The Calendar hole will go live in approximately 13 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 241st mort607e 680 75 338ms 21 Nov 2021 241st lesserfish 680 75 362ms 21 Nov 2021 243rd mykroft42 671 76 381ms 21 Nov 2021 244th daviddostal 654 78 381ms 21 Nov 2021 244th joll05 🇸🇪 654 78 362ms 21 Nov 2021 244th hacktick 654 78 387ms 22 Mar 2022 244th malworthy 654 78 365ms 13 Oct 2023 244th brimstonetrader 654 78 375ms 5 Jan 2024 249th hklemp 🇩🇪 646 79 371ms 21 Nov 2021 249th MarkStockwellZA 646 79 366ms 4 Jan 2022 249th ElysiaVesper 646 79 375ms 19 Nov 2023 249th JesseNoEyes 🇺🇸 646 79 387ms 25 Sep 2024 249th qrakhen 646 79 377ms 5 Nov 2025 254th neptuwunium 630 81 371ms 16 Dec 2021 254th brianonymous 630 81 367ms 30 Jul 2022 254th KiwiLT 630 81 377ms 14 Nov 2022 257th lilyyy411 622 82 354ms 21 Nov 2021 258th ClFeSc 607 84 381ms 3 Aug 2022 259th Lizard314 600 85 361ms 21 Nov 2021 260th mduckles 593 86 348ms 18 Nov 2022 261st c0d3-4-F00d 🇩🇪 586 87 361ms 21 Nov 2021 261st Rambso 586 87 346ms 28 Mar 2025 263rd dillon-duncando 580 88 368ms 21 Dec 2021 264th mihaits 573 89 381ms 21 Nov 2021 264th apocriva 573 89 372ms 24 Nov 2023 266th JacobStanleyJones 567 90 396ms 21 Mar 2022 267th bschorno 560 91 361ms 29 Jul 2022 268th BradSissons 🇳🇿 554 92 363ms 21 Nov 2021 268th Xeoneid 554 92 370ms 21 Nov 2021 268th zaekyo 554 92 364ms 5 Jul 2022 268th Smetalo 554 92 375ms 24 Aug 2022 272nd oschmidh 548 93 374ms 21 Nov 2021 272nd sech1p 🇵🇱 548 93 363ms 21 Nov 2021 272nd rifatx 548 93 373ms 24 Jul 2024 275th aske0778 543 94 349ms 21 Nov 2021 275th RockOfStone 543 94 365ms 23 Mar 2024 275th BeansMage42 543 94 381ms 29 Dec 2024 278th ze-h 🇺🇸 531 96 357ms 12 Jan 2022 278th cingulataluke 531 96 374ms 2 Jun 2024 280th pikti 515 99 383ms 21 Nov 2021 280th artisiole 🇺🇸 515 99 352ms 24 Mar 2024 280th johannes-looney-lizard 515 99 374ms 29 Apr 2025 283rd mhayesm 510 100 337ms 21 Nov 2021 283rd Robbe7730 510 100 359ms 21 Nov 2021 285th Jennifervl 🇸🇪 505 101 358ms 10 Dec 2021 285th uncertaain 505 101 345ms 28 Dec 2023 287th tbschff 500 102 348ms 15 Apr 2022 288th richard-oelze 🇩🇪 490 104 383ms 24 Jan 2021 289th tik25 486 105 357ms 28 Mar 2024 290th wescombs10 481 106 359ms 30 Oct 2022 290th lbussell 481 106 388ms 16 Dec 2022 292nd NovemberOrWhatever 477 107 384ms 6 Nov 2022 292nd bilal2709 477 107 368ms 13 Aug 2025 294th Mortistar 472 108 358ms 18 Jul 2023 295th iPablol 468 109 363ms 25 Oct 2023 296th johnlowerytn 447 114 354ms 30 Dec 2024 297th sm1lko 440 116 367ms 12 Oct 2022 298th sd-tang 🇦🇺 436 117 360ms 12 Dec 2021 298th gpikmddk 436 117 377ms 17 Oct 2022 300th Noah-Fox 432 118 366ms 1 Jun 2022 301st arctouch-kseniyagaripova 429 119 402ms 9 Nov 2022 302nd DaCuteRaccoon 421 121 369ms 28 Apr 2022 303rd Anthony-Williams-06 411 124 358ms 30 Nov 2022 303rd od86 411 124 372ms 12 Nov 2025 305th abailey2020 🇺🇸 408 125 375ms 21 Nov 2021 306th AwexoTeam 398 128 368ms 17 Jul 2025 307th Endoxos0 381 134 364ms 2 Sep 2022 308th RobertEves92 🇬🇧 372 137 390ms 8 Aug 2023 309th BarisYildiz 367 139 388ms 21 Nov 2021 310th Philipuss1 362 141 373ms 21 Nov 2021 311th arthvr9 359 142 405ms 23 Oct 2024 312th sandbxk 347 147 381ms 24 Aug 2022 313th jsermini2 333 153 359ms 21 Nov 2021 314th hdformat 331 154 360ms 21 Nov 2021 315th brandon-04 307 166 373ms 12 Nov 2025 316th Bananapants22 293 174 396ms 21 Aug 2022 317th mokymok 🇺🇸 282 181 330ms 21 Nov 2021 317th retrohun 282 181 356ms 27 Dec 2022 317th Mabeloid 🇳🇴 282 181 348ms 18 Sep 2024 320th KatieLG-Transpiler 🇬🇧 276 185 347ms 23 Jun 2022 First Prev 241–320 of 323 Next Last