The Calendar hole will go live in approximately 5 days. Why not try and solve it ahead of time?
Odious Numbers in Ruby 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 1st sisyphus-ppcg 🇦🇺 1,000 28 37ms 4 Feb 2022 1st Lydxn 🇨🇦 1,000 28 41ms 4 Feb 2022 1st radarek 🇵🇱 1,000 28 37ms 25 Mar 2022 1st JayXon 🇺🇸 1,000 28 37ms 7 Sep 2022 5th janlelis 966 29 37ms 5 Jan 2020 5th primo-ppcg 🇹🇭 966 29 46ms 5 Oct 2020 5th nwellnhof 🇩🇪 966 29 38ms 1 Nov 2021 5th OhmNomNom 966 29 37ms 30 Oct 2022 5th Steffan153 🇫🇮 966 29 37ms 17 Feb 2023 5th Shanethegamer 🇺🇸 966 29 39ms 22 Mar 2023 5th xsot 🇸🇬 966 29 38ms 25 May 2023 5th stefangimmillaro 966 29 39ms 4 Aug 2023 5th MeWhenI 🇻🇦 966 29 37ms 4 Aug 2023 5th Natanaelel 🇸🇪 966 29 38ms 14 Mar 2024 5th sean-niemann 🇺🇸 966 29 33ms 27 Dec 2024 5th fuzzylojik-golf 🇺🇸 966 29 43ms 29 Aug 2025 5th pardouin 🇫🇷 966 29 36ms 2 Sep 2025 18th JOrE20 🇺🇸 933 30 33ms 84 mins ago 19th prplz 🇦🇺 875 32 38ms 16 Mar 2020 19th GrayJoKing 🇦🇺 875 32 37ms 19 May 2021 19th FlyingPenguin223 875 32 44ms 1 Nov 2024 22nd jaredcrystal 🇺🇸 848 33 38ms 10 Dec 2018 22nd yzhs 🇩🇪 848 33 37ms 8 Sep 2020 22nd Waffle3z 848 33 36ms 11 Jan 2021 22nd 4hg 🇺🇸 848 33 37ms 19 Jul 2022 22nd m-tkach 🇺🇦 848 33 40ms 9 May 2023 22nd ovs-code 🇩🇪 848 33 38ms 9 May 2023 22nd emgordon154 848 33 36ms 25 Sep 2024 22nd CaedenHarper 🇨🇦 848 33 38ms 28 Aug 2025 30th j55d 824 34 39ms 5 Dec 2017 30th SirBogman 🇺🇸 824 34 36ms 14 Feb 2020 30th janbehrens 🇩🇪 824 34 40ms 24 Mar 2021 30th rbviz 824 34 39ms 29 Mar 2021 30th hugolgst 824 34 41ms 4 Jun 2021 30th anter69 🇭🇺 824 34 37ms 27 Jun 2021 30th UladzimirSukharukau 824 34 38ms 13 Sep 2021 30th olivermrose 🇺🇸 824 34 42ms 14 Sep 2021 30th akshatj27 🇦🇶 824 34 37ms 11 Jan 2022 30th orthoplex 🇨🇽 824 34 38ms 1 Apr 2022 30th Irratix 🇳🇱 824 34 44ms 27 Jun 2022 30th jared-hughes 824 34 42ms 9 Sep 2022 30th Andriamanitra 🇫🇮 824 34 37ms 23 Sep 2022 30th DialFrost 🇸🇬 824 34 42ms 29 Jan 2023 30th Yewzir 🇧🇪 824 34 43ms 17 Nov 2023 30th BREMAUCY 🇫🇷 824 34 39ms 13 Jun 2025 30th dokutan 824 34 36ms 17 Jul 2025 47th proton 🇩🇪 800 35 38ms 9 Jun 2020 47th hiddicop 🇸🇪 800 35 39ms 29 Jan 2021 47th liemvo 🇻🇳 800 35 37ms 16 Apr 2021 47th AbrahamJLR 🇻🇪 800 35 39ms 14 Jun 2025 47th beirigo 🇧🇷 800 35 46ms 20 Nov 2025 52nd vonagam 778 36 38ms 8 Nov 2017 52nd hrrs01 778 36 37ms 21 Sep 2018 52nd gilufin 778 36 44ms 30 May 2021 52nd daninnm 778 36 36ms 23 Jul 2021 52nd annaproxy 778 36 38ms 24 Aug 2022 57th jimworm 757 37 41ms 8 Nov 2017 57th sk- 757 37 42ms 12 Sep 2019 57th rniii 757 37 43ms 21 Aug 2023 57th aaronze 🇦🇺 757 37 35ms 17 Sep 2023 57th olleicua 🇺🇸 757 37 37ms 9 Jan 2024 62nd graft 737 38 38ms 10 Mar 2018 62nd acornellier 737 38 35ms 8 Dec 2018 62nd n1LS 737 38 37ms 9 Oct 2019 62nd Haksell 🇦🇶 737 38 41ms 5 Apr 2020 62nd nexaitch 737 38 41ms 7 Jul 2020 62nd SephQ 737 38 45ms 11 Feb 2021 62nd tatzyr 🇯🇵 737 38 41ms 8 Jan 2025 62nd ejini6969 737 38 39ms 13 Jun 2025 62nd blaztoma 🇱🇹 737 38 36ms 12 Oct 2025 71st AlephSquirrel 718 39 36ms 7 Mar 2023 71st snoozingnewt 🇨🇦 718 39 38ms 14 Sep 2025 73rd KatieLG 🇬🇧 700 40 38ms 10 Apr 2022 73rd aydamak 700 40 35ms 15 May 2024 75th robymus 683 41 40ms 17 Sep 2018 75th alexjurkiewicz 🇦🇺 683 41 35ms 8 Jul 2022 77th biinari 667 42 42ms 27 Mar 2018 77th ajc2 667 42 35ms 1 May 2018 77th jstanley0 667 42 41ms 12 Dec 2020 77th Babafaba 667 42 38ms 15 Oct 2025 1–80 of 136 Next Last