The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Farey Sequence 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 Ripick 665 94 120ms 24 Jun 2024 642nd HumanoidCPU 665 114 428ms 8 Nov 2025 643rd NickTheEASDude 🇺🇸 664 87 10ms 25 Apr 2024 644th BREMAUCY 🇫🇷 663 106 83ms 4 Dec 2023 645th Creative0708 🇨🇦 662 121 126ms 16 Dec 2023 645th mousetail 🇳🇱 662 121 128ms 24 Mar 2024 647th AlephSquirrel 659 81 418ms 16 Jan 2024 648th KrausRaus 🇺🇸 659 85 10ms 1 Dec 2023 648th jeff-at-tamer-dot-codes 🇺🇸 659 85 21ms 19 Dec 2023 650th MichalMarsalek 🇨🇿 658 95 140ms 1 Dec 2023 651st luuumine 🇫🇷 658 98 2ms 19 Nov 2025 652nd tobeannouncd 656 111 128ms 11 Jan 2024 653rd MeWhenI 🇻🇦 654 191 9ms 1 Dec 2023 654th KatieLG 🇬🇧 651 82 378ms 28 Oct 2024 655th Just4FunCoder 651 86 21ms 26 Feb 2024 655th SB-945 651 86 23ms 7 Apr 2024 655th Babafaba 651 86 19ms 22 Oct 2025 658th MeWhenI 🇻🇦 650 84 5ms 16 Aug 2024 659th SirFireball3521 648 62 208ms 13 Sep 2024 660th dokutan 648 149 319ms 10 Dec 2024 661st jatloe 644 87 22ms 24 Aug 2024 662nd alomiF 644 113 152ms 6 Dec 2023 663rd m42km 643 83 413ms 1 Feb 2024 664th snoozingnewt 🇨🇦 643 150 270ms 15 Oct 2025 665th jbt 641 90 10ms 24 Dec 2023 665th thisishowmymindworks 🇳🇴 641 90 10ms 28 Jun 2024 667th Yewzir 🇧🇪 639 92 137ms 27 Mar 2024 668th elgan65536 639 101 2ms 5 Dec 2023 668th madex 🇩🇪 639 101 2ms 13 Feb 2024 668th Herbert00709 🇵🇱 639 101 2ms 3 Sep 2024 671st snoozingnewt 🇨🇦 639 110 84ms 15 Oct 2025 672nd FlorianCassayre 🇫🇷 637 88 20ms 18 May 2024 672nd jacekwladzinski 637 88 10ms 3 Oct 2025 674th gifti258 637 99 75ms 8 Aug 2025 675th janbehrens 🇩🇪 634 91 9ms 1 Dec 2023 675th eranws 634 91 10ms 16 Mar 2024 675th HumanoidCPU 634 91 9ms 16 Nov 2025 678th northsuperman 633 102 2ms 24 Mar 2024 679th dokutan 633 104 2ms 26 Oct 2024 680th Yewzir 🇧🇪 633 111 84ms 5 Feb 2024 680th HumanoidCPU 633 111 83ms 5 Jun 2024 682nd lifthrasiir 🇰🇷 629 46 3ms 5 Dec 2024 683rd IISResetMe 629 67 804ms 4 Dec 2023 684th snoozingnewt 🇨🇦 624 109 109ms 18 days ago 685th msbranicky 624 235 1,619ms 16 Sep 2025 686th HumanoidCPU 622 67 34ms 5 Jun 2024 687th commandblockguy 🇺🇸 622 90 11ms 1 Dec 2023 687th ZakkkkAttackkkk 🇵🇭 622 90 11ms 9 May 2024 687th HumanoidCPU 622 90 20ms 5 Jun 2024 690th two-bad 🇬🇧 621 93 9ms 5 Feb 2024 690th helbling 🇨🇭 621 93 10ms 16 Jun 2024 690th snoozingnewt 🇨🇦 621 93 11ms 15 Oct 2025 693rd SirBogman 🇺🇸 620 68 271ms 18 May 2024 694th Babafaba 620 86 399ms 22 Oct 2025 695th iczelia 🇩🇪 620 104 2ms 10 Oct 2025 696th dokutan 619 237 1,728ms 19 Oct 2025 697th Daniel-Ellison 617 78 786ms 8 Aug 2025 698th msbranicky 617 154 25ms 3 Jan 2024 699th agreegious 616 91 10ms 17 Nov 2024 700th MeWhenI 🇻🇦 616 105 13ms 1 Dec 2023 701st Steffan153 🇫🇮 616 123 390ms 5 Dec 2023 701st Lydxn 🇨🇦 616 123 377ms 16 Dec 2023 703rd Andrey-Plotnikov 614 94 10ms 13 Jan 2025 704th bac0id 614 139 670ms 10 Jan 2025 705th Shanethegamer 🇺🇸 613 68 47ms 1 Dec 2023 706th Maximizer02 613 113 13ms 7 Nov 2024 707th dokutan 613 155 25ms 20 Apr 2025 708th dokutan 609 86 125ms 29 Oct 2024 709th FortuiteMan 🇫🇷 608 96 13ms 4 hours ago 710th uttumuttu 🇫🇮 608 101 90ms 21 Dec 2023 711th dokutan 606 94 776ms 23 Sep 2025 712th msbranicky 606 116 81ms 2 Jan 2024 713th h3ra993huskp 🇯🇵 606 125 469ms 18 days ago 714th dokutan 604 134 414ms 27 Sep 2025 715th annaproxy 603 107 2ms 20 Dec 2023 716th dcgjb 602 70 1,013ms 25 Mar 2024 717th ahmetdemirag 🇨🇾 602 93 11ms 9 Jun 2024 718th dokutan 602 113 96ms 31 Oct 2024 719th Yewzir 🇧🇪 601 96 10ms 5 Feb 2024 719th dokutan 601 96 9ms 15 Jun 2025 First Prev 641–720 of 1,473 Next Last