The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Inventory 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 CaedenHarper 🇨🇦 748 66 9ms 23 Aug 2025 640th snoozingnewt 🇨🇦 748 66 9ms 13 Oct 2025 640th iczelia 🇩🇪 748 66 10ms 23 Oct 2025 644th msbranicky 747 74 2ms 10 Oct 2023 645th pardouin 🇫🇷 745 57 129ms 26 Jul 2025 646th b10011 🇫🇮 745 70 16ms 9 Jan 2023 646th knutae 🇳🇴 745 70 14ms 29 Dec 2023 646th wobblybits 745 70 14ms 18 Aug 2025 646th jacekwladzinski 745 70 27ms 4 Oct 2025 650th blaztoma 🇱🇹 744 54 2ms 2 Sep 2025 651st MichalMarsalek 🇨🇿 741 89 359ms 20 Nov 2022 652nd snoozingnewt 🇨🇦 739 84 2ms 13 Oct 2025 653rd anter69 🇭🇺 738 49 53ms 9 Feb 2023 654th madex 🇩🇪 735 71 21ms 13 Jun 2023 654th tri1212 🇻🇳 735 71 42ms 30 Jun 2024 654th PyryL 🇫🇮 735 71 14ms 23 Aug 2024 654th Europe2048 735 71 18ms 24 Nov 2024 654th YAJUE114514 735 71 15ms 13 Jul 2025 654th madeforlosers 735 71 14ms 13 Nov 2025 660th klixel 🇨🇦 735 104 394ms 17 Oct 2024 661st MeWhenI 🇻🇦 735 197 13ms 1 Aug 2023 662nd JRaspass 🇬🇧 734 44 2ms 20 Nov 2022 663rd frankgraziano 733 51 166ms 27 Feb 2025 664th blaztoma 🇱🇹 733 90 3,591ms 2 Sep 2025 665th ovs-code 🇩🇪 732 58 127ms 3 Aug 2024 666th edsrzf 🇳🇿 732 81 24ms 17 Jan 2025 667th kg583 🇺🇸 731 85 17ms 13 days ago 668th Shanethegamer 🇺🇸 730 55 6ms 22 Nov 2022 668th snoozingnewt 🇨🇦 730 55 2ms 13 Oct 2025 670th msbranicky 729 103 318ms 10 Jan 2024 671st blaztoma 🇱🇹 728 89 96ms 17 Aug 2025 672nd emgordon154 728 123 111ms 12 days ago 673rd MeWhenI 🇻🇦 728 129 29ms 5 Jun 2023 674th SirBogman 🇺🇸 726 43 251ms 20 Nov 2022 675th Irratix 🇳🇱 726 81 2ms 11 Dec 2022 676th ovs-code 🇩🇪 726 95 28ms 2 Jul 2024 677th emgordon154 725 91 4,190ms 28 Oct 2024 678th msbranicky 724 72 16ms 19 Aug 2023 678th adamnielson42 🇺🇸 724 72 14ms 21 Aug 2023 678th Masttest 724 72 14ms 15 Feb 2024 678th Code-Coder-coder 724 72 13ms 24 days ago 682nd TFeld00 🇩🇰 723 50 42ms 3 Sep 2024 683rd KatieLG 🇬🇧 723 53 948ms 3 Jan 2024 684th Shanethegamer 🇺🇸 722 86 8ms 23 Nov 2022 684th blaztoma 🇱🇹 722 86 2ms 2 Sep 2025 686th MeWhenI 🇻🇦 721 92 16ms 21 May 2023 687th annaproxy 721 106 60ms 23 Jan 2023 687th Babafaba 721 106 2,555ms 14 Oct 2025 689th angel-p57 🇯🇵 721 236 5ms 7 Dec 2023 690th Shanethegamer 🇺🇸 720 57 246ms 19 Nov 2022 691st DialFrost 🇸🇬 718 69 507ms 31 Jul 2024 691st dokutan 718 69 394ms 15 Aug 2024 693rd klixel 🇨🇦 717 82 2ms 17 Oct 2024 694th Shanethegamer 🇺🇸 716 77 125ms 22 Nov 2022 695th ovs-code 🇩🇪 715 65 75ms 19 Sep 2023 696th jhpaques 🇫🇷 714 73 39ms 30 Nov 2022 696th Andrey135296 714 73 16ms 21 Sep 2024 698th snoozingnewt 🇨🇦 714 133 269ms 13 Oct 2025 699th kg583 🇺🇸 712 73 26ms 27 Dec 2024 699th CLOStrophobic 🇮🇹 712 73 25ms 18 Feb 2025 701st MeWhenI 🇻🇦 711 118 1,245ms 14 Jun 2023 702nd anter69 🇭🇺 710 54 971ms 24 Feb 2023 703rd blaztoma 🇱🇹 710 121 122ms 2 Sep 2025 704th edsrzf 🇳🇿 709 93 369ms 20 Jun 2025 705th postie77 708 106 342ms 19 May 2023 706th msbranicky 708 108 53ms 10 Jan 2024 707th Jacob385 708 112 440ms 27 Oct 2025 708th trinityy-7 706 70 14ms 17 Mar 2024 709th Steffan153 🇫🇮 706 88 34ms 20 Feb 2024 709th albanian-laundromat 706 88 25ms 22 Jul 2025 711th albanian-laundromat 706 205 12ms 26 Sep 2025 712th za3k 705 74 11ms 20 Nov 2022 712th MaxElf999 705 74 21ms 21 Nov 2022 712th celiendonze 🇨🇭 705 74 15ms 25 Apr 2023 712th willschremmer 705 74 20ms 11 May 2024 712th moustave 705 74 32ms 2 Dec 2024 717th RockOfStone 705 88 2ms 9 Mar 2024 718th MeWhenI 🇻🇦 702 46 2ms 15 Apr 2023 719th blaztoma 🇱🇹 702 70 89ms 17 Aug 2025 720th msbranicky 699 123 117ms 19 Sep 2023 First Prev 641–720 of 1,628 Next Last