The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Fibonacci in C# 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 237th azure-blondon 689 74 355ms 5 May 2024 242nd mort607e 680 75 338ms 21 Nov 2021 242nd lesserfish 680 75 362ms 21 Nov 2021 244th mykroft42 671 76 381ms 21 Nov 2021 245th daviddostal 654 78 381ms 21 Nov 2021 245th joll05 🇸🇪 654 78 362ms 21 Nov 2021 245th hacktick 654 78 387ms 22 Mar 2022 245th malworthy 654 78 365ms 13 Oct 2023 245th brimstonetrader 654 78 375ms 5 Jan 2024 250th hklemp 🇩🇪 646 79 371ms 21 Nov 2021 250th MarkStockwellZA 646 79 366ms 4 Jan 2022 250th ElysiaVesper 646 79 375ms 19 Nov 2023 250th JesseNoEyes 🇺🇸 646 79 387ms 25 Sep 2024 250th qrakhen 646 79 377ms 5 Nov 2025 255th neptuwunium 630 81 371ms 16 Dec 2021 255th brianonymous 630 81 367ms 30 Jul 2022 255th KiwiLT 630 81 377ms 14 Nov 2022 258th lilyyy411 622 82 354ms 21 Nov 2021 259th ClFeSc 607 84 381ms 3 Aug 2022 260th Lizard314 600 85 361ms 21 Nov 2021 261st mduckles 593 86 348ms 18 Nov 2022 262nd c0d3-4-F00d 🇩🇪 586 87 361ms 21 Nov 2021 262nd Rambso 586 87 346ms 28 Mar 2025 264th dillon-duncando 580 88 368ms 21 Dec 2021 265th mihaits 573 89 381ms 21 Nov 2021 265th apocriva 573 89 372ms 24 Nov 2023 267th JacobStanleyJones 567 90 396ms 21 Mar 2022 268th bschorno 560 91 361ms 29 Jul 2022 269th BradSissons 🇳🇿 554 92 363ms 21 Nov 2021 269th Xeoneid 554 92 370ms 21 Nov 2021 269th zaekyo 554 92 364ms 5 Jul 2022 269th Smetalo 554 92 375ms 24 Aug 2022 273rd oschmidh 548 93 374ms 21 Nov 2021 273rd sech1p 🇵🇱 548 93 363ms 21 Nov 2021 273rd rifatx 548 93 373ms 24 Jul 2024 276th aske0778 543 94 349ms 21 Nov 2021 276th RockOfStone 543 94 365ms 23 Mar 2024 276th BeansMage42 543 94 381ms 29 Dec 2024 279th ze-h 🇺🇸 531 96 357ms 12 Jan 2022 279th cingulataluke 531 96 374ms 2 Jun 2024 281st pikti 515 99 383ms 21 Nov 2021 281st artisiole 🇺🇸 515 99 352ms 24 Mar 2024 281st johannes-looney-lizard 515 99 374ms 29 Apr 2025 284th mhayesm 510 100 337ms 21 Nov 2021 284th Robbe7730 510 100 359ms 21 Nov 2021 286th Jennifervl 🇸🇪 505 101 358ms 10 Dec 2021 286th uncertaain 505 101 345ms 28 Dec 2023 288th tbschff 500 102 348ms 15 Apr 2022 289th richard-oelze 🇩🇪 490 104 383ms 24 Jan 2021 290th tik25 486 105 357ms 28 Mar 2024 291st wescombs10 481 106 359ms 30 Oct 2022 291st lbussell 481 106 388ms 16 Dec 2022 293rd NovemberOrWhatever 477 107 384ms 6 Nov 2022 293rd bilal2709 477 107 368ms 13 Aug 2025 295th Mortistar 472 108 358ms 18 Jul 2023 296th iPablol 468 109 363ms 25 Oct 2023 297th johnlowerytn 447 114 354ms 30 Dec 2024 298th sm1lko 440 116 367ms 12 Oct 2022 299th sd-tang 🇦🇺 436 117 360ms 12 Dec 2021 299th gpikmddk 436 117 377ms 17 Oct 2022 301st Noah-Fox 432 118 366ms 1 Jun 2022 302nd arctouch-kseniyagaripova 429 119 402ms 9 Nov 2022 303rd DaCuteRaccoon 421 121 369ms 28 Apr 2022 304th Anthony-Williams-06 411 124 358ms 30 Nov 2022 304th od86 411 124 372ms 12 Nov 2025 306th abailey2020 🇺🇸 408 125 375ms 21 Nov 2021 307th AwexoTeam 398 128 368ms 17 Jul 2025 308th Endoxos0 381 134 364ms 2 Sep 2022 309th RobertEves92 🇬🇧 372 137 390ms 8 Aug 2023 310th BarisYildiz 367 139 388ms 21 Nov 2021 311th Philipuss1 362 141 373ms 21 Nov 2021 312th arthvr9 359 142 405ms 23 Oct 2024 313th sandbxk 347 147 381ms 24 Aug 2022 314th jsermini2 333 153 359ms 21 Nov 2021 315th hdformat 331 154 360ms 21 Nov 2021 316th brandon-04 307 166 373ms 12 Nov 2025 317th Bananapants22 293 174 396ms 21 Aug 2022 318th mokymok 🇺🇸 282 181 330ms 21 Nov 2021 318th retrohun 282 181 356ms 27 Dec 2022 318th Mabeloid 🇳🇴 282 181 348ms 18 Sep 2024 First Prev 241–320 of 324 Next Last