The Calendar hole will go live in approximately 5 days. Why not try and solve it ahead of time?
Odious Numbers 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 primo-ppcg 🇹🇭 1,000 26 37ms 3 Jan 2020 1st sisyphus-ppcg 🇦🇺 1,000 26 38ms 10 Feb 2021 1st JayXon 🇺🇸 1,000 26 40ms 20 Feb 2021 1st Lydxn 🇨🇦 1,000 26 41ms 17 Aug 2021 1st nwellnhof 🇩🇪 1,000 26 46ms 30 Dec 2021 1st stefangimmillaro 1,000 26 38ms 3 Aug 2023 1st MeWhenI 🇻🇦 1,000 26 39ms 3 Aug 2023 1st radarek 🇵🇱 1,000 26 44ms 16 Dec 2024 1st pardouin 🇫🇷 1,000 26 42ms 11 Apr 2025 10th Steffan153 🇫🇮 929 28 37ms 25 Apr 2023 10th sean-niemann 🇺🇸 929 28 37ms 12 Jun 2025 12th janlelis 897 29 37ms 5 Jan 2020 12th OhmNomNom 897 29 37ms 30 Oct 2022 12th Shanethegamer 🇺🇸 897 29 39ms 22 Mar 2023 12th xsot 🇸🇬 897 29 38ms 25 May 2023 12th Natanaelel 🇸🇪 897 29 38ms 14 Mar 2024 12th fuzzylojik-golf 🇺🇸 897 29 43ms 29 Aug 2025 18th JOrE20 🇺🇸 867 30 33ms 8 hours ago 19th prplz 🇦🇺 813 32 38ms 16 Mar 2020 19th GrayJoKing 🇦🇺 813 32 37ms 19 May 2021 19th FlyingPenguin223 813 32 44ms 1 Nov 2024 22nd jaredcrystal 🇺🇸 788 33 38ms 10 Dec 2018 22nd yzhs 🇩🇪 788 33 37ms 8 Sep 2020 22nd Waffle3z 788 33 36ms 11 Jan 2021 22nd 4hg 🇺🇸 788 33 37ms 19 Jul 2022 22nd m-tkach 🇺🇦 788 33 40ms 9 May 2023 22nd ovs-code 🇩🇪 788 33 38ms 9 May 2023 22nd emgordon154 788 33 36ms 25 Sep 2024 22nd CaedenHarper 🇨🇦 788 33 38ms 28 Aug 2025 30th j55d 765 34 39ms 5 Dec 2017 30th SirBogman 🇺🇸 765 34 36ms 14 Feb 2020 30th janbehrens 🇩🇪 765 34 40ms 24 Mar 2021 30th rbviz 765 34 39ms 29 Mar 2021 30th hugolgst 765 34 41ms 4 Jun 2021 30th anter69 🇭🇺 765 34 37ms 27 Jun 2021 30th UladzimirSukharukau 765 34 38ms 13 Sep 2021 30th olivermrose 🇺🇸 765 34 42ms 14 Sep 2021 30th akshatj27 🇦🇶 765 34 37ms 11 Jan 2022 30th orthoplex 🇨🇽 765 34 38ms 1 Apr 2022 30th Irratix 🇳🇱 765 34 44ms 27 Jun 2022 30th jared-hughes 765 34 42ms 9 Sep 2022 30th Andriamanitra 🇫🇮 765 34 37ms 23 Sep 2022 30th DialFrost 🇸🇬 765 34 42ms 29 Jan 2023 30th Yewzir 🇧🇪 765 34 43ms 17 Nov 2023 30th BREMAUCY 🇫🇷 765 34 39ms 13 Jun 2025 30th dokutan 765 34 36ms 17 Jul 2025 47th proton 🇩🇪 743 35 38ms 9 Jun 2020 47th hiddicop 🇸🇪 743 35 39ms 29 Jan 2021 47th liemvo 🇻🇳 743 35 37ms 16 Apr 2021 47th AbrahamJLR 🇻🇪 743 35 39ms 14 Jun 2025 47th beirigo 🇧🇷 743 35 46ms 20 Nov 2025 52nd vonagam 722 36 38ms 8 Nov 2017 52nd hrrs01 722 36 37ms 21 Sep 2018 52nd gilufin 722 36 44ms 30 May 2021 52nd daninnm 722 36 36ms 23 Jul 2021 52nd annaproxy 722 36 38ms 24 Aug 2022 57th jimworm 703 37 41ms 8 Nov 2017 57th sk- 703 37 42ms 12 Sep 2019 57th rniii 703 37 43ms 21 Aug 2023 57th aaronze 🇦🇺 703 37 35ms 17 Sep 2023 57th olleicua 🇺🇸 703 37 37ms 9 Jan 2024 62nd graft 684 38 38ms 10 Mar 2018 62nd acornellier 684 38 35ms 8 Dec 2018 62nd n1LS 684 38 37ms 9 Oct 2019 62nd Haksell 🇦🇶 684 38 41ms 5 Apr 2020 62nd nexaitch 684 38 41ms 7 Jul 2020 62nd SephQ 684 38 45ms 11 Feb 2021 62nd tatzyr 🇯🇵 684 38 41ms 8 Jan 2025 62nd ejini6969 684 38 39ms 13 Jun 2025 62nd blaztoma 🇱🇹 684 38 36ms 12 Oct 2025 71st AlephSquirrel 667 39 36ms 7 Mar 2023 71st snoozingnewt 🇨🇦 667 39 38ms 14 Sep 2025 73rd KatieLG 🇬🇧 650 40 38ms 10 Apr 2022 73rd aydamak 650 40 35ms 15 May 2024 75th robymus 634 41 40ms 17 Sep 2018 75th alexjurkiewicz 🇦🇺 634 41 35ms 8 Jul 2022 77th biinari 619 42 42ms 27 Mar 2018 77th ajc2 619 42 35ms 1 May 2018 77th jstanley0 619 42 41ms 12 Dec 2020 77th Babafaba 619 42 38ms 15 Oct 2025 1–80 of 136 Next Last