921st stefangimmillaro 652 86 105ms 20 Nov 2022 922nd MeWhenI 🇻🇦 652 105 122ms 9 Apr 2024 923rd epic-programmer-guy 651 70 589ms 15 Apr 2024 923rd Stockoh 🇫🇷 651 70 565ms 24 Jun 2024 925th MeWhenI 🇻🇦 651 72 7ms 9 Apr 2024 926th Maznek 650 68 12ms 3 Jul 2023 927th akamayu-ouo 🇹🇼 649 37 3ms 30 Jul 2024 928th MeWhenI 🇻🇦 648 52 1,052ms 12 May 2023 929th dokutan 646 98 395ms 23 days ago 930th Yewzir 🇧🇪 645 61 56ms 14 Feb 2024 930th lacrosse 645 61 57ms 27 days ago 932nd GolfingSuccess 🇬🇷 645 195 489ms 19 Jan 2025 933rd albanian-laundromat 643 96 45ms 22 Aug 2025 934th Betuaredead 643 114 1,423ms 8 Jan 2023 935th Jacob385 642 71 377ms 18 Apr 2024 936th MeWhenI 🇻🇦 642 92 45ms 14 Feb 2025 936th AlephSquirrel 642 92 48ms 21 Mar 2025 938th NickTheEASDude 🇺🇸 641 69 12ms 1 May 2024 939th sean-niemann 🇺🇸 641 74 6ms 4 Apr 2023 940th MeWhenI 🇻🇦 641 89 128ms 27 Jul 2024 941st Shanethegamer 🇺🇸 640 121 31ms 31 Mar 2025 942nd inventshah 640 155 3,614ms 23 Mar 2023 942nd retrohun 640 155 154ms 27 Sep 2025 944th emgordon154 638 83 5ms 20 Mar 2025 944th iczelia 🇩🇪 638 83 4ms 5 Nov 2025 946th Yewzir 🇧🇪 637 67 788ms 15 Nov 2025 947th Europe2048 637 78 32ms 4 Dec 2024 948th dokutan 637 88 102ms 2 May 2024 948th snoozingnewt 🇨🇦 637 88 103ms 9 Oct 2025 950th HumanoidCPU 637 108 441ms 8 Nov 2025 951st retrohun 637 115 62ms 28 Dec 2022 952nd KatieLG 🇬🇧 635 62 48ms 2 Oct 2025 953rd dokutan 634 177 1,654ms 2 Nov 2025 954th UnderKoen 🇳🇱 633 125 551ms 20 Apr 2023 955th janbehrens 🇩🇪 632 76 221ms 20 Nov 2022 956th Yewzir 🇧🇪 631 56 4ms 14 Feb 2024 957th eranws 631 70 12ms 23 Dec 2024 958th jared-hughes 631 81 10ms 20 Nov 2022 959th Yax42 🇫🇷 631 84 4ms 15 Oct 2025 960th msbranicky 631 116 61ms 15 Sep 2023 First Prev 881–960 of 1,804 Next Last