The Calendar hole will go live in approximately 3 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in Ruby 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 1st Lydxn 🇨🇦 1,000 41 58ms 14 Jan 2023 2nd GrayJoKing 🇦🇺 953 43 186ms 20 Nov 2022 2nd stefangimmillaro 953 43 175ms 5 Jan 2023 2nd radarek 🇵🇱 953 43 191ms 22 Jul 2024 2nd pardouin 🇫🇷 953 43 172ms 22 Apr 2025 2nd error256 953 43 49ms 3 days ago 7th JayXon 🇺🇸 932 44 56ms 20 Nov 2022 7th sisyphus-ppcg 🇦🇺 932 44 175ms 21 Nov 2022 7th Steffan153 🇫🇮 932 44 55ms 22 Nov 2022 7th m-tkach 🇺🇦 932 44 58ms 22 Nov 2022 7th ovs-code 🇩🇪 932 44 50ms 22 Nov 2022 7th nwellnhof 🇩🇪 932 44 49ms 26 Nov 2022 7th janlelis 932 44 44ms 29 Nov 2022 7th xsot 🇸🇬 932 44 59ms 11 Jun 2023 7th Natanaelel 🇸🇪 932 44 48ms 12 Jul 2023 7th MeWhenI 🇻🇦 932 44 161ms 7 Aug 2023 7th DialFrost 🇸🇬 932 44 53ms 31 May 2024 7th sean-niemann 🇺🇸 932 44 49ms 4 Aug 2025 7th fuzzylojik-golf 🇺🇸 932 44 50ms 20 Aug 2025 20th Andriamanitra 🇫🇮 911 45 55ms 17 Jul 2023 21st primo-ppcg 🇹🇭 891 46 51ms 20 Nov 2022 21st Shanethegamer 🇺🇸 891 46 52ms 21 Nov 2022 23rd anter69 🇭🇺 872 47 55ms 24 Jan 2023 23rd emgordon154 872 47 55ms 19 Mar 2025 23rd Lv0Sys 🇵🇱 872 47 50ms 20 days ago 26th snoozingnewt 🇨🇦 854 48 50ms 23 Oct 2025 27th dokutan 837 49 56ms 30 Apr 2024 28th AlephSquirrel 820 50 44ms 7 Mar 2023 28th SirBogman 🇺🇸 820 50 54ms 10 Jan 2024 30th janbehrens 🇩🇪 788 52 53ms 27 Nov 2022 31st tatzyr 🇯🇵 719 57 52ms 26 Mar 2025 32nd 4hg 🇺🇸 707 58 55ms 11 Dec 2022 32nd csharpython 707 58 50ms 5 Aug 2025 34th ejini6969 695 59 59ms 14 Jun 2025 35th Yewzir 🇧🇪 672 61 56ms 14 Feb 2024 35th lacrosse 672 61 57ms 28 Nov 2025 37th KatieLG 🇬🇧 661 62 48ms 2 Oct 2025 38th BREMAUCY 🇫🇷 651 63 44ms 15 Apr 2024 38th TheZwierzLF 🇵🇱 651 63 59ms 6 days ago 40th aksyristos 641 64 55ms 2 Feb 2023 41st olleicua 🇺🇸 631 65 57ms 3 Feb 2024 42nd aaronze 🇦🇺 612 67 57ms 17 Sep 2023 43rd Pluviolithic 562 73 60ms 18 Oct 2023 44th beergit 519 79 83ms 7 Aug 2024 44th Ohh-n 519 79 40ms 8 Sep 2025 46th msbranicky 500 82 45ms 5 Sep 2023 47th artem-aramma 494 83 59ms 18 Jun 2025 48th yobatm 482 85 51ms 3 Aug 2025 49th HumanoidCPU 456 90 49ms 6 Jun 2024 50th Ralac07 🇦🇺 353 116 59ms 17 Jun 2024 51st retrohun 2 20,667 43ms 28 Dec 2022 51st Haksell 🇦🇶 2 20,667 43ms 23 Feb 2023 51st Mabeloid 🇳🇴 2 20,667 42ms 3 Oct 2024 51st CaedenHarper 🇨🇦 2 20,667 44ms 16 Aug 2025 55th KatieLG-Transpiler 🇬🇧 2 20,677 48ms 21 Nov 2022 1–55 of 55