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 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 549th neel11235813 816 62 17ms 27 Mar 2024 549th SB-945 816 62 18ms 31 Mar 2024 549th BREMAUCY 🇫🇷 816 62 17ms 14 May 2024 549th ahmetdemirag 🇨🇾 816 62 18ms 25 Jun 2024 549th cros107 🇦🇺 816 62 22ms 27 Jun 2024 549th codingisgreatbutiamnot 816 62 16ms 6 Aug 2024 549th tjwrenn 816 62 17ms 6 Dec 2024 568th MarcMush 🇫🇷 815 51 443ms 11 Jan 2024 569th ian-h-chamberlain 🇺🇸 815 84 127ms 7 days ago 570th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 571st rucin93 🇵🇱 813 56 140ms 30 Aug 2024 571st sean-niemann 🇺🇸 813 56 139ms 16 May 2025 573rd Steffan153 🇫🇮 813 75 126ms 14 Jan 2023 574th Steffan153 🇫🇮 812 66 48ms 16 Jan 2023 574th CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 576th Yewzir 🇧🇪 812 79 335ms 13 Feb 2024 577th MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 578th Yewzir 🇧🇪 811 86 457ms 2 Oct 2025 579th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 580th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 581st rhdqor213 804 67 5ms 6 Oct 2023 581st KasperKivimaeki 🇫🇮 804 67 5ms 31 Mar 2025 583rd MichalMarsalek 🇨🇿 804 71 155ms 16 Dec 2022 584th emplv 🇱🇻 803 55 13ms 21 Nov 2022 584th dmrichwa 🇺🇸 803 55 12ms 14 Jan 2023 584th rucin93 🇵🇱 803 55 12ms 2 Aug 2024 584th vlpx 🇫🇮 803 55 15ms 23 Sep 2024 584th sean-niemann 🇺🇸 803 55 12ms 18 Jan 2025 589th GolfingSuccess 🇬🇷 803 59 344ms 15 Jan 2024 589th albanian-laundromat 803 59 335ms 8 Oct 2025 591st trist224 🇫🇷 803 63 16ms 14 Dec 2022 591st retrohun 803 63 19ms 28 Dec 2022 591st msbranicky 803 63 22ms 23 Jul 2023 591st PeterTillema 🇳🇱 803 63 17ms 18 Mar 2024 591st hellwue 803 63 302ms 25 Jun 2024 591st InigoK 🇺🇸 803 63 24ms 19 Sep 2025 597th pardouin 🇫🇷 802 68 33ms 24 Apr 2025 598th pardouin 🇫🇷 802 76 139ms 23 Apr 2025 599th emgordon154 802 87 409ms 25 Sep 2025 600th Steffan153 🇫🇮 802 111 280ms 20 Nov 2022 601st ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 601st snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 603rd primo-ppcg 🇹🇭 800 67 56ms 20 Nov 2022 604th Yewzir 🇧🇪 799 52 288ms 26 Feb 2024 604th antimon2 🇯🇵 799 52 363ms 5 May 2024 606th Steffan153 🇫🇮 799 76 1,295ms 14 Jan 2023 607th primo-ppcg 🇹🇭 798 40 247ms 20 Nov 2022 607th Steffan153 🇫🇮 798 40 287ms 23 Nov 2022 607th Natanaelel 🇸🇪 798 40 227ms 5 Jan 2024 610th Shanethegamer 🇺🇸 796 158 410ms 29 May 2025 611th emgordon154 795 56 56ms 6 Jun 2025 612th stefangimmillaro 795 59 32ms 20 Nov 2022 613th inventshah 795 69 13ms 20 Nov 2022 614th emplv 🇱🇻 795 112 274ms 21 Nov 2022 614th sean-niemann 🇺🇸 795 112 276ms 21 Jun 2023 616th GrayJoKing 🇦🇺 793 67 34ms 26 Oct 2023 616th DialFrost 🇸🇬 793 67 34ms 21 Dec 2023 618th janbehrens 🇩🇪 792 52 46ms 27 Nov 2022 618th error256 792 52 46ms 94 mins ago 620th snoozingnewt 🇨🇦 792 65 3,450ms 27 Sep 2025 621st msbranicky 792 72 147ms 1 Sep 2023 621st snoozingnewt 🇨🇦 792 72 259ms 9 Oct 2025 623rd Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 624th primo-ppcg 🇹🇭 791 60 3ms 20 Nov 2022 625th QuincyNash 🇺🇸 791 64 17ms 20 Nov 2022 625th nstearns96 🇬🇧 791 64 245ms 23 Nov 2022 625th Bodo171 791 64 16ms 27 Nov 2022 625th TaserTheFox 🇺🇸 791 64 16ms 14 Jan 2023 625th jmerle 🇳🇱 791 64 16ms 16 Feb 2023 625th vishwathg 791 64 16ms 7 Apr 2023 625th dteague3989 791 64 16ms 8 Aug 2023 625th NickTheEASDude 🇺🇸 791 64 23ms 1 May 2024 625th aalec 791 64 16ms 3 May 2024 625th mishak-sys 791 64 16ms 25 Feb 2025 625th YAJUE114514 791 64 15ms 1 Aug 2025 625th Deedogg 791 64 16ms 30 Oct 2025 637th Yewzir 🇧🇪 791 144 2,317ms 14 Nov 2025 638th MeWhenI 🇻🇦 790 177 39ms 29 Nov 2023 639th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 640th KatieLG 🇬🇧 789 60 352ms 16 Jan 2024 First Prev 561–640 of 1,818 Next Last