The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Roman to Arabic in all languages 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 641st annaproxy 681 157 30ms 11 May 2023 642nd mintypython 675 112 13ms 16 Oct 2018 642nd saramaebee 675 112 14ms 18 Oct 2018 642nd taklam 675 112 13ms 4 Jul 2020 642nd igmcdowell 675 112 14ms 4 Jan 2022 646th Jiramide 674 133 14ms 7 Feb 2021 647th ReidZ3 🇺🇸 674 165 319ms 13 Dec 2020 648th MeWhenI 🇻🇦 673 147 45ms 17 Feb 2023 649th DialFrost 🇸🇬 672 106 499ms 16 Nov 2024 650th SirBogman 🇺🇸 669 51 44ms 1 Sep 2022 651st vmcnabb 🇳🇿 669 113 13ms 6 May 2021 651st targrik 669 113 13ms 24 Feb 2025 653rd clockworknazo 668 114 21ms 20 Feb 2023 654th sean-niemann 🇺🇸 667 122 3ms 31 Oct 2023 655th MahlerFive 🇨🇦 667 186 328ms 24 Apr 2020 656th AlephSquirrel 666 55 4ms 8 Nov 2025 657th FlorianCassayre 🇫🇷 666 108 21ms 18 Sep 2023 658th MichalMarsalek 🇨🇿 666 135 360ms 30 Aug 2022 659th Natanaelel 🇸🇪 666 167 305ms 10 May 2025 660th MeWhenI 🇻🇦 666 271 150ms 29 Nov 2023 661st lionbryce 664 135 12ms 8 Aug 2024 662nd alexkunin 663 114 14ms 7 Jul 2019 663rd dokutan 663 138 148ms 13 Nov 2025 664th SirBogman 🇺🇸 663 182 43ms 17 Apr 2022 665th RaBa21 🇭🇺 659 109 18ms 12 Jul 2025 665th blaztoma 🇱🇹 659 109 17ms 26 days ago 667th sean-niemann 🇺🇸 657 153 87ms 11 Jul 2024 668th Bubbler-4 656 52 42ms 9 Dec 2021 668th DialFrost 🇸🇬 656 52 43ms 1 Feb 2023 670th Shanethegamer 🇺🇸 656 76 144ms 12 Dec 2021 671st KasperKivimaeki 🇫🇮 655 137 387ms 7 Nov 2025 672nd dokutan 654 137 13ms 20 Apr 2025 673rd SB-945 653 110 26ms 7 Apr 2024 673rd Troon 653 110 20ms 27 Aug 2025 675th varhammer 🇷🇺 653 121 157ms 13 Dec 2023 676th BBoehm 🇩🇪 652 116 13ms 21 Dec 2020 677th MeWhenI 🇻🇦 652 193 33ms 6 Jun 2023 678th hyvyys 646 117 14ms 19 Sep 2020 678th aksyristos 646 117 13ms 2 Nov 2022 680th edsrzf 🇳🇿 645 118 40ms 12 Nov 2025 681st villfa 645 121 15ms 2 Nov 2018 681st janbehrens 🇩🇪 645 121 358ms 16 May 2023 683rd keelimeguy 🇺🇸 642 112 23ms 17 May 2025 684th 386asm 🇺🇸 642 154 45ms 5 May 2023 685th user189032 641 118 14ms 29 May 2019 686th Shanethegamer 🇺🇸 641 127 4ms 28 May 2025 687th SirBogman 🇺🇸 640 101 561ms 20 Jan 2024 688th Shanethegamer 🇺🇸 640 120 27ms 17 Dec 2023 689th Yewzir 🇧🇪 640 122 343ms 10 Jun 2024 690th RockOfStone 640 140 15ms 17 Mar 2024 691st scpchicken 🇵🇼 639 78 218ms 4 May 2022 692nd mrondon8 638 158 514ms 5 Sep 2021 693rd snyderek 🇺🇸 636 158 58ms 9 Nov 2024 694th unfinishedprogram 635 119 12ms 12 Jul 2024 695th jared-hughes 635 141 14ms 16 Apr 2022 696th olligobber 🇦🇺 635 175 291ms 21 May 2020 697th MeWhenI 🇻🇦 634 101 923ms 15 Sep 2025 698th MeWhenI 🇻🇦 632 58 6ms 16 Jan 2022 699th CaedenHarper 🇨🇦 632 142 213ms 18 Aug 2025 700th stordev 631 114 20ms 26 Feb 2021 700th robin-scragg 631 114 20ms 24 Aug 2025 702nd PatrickStephansen 🇿🇦 630 120 25ms 9 Jun 2021 702nd stefangabos 🇷🇴 630 120 14ms 13 Sep 2022 704th HumanoidCPU 628 103 465ms 7 Jun 2024 705th janbehrens 🇩🇪 628 160 64ms 18 May 2023 706th Jiramide 628 177 296ms 8 Feb 2021 707th janbehrens 🇩🇪 626 161 590ms 16 May 2023 708th jupj 🇫🇮 622 131 3ms 27 Aug 2022 709th MeWhenI 🇻🇦 621 105 151ms 3 Aug 2024 710th YAJUE114514 621 179 292ms 3 Aug 2025 711th chartung17 620 116 22ms 1 Jan 2024 712th JOrE20 🇺🇸 620 122 15ms 7 Nov 2025 713th CaedenHarper 🇨🇦 616 78 47ms 18 Aug 2025 714th sebipopa 🇷🇴 615 123 13ms 14 Sep 2022 715th CaedenHarper 🇨🇦 614 116 481ms 17 Aug 2025 716th jacklynnepenick 614 117 19ms 13 Aug 2021 716th JunkIce 614 117 26ms 24 Nov 2024 718th Yewzir 🇧🇪 612 133 4ms 10 Jun 2024 719th neihousaigaai 610 124 15ms 28 Apr 2021 719th Andrey-Plotnikov 610 124 13ms 9 Aug 2025 First Prev 641–720 of 1,448 Next Last