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 638th TaserTheFox 🇺🇸 776 64 16ms 14 Jan 2023 638th jmerle 🇳🇱 776 64 16ms 16 Feb 2023 638th vishwathg 776 64 16ms 7 Apr 2023 638th dteague3989 776 64 16ms 8 Aug 2023 638th NickTheEASDude 🇺🇸 776 64 23ms 1 May 2024 638th aalec 776 64 16ms 3 May 2024 638th mishak-sys 776 64 16ms 25 Feb 2025 638th YAJUE114514 776 64 15ms 1 Aug 2025 638th Deedogg 776 64 16ms 30 Oct 2025 650th Yewzir 🇧🇪 776 88 25ms 13 Feb 2024 651st Steffan153 🇫🇮 775 57 12ms 14 Jan 2023 651st sisyphus-ppcg 🇦🇺 775 57 11ms 20 Jul 2023 653rd pardouin 🇫🇷 775 68 33ms 24 Apr 2025 654th rak1507 🇬🇧 774 31 2ms 7 Jan 2023 654th Yewzir 🇧🇪 774 31 9ms 9 Dec 2023 654th snoozingnewt 🇨🇦 774 31 37ms 20 Sep 2025 657th DialFrost 🇸🇬 773 181 52ms 23 May 2025 658th GolfingSuccess 🇬🇷 772 59 344ms 15 Jan 2024 658th albanian-laundromat 772 59 335ms 8 Oct 2025 660th pardouin 🇫🇷 772 76 10ms 24 Apr 2025 661st DialFrost 🇸🇬 772 80 184ms 5 Aug 2024 662nd emgordon154 772 104 115ms 19 days ago 663rd dokutan 771 95 71ms 23 Mar 2024 664th dokutan 770 54 377ms 9 Apr 2024 664th snoozingnewt 🇨🇦 770 54 304ms 9 days ago 666th emplv 🇱🇻 769 61 7ms 21 Jun 2023 667th Yewzir 🇧🇪 769 68 123ms 14 Feb 2024 668th ovs-code 🇩🇪 768 69 5ms 10 Feb 2024 669th SirFireball3521 767 37 354ms 13 Mar 2023 670th fourth-bit 764 65 19ms 11 Jul 2023 670th Bmrl7 764 65 18ms 24 Feb 2024 670th shelerr 764 65 26ms 22 Aug 2025 673rd Irratix 🇳🇱 763 96 57ms 11 Dec 2022 674th AlephSquirrel 762 58 116ms 1 Jun 2023 675th JGDoerrer 761 90 125ms 20 Dec 2022 675th klixel 🇨🇦 761 90 124ms 17 Apr 2023 675th TylerBloom 761 90 118ms 22 Mar 2024 675th Aurel300 🇨🇭 761 90 119ms 8 Jun 2024 679th steffan-polygolf 759 60 377ms 7 Mar 2024 680th ovs-code 🇩🇪 759 70 23ms 14 Dec 2024 681st lynn 759 102 31ms 18 Jul 2023 681st m-tkach 🇺🇦 759 102 31ms 7 Dec 2023 683rd janbehrens 🇩🇪 757 52 46ms 27 Nov 2022 684th SirBogman 🇺🇸 756 41 332ms 9 Jan 2024 684th dcgjb 756 41 1,753ms 31 Jan 2024 684th IISResetMe 756 41 313ms 10 Apr 2024 684th juliansiebert 🇩🇪 756 41 326ms 2 Feb 2025 688th DialFrost 🇸🇬 755 71 48ms 7 Dec 2024 689th Alex-x90 🇺🇸 755 97 66ms 20 Nov 2022 690th MeWhenI 🇻🇦 753 66 41ms 14 May 2023 691st aksyristos 752 66 19ms 17 Jan 2023 691st OllieBoyne 🇬🇧 752 66 19ms 28 Feb 2023 691st randolchance 752 66 19ms 12 Mar 2023 691st CheeseCake628 🇳🇴 752 66 18ms 19 Mar 2023 691st adamnielson42 🇺🇸 752 66 17ms 31 Mar 2023 691st ehulinsky 🇺🇸 752 66 18ms 8 May 2023 691st TheoKeller1 752 66 17ms 11 Jun 2023 691st dranjohn 752 66 16ms 11 Sep 2023 691st inverseLorentz 🇦🇺 752 66 19ms 23 Oct 2023 691st RedzGoose 🇦🇺 752 66 19ms 23 Oct 2024 691st JunkIce 752 66 21ms 24 Nov 2024 691st yokasuretsu 752 66 17ms 7 Jan 2025 691st croc54 752 66 17ms 13 Jan 2025 691st ejini6969 752 66 17ms 14 Jun 2025 691st osNiko 🇧🇷 752 66 17ms 20 Aug 2025 691st Troon 752 66 24ms 22 Aug 2025 707th Steffan153 🇫🇮 752 78 35ms 14 Jul 2023 707th GrayJoKing 🇦🇺 752 78 41ms 13 Aug 2023 707th kg583 🇺🇸 752 78 31ms 2 Oct 2025 710th Yewzir 🇧🇪 751 90 435ms 12 Feb 2024 711th dokutan 750 32 3ms 14 Nov 2024 712th retrohun 750 64 4,903ms 5 Nov 2023 713th Shanethegamer 🇺🇸 750 81 1,252ms 30 Nov 2022 714th inventshah 749 59 11ms 20 Nov 2022 714th Argeento 🇵🇱 749 59 12ms 26 Aug 2023 716th tigerdan2 🇩🇪 748 92 450ms 18 days ago 717th Natanaelel 🇸🇪 747 38 273ms 5 Jan 2024 718th MeWhenI 🇻🇦 747 98 73ms 9 Apr 2024 718th snoozingnewt 🇨🇦 747 98 488ms 6 Oct 2025 720th m-tkach 🇺🇦 747 106 43ms 13 Mar 2023 First Prev 641–720 of 1,799 Next Last