The Calendar hole will go live in approximately 7 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 641st jared-hughes 748 50 9ms 22 Nov 2022 642nd bac0id 748 66 10ms 30 Jun 2024 642nd CaedenHarper 🇨🇦 748 66 9ms 23 Aug 2025 642nd snoozingnewt 🇨🇦 748 66 9ms 13 Oct 2025 642nd iczelia 🇩🇪 748 66 10ms 23 Oct 2025 646th msbranicky 747 74 2ms 10 Oct 2023 647th pardouin 🇫🇷 745 57 129ms 26 Jul 2025 648th b10011 🇫🇮 745 70 16ms 9 Jan 2023 648th knutae 🇳🇴 745 70 14ms 29 Dec 2023 648th wobblybits 745 70 14ms 18 Aug 2025 648th jacekwladzinski 745 70 27ms 4 Oct 2025 652nd blaztoma 🇱🇹 744 54 2ms 2 Sep 2025 652nd albanian-laundromat 744 54 2ms 3 days ago 654th MichalMarsalek 🇨🇿 742 89 359ms 20 Nov 2022 655th snoozingnewt 🇨🇦 739 84 2ms 13 Oct 2025 656th anter69 🇭🇺 738 49 42ms 9 Feb 2023 657th madex 🇩🇪 735 71 21ms 13 Jun 2023 657th tri1212 🇻🇳 735 71 42ms 30 Jun 2024 657th PyryL 🇫🇮 735 71 14ms 23 Aug 2024 657th Europe2048 735 71 18ms 24 Nov 2024 657th YAJUE114514 735 71 15ms 13 Jul 2025 657th madeforlosers 735 71 14ms 13 Nov 2025 663rd klixel 🇨🇦 735 104 394ms 17 Oct 2024 664th MeWhenI 🇻🇦 735 197 13ms 1 Aug 2023 665th JRaspass 🇬🇧 734 44 2ms 20 Nov 2022 666th frankgraziano 733 51 136ms 27 Feb 2025 667th blaztoma 🇱🇹 733 90 3,296ms 2 Sep 2025 668th ovs-code 🇩🇪 732 58 127ms 3 Aug 2024 669th edsrzf 🇳🇿 732 81 24ms 17 Jan 2025 670th kg583 🇺🇸 731 85 17ms 19 days ago 671st Shanethegamer 🇺🇸 730 55 6ms 22 Nov 2022 671st snoozingnewt 🇨🇦 730 55 2ms 13 Oct 2025 673rd msbranicky 729 103 318ms 10 Jan 2024 674th blaztoma 🇱🇹 728 89 96ms 17 Aug 2025 675th emgordon154 728 123 111ms 18 days ago 676th MeWhenI 🇻🇦 728 129 29ms 5 Jun 2023 677th SirBogman 🇺🇸 726 43 204ms 20 Nov 2022 678th Irratix 🇳🇱 726 81 2ms 11 Dec 2022 679th ovs-code 🇩🇪 726 95 28ms 2 Jul 2024 680th emgordon154 725 91 3,177ms 28 Oct 2024 681st msbranicky 724 72 16ms 19 Aug 2023 681st adamnielson42 🇺🇸 724 72 14ms 21 Aug 2023 681st Masttest 724 72 14ms 15 Feb 2024 681st Code-Coder-coder 724 72 13ms 24 Nov 2025 685th TFeld00 🇩🇰 723 50 39ms 3 Sep 2024 686th KatieLG 🇬🇧 723 53 948ms 3 Jan 2024 687th Shanethegamer 🇺🇸 722 86 8ms 23 Nov 2022 687th blaztoma 🇱🇹 722 86 2ms 2 Sep 2025 689th MeWhenI 🇻🇦 721 92 16ms 21 May 2023 690th annaproxy 721 106 60ms 23 Jan 2023 690th Babafaba 721 106 2,228ms 14 Oct 2025 692nd angel-p57 🇯🇵 721 236 5ms 7 Dec 2023 693rd Shanethegamer 🇺🇸 720 57 246ms 19 Nov 2022 694th DialFrost 🇸🇬 718 69 338ms 31 Jul 2024 694th dokutan 718 69 394ms 15 Aug 2024 696th klixel 🇨🇦 717 82 2ms 17 Oct 2024 697th Shanethegamer 🇺🇸 716 77 125ms 22 Nov 2022 698th ovs-code 🇩🇪 715 65 74ms 19 Sep 2023 699th jhpaques 🇫🇷 715 73 39ms 30 Nov 2022 699th Andrey135296 715 73 16ms 21 Sep 2024 701st snoozingnewt 🇨🇦 714 133 269ms 13 Oct 2025 702nd kg583 🇺🇸 712 73 26ms 27 Dec 2024 702nd CLOStrophobic 🇮🇹 712 73 25ms 18 Feb 2025 704th MeWhenI 🇻🇦 711 118 1,245ms 14 Jun 2023 705th anter69 🇭🇺 710 54 971ms 24 Feb 2023 706th edsrzf 🇳🇿 710 93 369ms 20 Jun 2025 707th blaztoma 🇱🇹 710 121 122ms 2 Sep 2025 708th postie77 708 106 342ms 19 May 2023 709th msbranicky 708 108 53ms 10 Jan 2024 710th Jacob385 708 112 440ms 27 Oct 2025 711th trinityy-7 706 70 14ms 17 Mar 2024 712th Steffan153 🇫🇮 706 88 34ms 20 Feb 2024 712th albanian-laundromat 706 88 25ms 22 Jul 2025 714th albanian-laundromat 706 205 12ms 26 Sep 2025 715th za3k 705 74 11ms 20 Nov 2022 715th MaxElf999 705 74 21ms 21 Nov 2022 715th celiendonze 🇨🇭 705 74 15ms 25 Apr 2023 715th willschremmer 705 74 20ms 11 May 2024 715th moustave 705 74 32ms 2 Dec 2024 720th RockOfStone 705 88 2ms 9 Mar 2024 First Prev 641–720 of 1,631 Next Last