The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Sierpiński Triangle in Ruby 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 1st Lydxn 🇨🇦 1,000 50 46ms 31 Oct 2021 1st JayXon 🇺🇸 1,000 50 44ms 27 Jan 2023 3rd nwellnhof 🇩🇪 980 51 47ms 25 May 2022 3rd Steffan153 🇫🇮 980 51 33ms 7 Aug 2024 3rd sean-niemann 🇺🇸 980 51 35ms 19 Aug 2024 6th primo-ppcg 🇹🇭 943 53 37ms 5 Jun 2021 7th MeWhenI 🇻🇦 909 55 32ms 17 Nov 2022 7th stefangimmillaro 909 55 35ms 11 Jan 2023 7th Irratix 🇳🇱 909 55 45ms 19 Jan 2023 10th sisyphus-ppcg 🇦🇺 893 56 36ms 22 Jan 2023 10th ovs-code 🇩🇪 893 56 42ms 8 Jun 2024 10th anter69 🇭🇺 893 56 51ms 21 Oct 2024 10th pardouin 🇫🇷 893 56 38ms 11 Aug 2025 14th hiddicop 🇸🇪 877 57 48ms 31 Jan 2021 14th olivermrose 🇺🇸 877 57 36ms 7 Oct 2021 14th DialFrost 🇸🇬 877 57 32ms 28 Nov 2023 14th blaztoma 🇱🇹 877 57 37ms 6 hours ago 18th janlelis 847 59 41ms 5 Jan 2020 18th prplz 🇦🇺 847 59 35ms 5 Jun 2020 18th KatieLG 🇬🇧 847 59 38ms 19 Oct 2021 18th jared-hughes 847 59 45ms 12 Sep 2022 18th GrayJoKing 🇦🇺 847 59 36ms 21 Jan 2023 23rd SirBogman 🇺🇸 833 60 37ms 4 Dec 2022 24th Shanethegamer 🇺🇸 820 61 37ms 20 Aug 2021 25th proton 🇩🇪 806 62 37ms 9 Jun 2020 25th jaredcrystal 🇺🇸 806 62 41ms 14 Dec 2020 27th vonagam 781 64 35ms 9 Nov 2017 27th Waffle3z 781 64 39ms 22 Jan 2021 27th yzhs 🇩🇪 781 64 35ms 20 Jul 2022 30th janbehrens 🇩🇪 769 65 42ms 30 May 2022 30th tatzyr 🇯🇵 769 65 52ms 25 Nov 2024 32nd greghull 746 67 32ms 9 Nov 2017 32nd Natanaelel 🇸🇪 746 67 36ms 2 Nov 2021 34th emgordon154 735 68 48ms 19 Nov 2025 35th D-MOVE 🇵🇭 725 69 48ms 10 days ago 36th TheZwierzLF 🇵🇱 704 71 44ms 2 days ago 37th HumanoidCPU 667 75 38ms 2 Jun 2024 38th hrrs01 649 77 51ms 5 Feb 2018 38th FlyingPenguin223 649 77 33ms 23 Sep 2024 40th n1LS 641 78 43ms 9 Oct 2019 41st DaCuteRaccoon 610 82 34ms 27 Apr 2022 41st aksyristos 610 82 36ms 31 Jan 2023 43rd olleicua 🇺🇸 602 83 37ms 15 Feb 2024 44th biinari 515 97 33ms 26 Mar 2018 45th graft 472 106 34ms 11 Mar 2018 46th yokasuretsu 420 119 43ms 23 Apr 2018 47th msbranicky 316 158 44ms 15 Sep 2023 48th dokutan 279 179 37ms 12 Mar 2025 49th Ralac07 🇦🇺 128 391 39ms 14 Jun 2024 50th JRaspass 🇬🇧 89 559 35ms 12 Feb 2018 50th retrohun 89 559 35ms 21 Dec 2018 50th jstanley0 89 559 41ms 12 Dec 2020 50th kurkale6ka 89 559 36ms 15 Jul 2021 50th KatieLG-Transpiler 🇬🇧 89 559 36ms 24 Jun 2022 50th Haksell 🇦🇶 89 559 44ms 22 Feb 2023 50th Mabeloid 🇳🇴 89 559 46ms 22 Sep 2024 50th CaedenHarper 🇨🇦 89 559 40ms 16 Aug 2025 58th babcockd 89 560 36ms 5 Jan 2018 59th mokymok 🇺🇸 87 574 43ms 10 Nov 2021 60th sshanks49 87 577 35ms 26 Feb 2020 1–60 of 60