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 801st Lydxn 🇨🇦 639 124 371ms 24 Jun 2023 802nd Shanethegamer 🇺🇸 638 77 93ms 12 Dec 2022 803rd TaserTheFox 🇺🇸 636 82 15ms 31 Mar 2023 803rd StefanHabel 🇨🇦 636 82 15ms 21 Apr 2024 805th ericlangedijk 🇸🇮 636 118 380ms 23 May 2023 806th epic-programmer-guy 635 102 188ms 3 Jan 2024 807th edsrzf 🇳🇿 634 98 17ms 6 Jan 2025 808th Steffan153 🇫🇮 634 125 392ms 14 Aug 2024 809th Lv0Sys 🇵🇱 633 78 13ms 17 days ago 810th glesnick 628 83 51ms 23 Nov 2022 810th Yewzir 🇧🇪 628 83 14ms 7 Feb 2024 810th wh3n3v3r 🇨🇿 628 83 14ms 14 Nov 2024 813th snoozingnewt 🇨🇦 628 105 48ms 13 Oct 2025 814th madex 🇩🇪 626 94 3ms 14 Jun 2023 814th msbranicky 626 94 2ms 10 Jan 2024 816th emgordon154 625 68 141ms 9 Aug 2024 817th olleicua 🇺🇸 625 79 14ms 19 Jan 2024 818th janbehrens 🇩🇪 624 127 367ms 21 Nov 2022 819th blaztoma 🇱🇹 622 151 26ms 3 Sep 2025 820th twocatsinatrenchcoat 621 84 15ms 29 Nov 2022 820th FortuiteMan 🇫🇷 621 84 15ms 21 Jul 2025 822nd blaztoma 🇱🇹 620 107 26ms 2 Sep 2025 823rd rucin93 🇵🇱 619 80 458ms 10 Feb 2024 823rd JunkIce 619 80 453ms 26 Dec 2024 823rd fuzzylojik-golf 🇺🇸 619 80 399ms 6 Jul 2025 826th Shanethegamer 🇺🇸 619 120 45ms 12 Sep 2024 827th blaztoma 🇱🇹 617 80 10ms 2 Sep 2025 828th snoozingnewt 🇨🇦 617 105 151ms 13 Oct 2025 829th blaztoma 🇱🇹 616 118 168ms 2 Sep 2025 830th MeWhenI 🇻🇦 615 101 2ms 24 Nov 2022 830th msbranicky 615 101 19ms 4 Aug 2023 832nd Yewzir 🇧🇪 611 81 445ms 7 Feb 2024 833rd yzhs 🇩🇪 611 106 139ms 25 Jun 2023 834th emgordon154 610 71 25ms 19 Sep 2024 835th emgordon154 609 205 4,290ms 18 Jul 2024 836th blaztoma 🇱🇹 608 72 809ms 3 Sep 2025 836th MeWhenI 🇻🇦 608 72 689ms 15 Sep 2025 838th blaztoma 🇱🇹 608 138 1,274ms 2 Sep 2025 839th AZ9tumas 607 86 14ms 17 Dec 2022 839th jmerle 🇳🇱 607 86 19ms 11 Jul 2023 839th Mikey-Beep 🇬🇧 607 86 15ms 2 Jun 2024 839th khaninm 607 86 24ms 4 Jun 2025 843rd MeWhenI 🇻🇦 604 82 296ms 15 Feb 2023 844th retrohun 603 62 304ms 11 Mar 2023 845th Feniske 🇫🇷 603 68 257ms 6 Nov 2023 846th SwordF-Official 603 103 12ms 17 Apr 2025 847th blaztoma 🇱🇹 602 60 36ms 2 Sep 2025 848th alexsave 602 82 13ms 15 Nov 2025 849th blaztoma 🇱🇹 602 229 1,685ms 15 Sep 2025 850th Bmrl7 600 98 2ms 12 Feb 2024 851st Ripick 600 110 367ms 24 Jun 2024 852nd Emutis 🇱🇹 600 132 363ms 4 Sep 2025 853rd Shanethegamer 🇺🇸 598 54 2ms 19 Nov 2022 853rd snoozingnewt 🇨🇦 598 54 3ms 13 Oct 2025 855th Shanethegamer 🇺🇸 597 104 62ms 22 Dec 2023 855th Yewzir 🇧🇪 597 104 25ms 7 Feb 2024 857th IISResetMe 595 69 248ms 30 Jun 2023 858th blaztoma 🇱🇹 592 105 2ms 4 Sep 2025 859th CarsonChr 🇺🇸 588 84 13ms 7 Apr 2024 860th bac0id 587 135 426ms 27 Sep 2023 860th blaztoma 🇱🇹 587 135 362ms 2 Sep 2025 862nd Just4FunCoder 586 89 42ms 23 Mar 2023 863rd msbranicky 586 162 272ms 21 Aug 2023 864th blaztoma 🇱🇹 584 64 8ms 17 Aug 2025 865th msbranicky 584 113 3,363ms 9 Jan 2025 865th snoozingnewt 🇨🇦 584 113 3,172ms 13 Oct 2025 867th dokutan 583 75 702ms 29 Aug 2025 868th yoshykai 583 136 403ms 15 Apr 2025 869th snoozingnewt 🇨🇦 582 125 409ms 13 Oct 2025 870th madeforlosers 581 85 342ms 21 Oct 2024 871st SirFireball3521 580 90 14ms 23 Jan 2023 871st yuchuehw 580 90 15ms 10 Feb 2024 873rd blaztoma 🇱🇹 580 95 94ms 4 Sep 2025 874th Yewzir 🇧🇪 579 112 101ms 28 Mar 2024 875th blaztoma 🇱🇹 579 114 39ms 2 Sep 2025 876th weeble 578 75 27ms 24 Dec 2024 877th Natanaelel 🇸🇪 577 149 151ms 27 Jul 2025 878th aksyristos 574 63 614ms 9 Feb 2023 879th acollett89 574 86 10ms 4 Aug 2025 880th LeeCamp 573 91 33ms 8 Jan 2023 First Prev 801–880 of 1,631 Next Last