The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Farey Sequence in all languages 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 Points Bytes Time Submitted 640th eiburns 676 94 10ms 13 Dec 2023 640th msbranicky 676 94 11ms 1 Jan 2024 640th InigoK 🇺🇸 676 94 10ms 29 Aug 2025 644th MeWhenI 🇻🇦 675 82 7ms 1 Dec 2023 645th the-zammers 674 108 129ms 15 Dec 2023 646th Shanethegamer 🇺🇸 673 106 14ms 31 Jan 2024 646th AlephSquirrel 673 106 11ms 24 Jun 2024 648th TheZwierzLF 🇵🇱 672 62 37ms 6 hours ago 649th kmathis22 670 113 542ms 18 days ago 650th janbehrens 🇩🇪 669 95 11ms 1 Dec 2023 650th wuzekai518 669 95 11ms 16 Jul 2024 650th CoolBvll 669 95 10ms 13 Jun 2025 650th Techdude01 669 95 11ms 14 Aug 2025 654th luuumine 🇫🇷 668 120 113ms 19 Nov 2025 655th janbehrens 🇩🇪 667 83 7ms 1 Dec 2023 656th Babafaba 667 92 480ms 22 Oct 2025 657th Ripick 665 94 120ms 24 Jun 2024 658th HumanoidCPU 665 114 428ms 8 Nov 2025 659th NickTheEASDude 🇺🇸 664 87 10ms 25 Apr 2024 660th BREMAUCY 🇫🇷 663 106 83ms 4 Dec 2023 661st Creative0708 🇨🇦 662 121 122ms 16 Dec 2023 661st mousetail 🇳🇱 662 121 128ms 24 Mar 2024 663rd MichalMarsalek 🇨🇿 658 95 140ms 1 Dec 2023 664th luuumine 🇫🇷 658 98 2ms 19 Nov 2025 665th tobeannouncd 656 111 128ms 11 Jan 2024 666th MeWhenI 🇻🇦 654 191 9ms 1 Dec 2023 667th msbranicky 653 94 451ms 17 Jan 2024 668th MeWhenI 🇻🇦 650 84 5ms 16 Aug 2024 669th bac0id 649 98 11ms 10 Jan 2025 669th Troon 649 98 10ms 18 Feb 2025 671st dokutan 648 149 319ms 10 Dec 2024 672nd alomiF 644 113 152ms 6 Dec 2023 673rd snoozingnewt 🇨🇦 643 150 270ms 15 Oct 2025 674th Ripick 642 99 10ms 1 Dec 2023 674th firegene 🇮🇪 642 99 11ms 3 Dec 2023 674th hellwue 642 99 11ms 22 Feb 2024 677th jbt 641 90 10ms 24 Dec 2023 678th Daniel-Ellison 639 78 661ms 8 Aug 2025 679th Yewzir 🇧🇪 639 92 137ms 27 Mar 2024 680th elgan65536 639 101 2ms 5 Dec 2023 680th madex 🇩🇪 639 101 2ms 13 Feb 2024 680th Herbert00709 🇵🇱 639 101 2ms 3 Sep 2024 683rd snoozingnewt 🇨🇦 639 110 84ms 15 Oct 2025 684th gifti258 637 99 69ms 8 Aug 2025 685th janbehrens 🇩🇪 634 91 9ms 1 Dec 2023 685th eranws 634 91 10ms 16 Mar 2024 687th northsuperman 633 102 2ms 24 Mar 2024 688th dokutan 633 104 2ms 26 Oct 2024 689th Yewzir 🇧🇪 633 111 83ms 5 Feb 2024 689th HumanoidCPU 633 111 83ms 5 Jun 2024 691st lifthrasiir 🇰🇷 629 46 3ms 5 Dec 2024 692nd IISResetMe 629 67 804ms 4 Dec 2023 693rd 051 🇸🇬 629 101 11ms 24 Dec 2023 694th snoozingnewt 🇨🇦 624 109 109ms 24 days ago 695th WillConker 623 102 26ms 10 Mar 2024 695th FlorianCassayre 🇫🇷 623 102 11ms 18 May 2024 697th two-bad 🇬🇧 621 93 9ms 5 Feb 2024 697th helbling 🇨🇭 621 93 10ms 16 Jun 2024 697th thisishowmymindworks 🇳🇴 621 93 11ms 28 Jun 2024 700th iczelia 🇩🇪 620 104 2ms 10 Oct 2025 701st markusgraube 617 103 10ms 22 Jun 2024 702nd msbranicky 617 154 25ms 3 Jan 2024 703rd MeWhenI 🇻🇦 616 105 13ms 1 Dec 2023 704th Steffan153 🇫🇮 616 123 390ms 5 Dec 2023 704th Lydxn 🇨🇦 616 123 377ms 16 Dec 2023 706th Andrey-Plotnikov 614 94 10ms 13 Jan 2025 707th bac0id 614 139 438ms 10 Jan 2025 708th Shanethegamer 🇺🇸 613 68 35ms 1 Dec 2023 709th FortuiteMan 🇫🇷 613 98 12ms 6 days ago 710th Maximizer02 613 113 13ms 7 Nov 2024 711th dokutan 613 155 25ms 20 Apr 2025 712th KadinSchultz 611 104 9ms 4 Dec 2023 712th cros107 🇦🇺 611 104 10ms 26 Dec 2023 712th dokutan 611 104 12ms 28 Oct 2024 715th HumanoidCPU 608 95 10ms 16 Nov 2025 716th uttumuttu 🇫🇮 608 101 90ms 21 Dec 2023 717th msbranicky 606 116 81ms 2 Jan 2024 718th h3ra993huskp 🇯🇵 606 125 469ms 24 days ago 719th madex 🇩🇪 605 105 11ms 21 May 2024 720th dokutan 604 134 414ms 27 Sep 2025 First Prev 641–720 of 1,483 Next Last