The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
All holes in Fortran 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 Holes Points Bytes Submitted 81st dceresoli 1 778 63 20 Apr 2020 82nd Lv0Sys 🇵🇱 1 726 197 10 days ago 83rd mokymok 🇺🇸 2 714 357 1 Nov 2021 84th trist224 🇫🇷 1 698 63 28 Nov 2022 84th oceko 1 698 63 28 Nov 2022 84th andrewjc2000 1 698 63 14 Jul 2025 87th FortuiteMan 🇫🇷 2 692 1,428 29 Sep 2024 88th ashtraypettingzoo 🇺🇸 1 688 64 21 Mar 2024 89th billings7 🇬🇧 1 688 208 19 May 2024 90th andersk 🇺🇸 1 678 90 11 May 2020 91st ytaki0801 🇯🇵 1 677 65 19 Jun 2021 91st mathisfun271 1 677 65 22 Feb 2024 93rd JunkIce 2 674 1,447 27 Feb 2025 94th aksyristos 3 648 1,872 20 days ago 95th melven 1 647 215 16 Oct 2025 96th orthoplex 🇨🇽 1 638 69 22 Jan 2022 96th CedricGebistorf 1 638 69 4 Feb 2022 96th martinnorling 🇸🇪 1 638 69 8 Feb 2022 96th CheeseCake628 🇳🇴 1 638 69 11 Mar 2023 96th Maximizer02 1 638 69 1 Oct 2023 96th charliegaming 1 638 69 3 Oct 2023 96th jtaxen 1 638 69 30 Mar 2024 103rd AidanWalter 4 631 3,825 26 days ago 104th Babafaba 1 629 62 11 Oct 2025 105th cthierfelder 🇲🇨 1 622 90 3 Sep 2025 106th emgordon154 1 620 71 26 Jul 2024 107th guilhem-roy 🇫🇷 1 611 234 28 Jun 2023 108th rucin93 🇵🇱 2 607 1,503 1 May 2024 109th arctouch-cristiannevianna 1 602 103 9 Nov 2023 110th epic-programmer-guy 1 571 77 1 Jan 2024 111th annaproxy 1 563 80 14 Feb 2022 112th LHLaurini 🇧🇷 1 547 722 14 Jul 2024 112th prestosilver 🇺🇸 1 547 722 20 days ago 114th KAKISKA-code 🇫🇮 1 536 125 24 May 2025 115th samuel-thesing 🇩🇪 1 532 124 19 Feb 2025 116th heanyang1 1 531 1,019 29 May 2025 117th thisishowmymindworks 🇳🇴 1 529 85 6 Aug 2020 117th Sora1248 🇩🇪 1 529 85 23 Feb 2023 119th sech1p 🇵🇱 1 512 86 30 Oct 2021 120th malworthy 1 502 285 10 Oct 2025 121st hyvyys 1 500 98 28 Sep 2020 122nd lukehewittvandy 1 493 134 11 May 2021 122nd fisherthomas14 1 493 134 11 May 2021 124th BBoehm 🇩🇪 1 468 94 23 Dec 2020 125th jiaminglimjm 🇲🇾 1 465 159 9 Jan 2021 126th korobkin 1 462 143 4 Jan 2021 127th sanssaraf 1 455 99 25 Apr 2020 128th MaxElf999 1 450 109 13 Dec 2022 129th Garklein 🇨🇦 1 444 99 6 Jan 2022 130th bbakersmith 1 437 151 13 Jul 2021 131st Zach1031 1 431 102 21 Nov 2025 132nd sm1lko 1 423 104 14 Dec 2022 133rd ndren 2 420 1,191 28 Aug 2023 134th bwearley 1 405 163 17 Apr 2020 135th Schmitt-Very-Cool 2 405 692 17 days ago 136th sunberry00 1 391 169 18 Feb 2025 137th RYNO8 1 388 170 5 Aug 2021 138th AgentIvan 🇺🇦 1 384 172 25 Mar 2021 138th inventshah 1 384 172 17 Jun 2022 140th Andriamanitra 🇫🇮 1 382 173 23 Sep 2022 140th namelessiw 1 382 173 16 Jan 2024 142nd Smetalo 1 372 121 25 Aug 2022 143rd alphafalfa 1 369 179 26 Aug 2024 144th GWStuart 2 362 1,545 25 May 2024 145th aliakseikalosha 1 357 185 10 Oct 2024 146th DaCuteRaccoon 1 353 187 3 May 2022 146th keelimeguy 🇺🇸 1 353 187 24 Oct 2023 148th Secozzi 1 351 188 4 Nov 2020 148th rak1507 🇬🇧 1 351 188 28 Jan 2021 148th ArmaanAS 1 351 188 22 Mar 2021 148th silvncr 1 351 188 15 Jun 2021 148th Bonjour27891 🇻🇳 1 351 188 11 Mar 2022 148th StHagel 1 351 188 25 Aug 2023 154th RedzGoose 🇦🇺 1 349 189 17 Sep 2024 155th Macweese 1 342 193 3 Aug 2025 156th yzhs 🇩🇪 1 338 195 19 Mar 2021 157th h3ra993huskp 🇯🇵 1 324 204 13 Oct 2025 158th orifu 1 315 197 23 Feb 2021 159th SniperSmiley 🇺🇸 1 314 210 1 Aug 2022 160th tik25 1 313 144 28 Mar 2024 First Prev 81–160 of 213 Next Last