The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Collatz in all languages in chars. 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 Chars Time Submitted 632nd tvcv901 874 61 10ms 22 Mar 2023 632nd unfinishedprogram 874 61 10ms 19 Jul 2023 632nd snoozingnewt 🇨🇦 874 61 10ms 23 Sep 2023 632nd funnyboy-roks 874 61 10ms 9 May 2024 632nd bac0id 874 61 10ms 29 Jun 2024 632nd madex 🇩🇪 874 61 10ms 9 Jul 2024 632nd FortuiteMan 🇫🇷 874 61 9ms 10 Oct 2024 632nd RobertHoeh 874 61 13ms 5 Apr 2025 632nd LvLError 874 61 10ms 29 May 2025 632nd miles-evan 874 61 10ms 5 Aug 2025 632nd alexsave 874 61 10ms 13 Oct 2025 652nd dokutan 873 62 5ms 28 Apr 2025 653rd NerdyMcNerd42 873 64 19ms 26 Oct 2022 653rd tpasfieldERAU 873 64 23ms 14 Nov 2022 653rd CheeseCake628 🇳🇴 873 64 22ms 6 Jan 2023 653rd adamnielson42 🇺🇸 873 64 19ms 25 Apr 2023 653rd nathsou 🇫🇷 873 64 19ms 2 Sep 2023 653rd zwxzwxzwx21 873 64 25ms 30 Jan 2024 653rd steffan-polygolf 873 64 19ms 8 Mar 2024 653rd Jacob385 873 64 57ms 4 Apr 2024 653rd gallium-gonzollium 873 64 28ms 26 Aug 2024 662nd Shanethegamer 🇺🇸 873 66 172ms 4 May 2022 662nd scpchicken 🇵🇼 873 66 254ms 5 May 2022 662nd sisyphus-ppcg 🇦🇺 873 66 174ms 6 May 2022 662nd Natanaelel 🇸🇪 873 66 144ms 15 Jun 2022 662nd Z-snails 873 66 254ms 27 Feb 2023 662nd Jeremy-Stafford 873 66 258ms 27 Feb 2023 662nd alomiF 873 66 293ms 1 Sep 2023 662nd btnlq 873 66 145ms 17 Oct 2023 670th johnnythedoggie 873 72 91ms 13 May 2022 670th kaascevich 873 72 90ms 8 Jul 2025 672nd DialFrost 🇸🇬 873 73 83ms 3 Jun 2025 673rd HPWiz 🇳🇿 872 49 249ms 4 May 2022 673rd JayXon 🇺🇸 872 49 254ms 5 May 2022 673rd Steffan153 🇫🇮 872 49 287ms 10 Dec 2022 673rd ovs-code 🇩🇪 872 49 389ms 24 Oct 2023 673rd sean-niemann 🇺🇸 872 49 271ms 12 Jul 2024 678th DialFrost 🇸🇬 872 86 40ms 24 Oct 2024 678th stefangimmillaro 872 86 39ms 14 Jan 2025 680th c0d3-4-F00d 🇩🇪 872 89 370ms 5 May 2022 680th fkantelberg 872 89 340ms 15 Jul 2023 680th bac0id 872 89 336ms 26 Sep 2023 680th TRexOnGit 872 89 378ms 16 Feb 2024 684th emgordon154 872 96 128ms 20 days ago 685th inventshah 872 97 58ms 6 May 2022 685th roupiq 🇵🇱 872 97 55ms 22 Nov 2023 687th MeWhenI 🇻🇦 872 109 278ms 9 Feb 2023 688th janbehrens 🇩🇪 871 90 442ms 21 Apr 2023 688th Yewzir 🇧🇪 871 90 426ms 22 Apr 2023 688th Ripick 871 90 439ms 27 Nov 2024 688th emgordon154 871 90 368ms 14 days ago 692nd AlephSquirrel 870 80 12ms 20 Apr 2023 692nd ashtraypettingzoo 🇺🇸 870 80 15ms 1 Apr 2024 694th GolfingSuccess 🇬🇷 869 71 2ms 5 May 2022 694th emplv 🇱🇻 869 71 2ms 5 May 2022 694th JayXon 🇺🇸 869 71 2ms 7 May 2022 694th m-tkach 🇺🇦 869 71 2ms 15 May 2022 694th nwellnhof 🇩🇪 869 71 2ms 5 Jun 2022 694th Irratix 🇳🇱 869 71 2ms 13 Jun 2022 694th michael-pruglo 🇺🇦 869 71 2ms 13 Jul 2022 694th stefangimmillaro 869 71 2ms 2 Jun 2023 694th kkoenig 869 71 2ms 21 Dec 2023 694th JohandeRuiter 🇳🇱 869 71 2ms 14 Sep 2024 694th masinag 🇮🇹 869 71 2ms 6 Oct 2024 705th dokutan 868 82 23ms 1 Jul 2024 706th nwellnhof 🇩🇪 867 53 6ms 4 May 2022 706th GrayJoKing 🇦🇺 867 53 7ms 6 May 2022 708th albanian-laundromat 867 73 611ms 7 days ago 709th dieggsy 867 97 28ms 8 Oct 2024 710th ovs-code 🇩🇪 867 133 42ms 8 Jul 2024 711th Andriamanitra 🇫🇮 866 54 40ms 21 Jul 2022 711th jared-hughes 866 54 39ms 12 Sep 2022 711th OhmNomNom 866 54 37ms 7 Oct 2022 711th olleicua 🇺🇸 866 54 41ms 21 Jan 2024 711th LostSyntax21 🇬🇧 866 54 52ms 12 Mar 2025 711th AbrahamJLR 🇻🇪 866 54 44ms 4 Jun 2025 711th vishal-mohanty 866 54 37ms 25 Aug 2025 718th GolfingSuccess 🇬🇷 866 57 819ms 29 Aug 2025 719th MeWhenI 🇻🇦 866 85 41ms 27 Jun 2022 719th Shanethegamer 🇺🇸 866 85 38ms 15 May 2023 First Prev 641–720 of 3,478 Next Last