The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in all languages in bytes. 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 Bytes Time Submitted 544th codingisgreatbutiamnot 816 62 16ms 6 Aug 2024 544th tjwrenn 816 62 17ms 6 Dec 2024 563rd MarcMush 🇫🇷 815 51 514ms 11 Jan 2024 564th ian-h-chamberlain 🇺🇸 815 84 141ms 47 hours ago 565th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 566th rucin93 🇵🇱 813 56 140ms 30 Aug 2024 566th sean-niemann 🇺🇸 813 56 139ms 16 May 2025 568th Steffan153 🇫🇮 813 75 126ms 14 Jan 2023 569th Steffan153 🇫🇮 812 66 48ms 16 Jan 2023 569th CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 571st Yewzir 🇧🇪 812 79 335ms 13 Feb 2024 572nd MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 573rd Yewzir 🇧🇪 811 86 457ms 2 Oct 2025 574th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 575th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 576th rhdqor213 804 67 5ms 6 Oct 2023 576th KasperKivimaeki 🇫🇮 804 67 5ms 31 Mar 2025 578th MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 579th emplv 🇱🇻 803 55 13ms 21 Nov 2022 579th dmrichwa 🇺🇸 803 55 12ms 14 Jan 2023 579th rucin93 🇵🇱 803 55 12ms 2 Aug 2024 579th vlpx 🇫🇮 803 55 15ms 23 Sep 2024 579th sean-niemann 🇺🇸 803 55 12ms 18 Jan 2025 584th GolfingSuccess 🇬🇷 803 59 344ms 15 Jan 2024 584th albanian-laundromat 803 59 335ms 8 Oct 2025 586th trist224 🇫🇷 803 63 16ms 14 Dec 2022 586th retrohun 803 63 19ms 28 Dec 2022 586th msbranicky 803 63 22ms 23 Jul 2023 586th PeterTillema 🇳🇱 803 63 17ms 18 Mar 2024 586th hellwue 803 63 302ms 25 Jun 2024 586th InigoK 🇺🇸 803 63 24ms 19 Sep 2025 592nd pardouin 🇫🇷 802 76 139ms 23 Apr 2025 593rd emgordon154 802 87 409ms 25 Sep 2025 594th Steffan153 🇫🇮 802 111 280ms 20 Nov 2022 595th pardouin 🇫🇷 801 68 33ms 24 Apr 2025 596th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 596th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 598th primo-ppcg 🇹🇭 800 67 56ms 20 Nov 2022 599th Yewzir 🇧🇪 799 52 387ms 26 Feb 2024 599th antimon2 🇯🇵 799 52 436ms 5 May 2024 601st Steffan153 🇫🇮 799 76 1,295ms 14 Jan 2023 602nd primo-ppcg 🇹🇭 798 40 282ms 20 Nov 2022 602nd Steffan153 🇫🇮 798 40 608ms 23 Nov 2022 602nd Natanaelel 🇸🇪 798 40 273ms 5 Jan 2024 605th Shanethegamer 🇺🇸 796 158 410ms 29 May 2025 606th emgordon154 795 56 56ms 6 Jun 2025 607th stefangimmillaro 795 59 27ms 20 Nov 2022 607th DialFrost 🇸🇬 795 59 26ms 12 Feb 2023 609th inventshah 795 69 13ms 20 Nov 2022 610th emplv 🇱🇻 795 112 274ms 21 Nov 2022 610th sean-niemann 🇺🇸 795 112 276ms 21 Jun 2023 612th GrayJoKing 🇦🇺 793 67 34ms 26 Oct 2023 612th DialFrost 🇸🇬 793 67 34ms 21 Dec 2023 614th janbehrens 🇩🇪 792 52 46ms 27 Nov 2022 615th snoozingnewt 🇨🇦 792 65 4,098ms 27 Sep 2025 616th msbranicky 792 72 147ms 1 Sep 2023 616th snoozingnewt 🇨🇦 792 72 259ms 9 Oct 2025 618th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 619th QuincyNash 🇺🇸 791 64 17ms 20 Nov 2022 619th nstearns96 🇬🇧 791 64 245ms 23 Nov 2022 619th Bodo171 791 64 16ms 27 Nov 2022 619th TaserTheFox 🇺🇸 791 64 16ms 14 Jan 2023 619th jmerle 🇳🇱 791 64 16ms 16 Feb 2023 619th vishwathg 791 64 16ms 7 Apr 2023 619th dteague3989 791 64 16ms 8 Aug 2023 619th NickTheEASDude 🇺🇸 791 64 23ms 1 May 2024 619th aalec 791 64 16ms 3 May 2024 619th mishak-sys 791 64 16ms 25 Feb 2025 619th YAJUE114514 791 64 15ms 1 Aug 2025 619th Deedogg 791 64 16ms 30 Oct 2025 631st Yewzir 🇧🇪 791 144 2,317ms 14 Nov 2025 632nd primo-ppcg 🇹🇭 790 60 3ms 20 Nov 2022 633rd MeWhenI 🇻🇦 790 177 39ms 29 Nov 2023 634th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 635th KatieLG 🇬🇧 789 60 352ms 16 Jan 2024 635th steffan-polygolf 789 60 377ms 7 Mar 2024 635th neel11235813 789 60 356ms 27 Mar 2024 638th pardouin 🇫🇷 788 68 57ms 25 Apr 2025 638th edsrzf 🇳🇿 788 68 47ms 9 days ago 640th stefangimmillaro 788 113 268ms 22 Jun 2023 First Prev 561–640 of 1,815 Next Last