The Calendar hole will go live in approximately 8 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 561st emgordon154 799 48 988ms 18 Nov 2024 562nd RedzGoose 🇦🇺 799 62 447ms 10 Sep 2024 562nd alemelis 799 62 2,420ms 20 Sep 2024 562nd albanian-laundromat 799 62 367ms 4 Aug 2025 562nd snoozingnewt 🇨🇦 799 62 380ms 10 Oct 2025 566th MeWhenI 🇻🇦 799 69 92ms 24 Nov 2022 567th blaztoma 🇱🇹 798 119 269ms 16 Aug 2025 568th Shanethegamer 🇺🇸 797 62 9ms 19 Nov 2022 568th jared-hughes 797 62 10ms 16 Mar 2023 568th raphaelimahorn 797 62 9ms 24 Mar 2023 568th Maznek 797 62 9ms 28 Jun 2023 568th unfinishedprogram 797 62 10ms 5 Jul 2023 573rd DialFrost 🇸🇬 796 47 15ms 25 Sep 2024 574th blaztoma 🇱🇹 796 96 61ms 17 Aug 2025 575th MeWhenI 🇻🇦 796 108 137ms 22 Jul 2024 576th Shanethegamer 🇺🇸 795 83 3,826ms 28 Oct 2024 577th albanian-laundromat 791 177 556ms 15 Oct 2025 578th mdnestor 790 66 38ms 23 Dec 2022 578th jared-hughes 790 66 12ms 16 Mar 2023 578th fgrosshans 🇫🇷 790 66 41ms 14 Jul 2024 578th codingisgreatbutiamnot 790 66 39ms 9 Aug 2024 578th hellwue 790 66 39ms 4 Sep 2024 578th iczelia 🇩🇪 790 66 41ms 23 Oct 2025 584th emplv 🇱🇻 790 82 99ms 25 Nov 2022 584th tobeannouncd 790 82 169ms 21 May 2024 586th bac0id 790 95 376ms 30 Jun 2024 587th rucin93 🇵🇱 789 70 17ms 26 Jul 2025 588th 09cf 789 109 124ms 26 Sep 2023 589th Natanaelel 🇸🇪 788 41 6ms 30 Dec 2022 589th o0lit3 🇺🇸 788 41 6ms 20 Jun 2023 591st MeWhenI 🇻🇦 786 46 54ms 24 Nov 2022 591st m-tkach 🇺🇦 786 46 46ms 31 Aug 2023 593rd 09cf 785 33 5ms 5 Sep 2023 593rd mousetail 🇳🇱 785 33 4ms 15 Mar 2024 593rd MeWhenI 🇻🇦 785 33 5ms 17 Feb 2025 596th Natanaelel 🇸🇪 784 63 10ms 21 Jul 2023 597th bac0id 784 75 2ms 27 Sep 2023 598th Shanethegamer 🇺🇸 783 120 30ms 27 Dec 2022 599th Andriamanitra 🇫🇮 782 49 1,021ms 18 Oct 2023 600th albanian-laundromat 781 56 726ms 22 Sep 2025 601st Alessandro-Balconi 🇮🇹 780 63 82ms 12 Jul 2023 602nd Irratix 🇳🇱 780 98 78ms 3 Aug 2023 602nd Emutis 🇱🇹 780 98 69ms 15 Aug 2025 604th vishwathg 778 67 29ms 4 Feb 2023 604th jamesthekee 778 67 14ms 25 Jan 2025 606th Shanethegamer 🇺🇸 776 80 3ms 19 Nov 2022 607th MeWhenI 🇻🇦 776 85 4,144ms 24 Oct 2024 608th albanian-laundromat 775 80 40ms 2 Sep 2025 609th DialFrost 🇸🇬 774 53 297ms 30 Jul 2024 610th namelessiw 774 64 367ms 5 Mar 2024 611th msbranicky 774 178 1,674ms 16 Sep 2025 612th BambooleanLogic 🇸🇪 772 64 9ms 2 Dec 2022 612th tayloia 🇬🇧 772 64 9ms 9 Jan 2023 612th Argeento 🇵🇱 772 64 10ms 29 Aug 2023 615th MeWhenI 🇻🇦 772 84 98ms 24 Nov 2022 616th Shanethegamer 🇺🇸 772 112 26ms 22 Nov 2022 617th jerrandolph 772 123 264ms 21 Dec 2023 618th janbehrens 🇩🇪 769 42 3ms 20 Nov 2022 618th SirBogman 🇺🇸 769 42 2ms 22 Nov 2022 620th Shanethegamer 🇺🇸 769 47 41ms 31 Jan 2023 620th olleicua 🇺🇸 769 47 52ms 5 Jan 2024 622nd MichalMarsalek 🇨🇿 767 68 20ms 20 Nov 2022 622nd NerdyMcNerd42 767 68 14ms 22 Jan 2023 622nd SB-945 767 68 14ms 19 Feb 2024 625th MeWhenI 🇻🇦 766 81 3ms 22 Jul 2024 625th frosster 766 81 3ms 16 Mar 2025 627th GolfingSuccess 🇬🇷 762 63 10ms 19 Dec 2024 628th Stockoh 🇫🇷 762 65 378ms 24 Jun 2024 628th TheZwierzLF 🇵🇱 762 65 356ms 12 days ago 630th strout 762 85 140ms 14 Dec 2023 631st MeWhenI 🇻🇦 758 53 2ms 10 Feb 2023 632nd andre-lameirinhas 🇵🇹 756 69 14ms 23 Feb 2023 632nd jtaxen 756 69 16ms 30 Mar 2024 632nd FranklinJiaChen 756 69 38ms 5 Aug 2024 632nd dokutan 756 69 38ms 15 Aug 2024 632nd webmiche 756 69 11ms 25 days ago 637th Babafaba 754 78 2ms 14 Oct 2025 638th KatieLG 🇬🇧 753 48 61ms 1 Sep 2024 639th yeminghan2021 750 102 62ms 1 Feb 2025 640th jared-hughes 748 50 13ms 22 Nov 2022 First Prev 561–640 of 1,630 Next Last