The Calendar hole will go live in approximately 8 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 81st Lydxn 🇨🇦 944 51 786ms 17 Jan 2024 82nd ovs-code 🇩🇪 944 61 248ms 5 Aug 2024 83rd JayXon 🇺🇸 944 88 540ms 24 Sep 2025 83rd Lydxn 🇨🇦 944 88 340ms 10 days ago 85th Lydxn 🇨🇦 943 59 11ms 6 May 2022 86th JayXon 🇺🇸 941 88 127ms 17 Oct 2022 86th acotis 941 88 119ms 9 Jun 2025 86th kumavale 941 88 136ms 7 Oct 2025 89th 2bular 939 32 27ms 17 Oct 2024 90th primo-ppcg 🇹🇭 938 49 6ms 5 May 2022 90th Lydxn 🇨🇦 938 49 6ms 8 May 2022 92nd saito-ta 🇯🇵 935 49 85ms 13 May 2022 92nd Lydxn 🇨🇦 935 49 96ms 28 May 2022 94th canissimia 🇦🇶 935 50 49ms 5 May 2022 94th ovs-code 🇩🇪 935 50 296ms 7 May 2022 94th sisyphus-ppcg 🇦🇺 935 50 37ms 20 Feb 2023 94th Steffan153 🇫🇮 935 50 56ms 20 Jul 2024 94th sean-niemann 🇺🇸 935 50 42ms 9 Jun 2025 94th pardouin 🇫🇷 935 50 42ms 22 Aug 2025 100th inventshah 935 57 10ms 4 May 2022 100th itsh01 935 57 10ms 17 May 2022 100th Natanaelel 🇸🇪 935 57 10ms 16 Jun 2022 100th Attero 🇸🇪 935 57 10ms 3 Aug 2022 100th SirFireball3521 935 57 10ms 26 Jan 2023 100th Kacarott 🇦🇺 935 57 10ms 24 Mar 2023 100th nathanadams 🇳🇿 935 57 12ms 24 Apr 2023 100th hacker112 🇸🇪 935 57 10ms 20 Jun 2024 100th thisishowmymindworks 🇳🇴 935 57 11ms 28 Jun 2024 100th Salutations45 935 57 10ms 18 Nov 2024 100th daniel-cardone 935 57 10ms 3 Jul 2025 100th CaedenHarper 🇨🇦 935 57 11ms 28 Sep 2025 100th BrunoVisnadi 🇧🇷 935 57 10ms 21 Oct 2025 100th Laellekoenig 935 57 10ms 22 Oct 2025 100th JOrE20 🇺🇸 935 57 10ms 5 Nov 2025 100th Lv0Sys 🇵🇱 935 57 14ms 15 days ago 116th Irratix 🇳🇱 935 83 351ms 4 May 2022 116th nwellnhof 🇩🇪 935 83 347ms 4 May 2022 116th ScottHamper 935 83 338ms 5 May 2022 116th Romain-1 🇫🇷 935 83 331ms 1 Jun 2022 116th Gaddy 🇫🇷 935 83 365ms 1 Jun 2022 116th 5quiwyrm 935 83 372ms 4 Sep 2022 116th Betuaredead 935 83 357ms 5 Jan 2023 116th Yewzir 🇧🇪 935 83 340ms 12 Feb 2023 116th btnlq 935 83 340ms 9 Mar 2023 116th Adix-null 🇱🇹 935 83 372ms 17 May 2023 116th Matgc04 935 83 347ms 19 May 2023 116th AdrienHache 🇫🇷 935 83 379ms 8 Jun 2023 116th gblikas 935 83 448ms 23 Jul 2023 116th KrausRaus 🇺🇸 935 83 353ms 31 Jul 2023 116th namelessiw 935 83 374ms 9 Apr 2025 116th dokutan 935 83 362ms 9 Apr 2025 116th m-tkach 🇺🇦 935 83 383ms 10 Apr 2025 116th DialFrost 🇸🇬 935 83 386ms 10 Apr 2025 116th Pecanolith 935 83 383ms 19 Apr 2025 116th Tyrant7 935 83 393ms 19 Apr 2025 116th Yax42 🇫🇷 935 83 381ms 19 Apr 2025 116th MeWhenI 🇻🇦 935 83 344ms 19 Jun 2025 116th sean-niemann 🇺🇸 935 83 346ms 20 Jun 2025 116th stefangimmillaro 935 83 389ms 20 Jun 2025 116th tomh1012 935 83 451ms 28 Aug 2025 116th fuzzylojik-golf 🇺🇸 935 83 363ms 8 Sep 2025 116th CaedenHarper 🇨🇦 935 83 357ms 17 Oct 2025 116th Flix7dev 🇧🇪 935 83 384ms 21 Oct 2025 144th DialFrost 🇸🇬 934 89 402ms 24 Sep 2025 144th ovs-code 🇩🇪 934 89 448ms 24 Sep 2025 144th dokutan 934 89 417ms 24 Sep 2025 144th sean-niemann 🇺🇸 934 89 456ms 24 Sep 2025 144th Shanethegamer 🇺🇸 934 89 438ms 25 Sep 2025 144th nwellnhof 🇩🇪 934 89 429ms 25 Sep 2025 144th m-tkach 🇺🇦 934 89 415ms 25 Sep 2025 144th namelessiw 934 89 456ms 2 Oct 2025 144th Yewzir 🇧🇪 934 89 695ms 2 Oct 2025 144th Yax42 🇫🇷 934 89 422ms 4 Oct 2025 144th stefangimmillaro 934 89 428ms 6 Oct 2025 144th CaedenHarper 🇨🇦 934 89 433ms 9 Oct 2025 144th Jacob385 934 89 452ms 27 Oct 2025 144th MeWhenI 🇻🇦 934 89 416ms 7 Nov 2025 144th ethanlally 934 89 433ms 10 Nov 2025 144th snoozingnewt 🇨🇦 934 89 394ms 23 Nov 2025 144th ScottHamper 934 89 436ms 22 days ago First Prev 81–160 of 3,472 Next Last