The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
Fibonacci 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 155th lilyyy411 735 34 34ms 10 Sep 2021 155th bac0id 735 34 39ms 18 Oct 2021 155th AIn0n 735 34 36ms 1 Dec 2021 155th MichaelMBradley 🇨🇦 735 34 38ms 21 Mar 2022 155th oceko 735 34 37ms 26 Nov 2022 155th nstearns96 🇬🇧 735 34 36ms 15 Dec 2022 155th CheeseCake628 🇳🇴 735 34 37ms 15 Feb 2023 155th epic-programmer-guy 735 34 36ms 15 Dec 2023 155th stellartux 735 34 37ms 24 Dec 2023 155th hellopatrick 735 34 36ms 26 Dec 2023 155th Lv0Sys 🇵🇱 735 34 34ms 31 May 2025 155th albanian-laundromat 735 34 36ms 2 Oct 2025 155th Andrey2001 735 34 37ms 25 Nov 2025 155th TheZwierzLF 🇵🇱 735 34 37ms 4 days ago 175th JKHiggins 714 35 42ms 27 Jun 2019 175th jetpks 714 35 36ms 27 Jun 2019 175th idoschor 714 35 38ms 30 Nov 2020 175th bbakersmith 714 35 44ms 30 Jul 2021 175th FnControlOption 714 35 37ms 21 Aug 2022 175th cefqrn 714 35 38ms 26 May 2024 175th madeforlosers 714 35 39ms 22 Nov 2024 182nd Mir0ff944 694 36 38ms 24 Oct 2019 183rd iamsolarpowered 676 37 38ms 15 Dec 2017 183rd Boostik 676 37 37ms 7 Jan 2018 183rd robymus 676 37 36ms 17 Sep 2018 183rd boxjelly 676 37 34ms 9 Feb 2021 183rd 5quiwyrm 676 37 39ms 31 Aug 2022 183rd truisseaux 676 37 40ms 4 Sep 2024 183rd edsrzf 🇳🇿 676 37 37ms 13 Sep 2024 190th Pyroan 658 38 35ms 7 days ago 191st stevehodges 641 39 39ms 8 Nov 2017 191st JeremyC-za 641 39 37ms 9 Nov 2017 191st angetheo 641 39 42ms 19 Jan 2018 191st sacthedev 641 39 36ms 3 Apr 2018 191st okkun-oreo 641 39 38ms 2 Nov 2020 191st TheRealOhead 🇺🇸 641 39 34ms 24 Nov 2022 191st madex 🇩🇪 641 39 49ms 20 Jul 2024 191st Maximizer02 641 39 35ms 17 Sep 2025 199th yokasuretsu 625 40 35ms 16 Apr 2018 199th atsushiootani 625 40 38ms 7 Aug 2018 199th esmg1 625 40 34ms 22 Aug 2018 199th MichalMarsalek 🇨🇿 625 40 36ms 2 Sep 2022 199th Heathcorp 🇦🇺 625 40 37ms 26 Nov 2022 199th nortonbatista 625 40 38ms 31 Oct 2023 205th JRaspass 🇬🇧 610 41 38ms 23 Mar 2021 205th MCausc78 🇺🇦 610 41 37ms 29 Dec 2022 205th lgrandco 610 41 36ms 9 Oct 2024 208th tadd 595 42 35ms 16 Apr 2020 208th Ralac07 🇦🇺 595 42 36ms 17 Jun 2024 208th Just4FunCoder 595 42 37ms 26 Aug 2024 211th evanSpendlove 581 43 35ms 10 Dec 2020 212th biji1 568 44 39ms 26 Apr 2018 212th martica 568 44 38ms 20 May 2018 212th msbranicky 568 44 38ms 7 Sep 2023 215th greghull 556 45 38ms 8 Nov 2017 215th Noxilex 556 45 36ms 20 Mar 2019 215th ashtraypettingzoo 🇺🇸 556 45 37ms 16 Feb 2023 215th hacker112 🇸🇪 556 45 36ms 1 Jul 2024 219th adoxography 543 46 207ms 20 Sep 2018 219th CaAlden 543 46 37ms 10 May 2019 221st snltd 532 47 37ms 18 Aug 2019 221st michaelbaudino 532 47 212ms 18 Oct 2020 221st JesseNoEyes 🇺🇸 532 47 36ms 26 Sep 2024 221st Mikey-Beep 🇬🇧 532 47 33ms 20 Aug 2025 225th timcustard 521 48 33ms 10 Nov 2017 225th sech1p 🇵🇱 521 48 37ms 30 Dec 2020 225th martinnorling 🇸🇪 521 48 38ms 6 Feb 2022 225th purp 521 48 37ms 13 Aug 2022 225th eiburns 521 48 37ms 7 Sep 2023 225th SwordF-Official 521 48 37ms 2 Jun 2025 231st illegalnumbers 510 49 36ms 27 Jun 2019 231st b-paul 510 49 34ms 25 Dec 2020 233rd babcockd 500 50 37ms 19 Dec 2017 234th lbrito1 490 51 203ms 8 Jan 2022 234th azure-blondon 490 51 38ms 10 Jul 2024 236th zstearman3 481 52 33ms 11 Jul 2018 236th gpolumbo-broad 481 52 36ms 14 Mar 2019 236th karinknutsson 481 52 40ms 19 Mar 2021 236th HallMatthew314 481 52 151ms 5 Dec 2021 236th jonathanelliott 481 52 151ms 30 May 2024 First Prev 161–240 of 274 Next Last