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 640th emplv 🇱🇻 778 72 100ms 30 Nov 2022 642nd albanian-laundromat 776 55 774ms 12 Sep 2025 643rd jakobkordez 🇸🇮 776 64 2,278ms 20 Nov 2022 643rd nstearns96 🇬🇧 776 64 245ms 23 Nov 2022 643rd Bodo171 776 64 16ms 27 Nov 2022 643rd TaserTheFox 🇺🇸 776 64 16ms 14 Jan 2023 643rd jmerle 🇳🇱 776 64 16ms 16 Feb 2023 643rd vishwathg 776 64 16ms 7 Apr 2023 643rd dteague3989 776 64 16ms 8 Aug 2023 643rd NickTheEASDude 🇺🇸 776 64 23ms 1 May 2024 643rd aalec 776 64 16ms 3 May 2024 643rd mishak-sys 776 64 16ms 25 Feb 2025 643rd YAJUE114514 776 64 15ms 1 Aug 2025 643rd Deedogg 776 64 16ms 30 Oct 2025 655th pardouin 🇫🇷 776 68 33ms 24 Apr 2025 656th Yewzir 🇧🇪 776 88 25ms 13 Feb 2024 657th Steffan153 🇫🇮 775 57 12ms 14 Jan 2023 657th sisyphus-ppcg 🇦🇺 775 57 11ms 20 Jul 2023 659th rak1507 🇬🇧 774 31 2ms 7 Jan 2023 659th Yewzir 🇧🇪 774 31 9ms 9 Dec 2023 659th snoozingnewt 🇨🇦 774 31 37ms 20 Sep 2025 662nd DialFrost 🇸🇬 773 181 52ms 23 May 2025 663rd GolfingSuccess 🇬🇷 772 59 344ms 15 Jan 2024 663rd albanian-laundromat 772 59 335ms 8 Oct 2025 665th pardouin 🇫🇷 772 76 10ms 24 Apr 2025 666th DialFrost 🇸🇬 772 80 184ms 5 Aug 2024 667th emgordon154 772 104 112ms 25 days ago 668th dokutan 771 95 60ms 23 Mar 2024 669th dokutan 770 54 293ms 9 Apr 2024 669th snoozingnewt 🇨🇦 770 54 279ms 15 days ago 671st emplv 🇱🇻 769 61 8ms 21 Jun 2023 672nd Yewzir 🇧🇪 769 68 123ms 14 Feb 2024 673rd ovs-code 🇩🇪 768 69 5ms 10 Feb 2024 674th SirFireball3521 767 37 202ms 13 Mar 2023 675th fourth-bit 764 65 19ms 11 Jul 2023 675th Bmrl7 764 65 18ms 24 Feb 2024 675th shelerr 764 65 26ms 22 Aug 2025 678th Irratix 🇳🇱 763 96 57ms 11 Dec 2022 679th AlephSquirrel 762 58 116ms 1 Jun 2023 680th JGDoerrer 761 90 125ms 20 Dec 2022 680th klixel 🇨🇦 761 90 124ms 17 Apr 2023 680th TylerBloom 761 90 118ms 22 Mar 2024 680th Aurel300 🇨🇭 761 90 119ms 8 Jun 2024 684th steffan-polygolf 759 60 377ms 7 Mar 2024 685th ovs-code 🇩🇪 759 70 23ms 14 Dec 2024 686th lynn 759 102 31ms 18 Jul 2023 686th m-tkach 🇺🇦 759 102 31ms 7 Dec 2023 688th DialFrost 🇸🇬 758 69 113ms 5 days ago 689th janbehrens 🇩🇪 757 52 46ms 27 Nov 2022 690th SirBogman 🇺🇸 756 41 297ms 9 Jan 2024 690th dcgjb 756 41 1,753ms 31 Jan 2024 690th IISResetMe 756 41 313ms 10 Apr 2024 690th juliansiebert 🇩🇪 756 41 294ms 2 Feb 2025 694th DialFrost 🇸🇬 755 71 48ms 7 Dec 2024 695th Alex-x90 🇺🇸 755 97 61ms 20 Nov 2022 696th MeWhenI 🇻🇦 753 66 41ms 14 May 2023 697th aksyristos 752 66 19ms 17 Jan 2023 697th OllieBoyne 🇬🇧 752 66 19ms 28 Feb 2023 697th randolchance 752 66 19ms 12 Mar 2023 697th CheeseCake628 🇳🇴 752 66 18ms 19 Mar 2023 697th adamnielson42 🇺🇸 752 66 17ms 31 Mar 2023 697th ehulinsky 🇺🇸 752 66 18ms 8 May 2023 697th TheoKeller1 752 66 17ms 11 Jun 2023 697th dranjohn 752 66 16ms 11 Sep 2023 697th inverseLorentz 🇦🇺 752 66 19ms 23 Oct 2023 697th RedzGoose 🇦🇺 752 66 19ms 23 Oct 2024 697th JunkIce 752 66 21ms 24 Nov 2024 697th yokasuretsu 752 66 17ms 7 Jan 2025 697th croc54 752 66 17ms 13 Jan 2025 697th ejini6969 752 66 17ms 14 Jun 2025 697th osNiko 🇧🇷 752 66 17ms 20 Aug 2025 697th Troon 752 66 24ms 22 Aug 2025 713th Steffan153 🇫🇮 752 78 35ms 14 Jul 2023 713th GrayJoKing 🇦🇺 752 78 41ms 13 Aug 2023 713th kg583 🇺🇸 752 78 31ms 2 Oct 2025 716th Yewzir 🇧🇪 751 90 435ms 12 Feb 2024 717th dokutan 750 32 3ms 14 Nov 2024 718th retrohun 750 64 4,085ms 5 Nov 2023 719th Shanethegamer 🇺🇸 750 81 1,252ms 30 Nov 2022 720th inventshah 749 59 11ms 20 Nov 2022 First Prev 641–720 of 1,803 Next Last