The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Sierpiński Triangle 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 401st rucin93 🇵🇱 776 55 3ms 11 Jul 2024 402nd nwellnhof 🇩🇪 776 70 1ms 16 Jul 2022 403rd sisyphus-ppcg 🇦🇺 776 72 2ms 22 Jan 2023 403rd inventshah 776 72 2ms 24 Jan 2023 405th janbehrens 🇩🇪 776 127 292ms 28 Nov 2023 406th neel11235813 775 69 344ms 15 Jan 2024 406th bizy-coder 775 69 345ms 17 Jan 2024 406th MeWhenI 🇻🇦 775 69 337ms 17 Jan 2024 406th CaedenHarper 🇨🇦 775 69 342ms 29 Jul 2025 410th IanUtley 775 79 8ms 26 Apr 2024 411th GrayJoKing 🇦🇺 774 88 40ms 23 Jan 2023 411th 386asm 🇺🇸 774 88 37ms 7 May 2023 413th jared-hughes 772 62 9ms 7 Mar 2022 413th janbehrens 🇩🇪 772 62 9ms 28 Nov 2023 415th SirBogman 🇺🇸 771 46 44ms 5 Oct 2022 416th jared-hughes 770 95 418ms 24 Jun 2022 417th steffan-polygolf 769 78 80ms 21 Feb 2024 418th error256 767 93 68ms 19 Jun 2025 419th dirckvdende 766 73 9ms 18 Jul 2025 420th jared-hughes 765 73 2ms 16 Mar 2022 421st namelessiw 765 84 358ms 7 Jun 2024 421st stefangimmillaro 765 84 384ms 20 Oct 2025 423rd timvermeulen 765 105 126ms 5 Jan 2020 423rd snobee 🇨🇦 765 105 151ms 12 Dec 2022 425th lynn 763 93 488ms 1 Mar 2022 426th DialFrost 🇸🇬 762 42 35ms 25 Jan 2023 427th cure-honey 🇯🇵 761 82 38ms 9 Jul 2021 428th voytxt 🇨🇿 760 63 8ms 1 Apr 2024 428th neel11235813 760 63 8ms 1 Apr 2024 428th duckyluuk 🇳🇱 760 63 9ms 5 Apr 2024 431st inventshah 759 73 2ms 11 Sep 2022 432nd MeWhenI 🇻🇦 758 75 131ms 3 Aug 2024 433rd edsrzf 🇳🇿 756 58 682ms 13 days ago 434th Attero 🇸🇪 756 74 10ms 30 Oct 2020 434th AlephSquirrel 756 74 13ms 24 Jan 2023 434th stefangimmillaro 756 74 10ms 11 Mar 2023 434th Shanethegamer 🇺🇸 756 74 9ms 8 Oct 2024 438th primo-ppcg 🇹🇭 756 134 1,696ms 9 Jun 2024 439th vonagam 755 64 35ms 9 Nov 2017 439th Waffle3z 755 64 39ms 22 Jan 2021 439th yzhs 🇩🇪 755 64 35ms 20 Jul 2022 442nd sean-niemann 🇺🇸 754 60 262ms 1 Jan 2024 443rd janbehrens 🇩🇪 754 97 402ms 29 Nov 2023 443rd Herbert00709 🇵🇱 754 97 72ms 15 Nov 2024 445th Babafaba 753 71 331ms 6 Nov 2025 446th MeWhenI 🇻🇦 753 131 287ms 27 Aug 2023 447th nullie 751 107 150ms 12 Mar 2025 448th somebody1234 748 64 9ms 28 Mar 2018 448th prplz 🇦🇺 748 64 8ms 1 Dec 2020 450th MeWhenI 🇻🇦 748 74 2ms 17 Nov 2022 451st janbehrens 🇩🇪 748 86 335ms 28 Nov 2023 452nd lynn 747 82 8ms 8 Dec 2021 453rd emgordon154 747 95 412ms 8 Jun 2025 454th vishwathg 746 75 10ms 3 Apr 2023 454th janbehrens 🇩🇪 746 75 10ms 28 Nov 2023 454th BREMAUCY 🇫🇷 746 75 10ms 1 Nov 2025 454th blaztoma 🇱🇹 746 75 11ms 2 hours ago 458th MeWhenI 🇻🇦 746 98 54ms 17 Nov 2022 458th m-tkach 🇺🇦 746 98 80ms 15 Dec 2022 458th Alex-x90 🇺🇸 746 98 64ms 28 Sep 2023 461st janbehrens 🇩🇪 745 75 2ms 29 Nov 2023 462nd Yewzir 🇧🇪 745 103 8ms 24 Dec 2023 463rd jared-hughes 744 77 72ms 19 Jul 2022 463rd rucin93 🇵🇱 744 77 64ms 12 Oct 2025 465th janbehrens 🇩🇪 743 65 42ms 30 May 2022 465th tatzyr 🇯🇵 743 65 52ms 25 Nov 2024 467th janbehrens 🇩🇪 742 66 5ms 28 Nov 2023 468th AlephSquirrel 742 72 525ms 21 Jan 2024 469th MeWhenI 🇻🇦 742 95 492ms 7 Nov 2025 470th clockworknazo 742 100 3ms 6 Mar 2023 471st cure-honey 🇯🇵 741 133 292ms 9 Jul 2021 472nd iznax 739 87 304ms 21 Nov 2021 473rd MeepMoop 739 88 2ms 9 Apr 2025 474th janbehrens 🇩🇪 739 96 459ms 28 Nov 2023 475th Shanethegamer 🇺🇸 738 75 2ms 11 Sep 2022 476th dunkyl 738 89 1,295ms 16 Nov 2023 477th Maznek 736 65 10ms 25 Jun 2023 478th daedals 736 76 10ms 14 May 2019 478th petar-donchev 736 76 10ms 8 Sep 2019 478th jared-hughes 736 76 9ms 10 Sep 2022 First Prev 401–480 of 2,057 Next Last