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 144th KasperKivimaeki 🇫🇮 934 89 335ms 22 days ago 162nd primo-ppcg 🇹🇭 933 58 5ms 13 Nov 2022 162nd clockworknazo 933 58 6ms 15 Nov 2022 162nd Lydxn 🇨🇦 933 58 6ms 7 Feb 2023 162nd xsot 🇸🇬 933 58 6ms 28 Jun 2024 162nd Salutations45 933 58 6ms 18 Dec 2024 162nd canissimia 🇦🇶 933 58 6ms 11 days ago 168th canissimia 🇦🇶 931 51 927ms 6 May 2022 168th Lydxn 🇨🇦 931 51 1,001ms 6 May 2022 168th primo-ppcg 🇹🇭 931 51 930ms 6 May 2022 168th pardouin 🇫🇷 931 51 953ms 12 Apr 2025 172nd ovs-code 🇩🇪 931 60 20ms 4 May 2022 172nd m-tkach 🇺🇦 931 60 17ms 4 May 2022 172nd btnlq 931 60 23ms 5 May 2022 172nd orthoplex 🇨🇽 931 60 23ms 9 Oct 2022 172nd FlorianCassayre 🇫🇷 931 60 19ms 7 Nov 2022 172nd SirBogman 🇺🇸 931 60 19ms 20 Nov 2022 172nd QuincyNash 🇺🇸 931 60 18ms 1 Dec 2022 172nd Steffan153 🇫🇮 931 60 19ms 19 Dec 2022 172nd SirFireball3521 931 60 16ms 26 Jan 2023 172nd Shanethegamer 🇺🇸 931 60 19ms 25 May 2023 172nd CornerMercury 🇬🇧 931 60 20ms 19 Jun 2023 172nd ndren 931 60 20ms 2 Aug 2023 172nd kg583 🇺🇸 931 60 54ms 14 Aug 2023 172nd Just4FunCoder 931 60 19ms 17 Feb 2024 172nd HumanoidCPU 931 60 23ms 6 May 2024 172nd sean-niemann 🇺🇸 931 60 22ms 10 Jul 2024 172nd pardouin 🇫🇷 931 60 18ms 11 Jul 2024 172nd dokutan 931 60 19ms 15 Aug 2024 172nd jatloe 931 60 19ms 26 Aug 2024 172nd emgordon154 931 60 18ms 6 Sep 2024 172nd starfihs 931 60 19ms 12 Oct 2024 172nd CaedenHarper 🇨🇦 931 60 20ms 3 Nov 2024 172nd 5quiwyrm 931 60 18ms 12 Nov 2024 172nd plcc0 931 60 16ms 26 Mar 2025 172nd yujh-yujh 🇬🇸 931 60 17ms 28 Mar 2025 172nd albanian-laundromat 931 60 18ms 12 Apr 2025 172nd Mukundan314 931 60 20ms 17 Apr 2025 172nd fuzzylojik-golf 🇺🇸 931 60 19ms 1 Sep 2025 172nd luuumine 🇫🇷 931 60 21ms 3 Nov 2025 172nd Babafaba 931 60 18ms 7 Nov 2025 172nd hellopir2 931 60 18ms 24 Nov 2025 203rd grey0ut 929 48 2,043ms 8 Apr 2025 204th m-tkach 🇺🇦 929 91 64ms 5 May 2022 204th 09cf 929 91 81ms 4 Oct 2023 206th emplv 🇱🇻 927 60 12ms 5 May 2022 206th GrayJoKing 🇦🇺 927 60 11ms 6 May 2022 206th targrik 927 60 13ms 24 Dec 2024 206th xsot 🇸🇬 927 60 12ms 1 May 2025 210th Lydxn 🇨🇦 926 38 1,749ms 4 May 2022 210th GrayJoKing 🇦🇺 926 38 396ms 5 May 2022 210th Steffan153 🇫🇮 926 38 364ms 16 Dec 2022 210th ovs-code 🇩🇪 926 38 423ms 30 Dec 2023 214th GolfingSuccess 🇬🇷 926 49 38ms 12 Aug 2024 214th Shanethegamer 🇺🇸 926 49 39ms 12 Aug 2024 214th Steffan153 🇫🇮 926 49 39ms 12 Aug 2024 214th MeWhenI 🇻🇦 926 49 37ms 13 Aug 2024 214th DialFrost 🇸🇬 926 49 39ms 13 Aug 2024 214th GrayJoKing 🇦🇺 926 49 41ms 15 Aug 2024 214th btnlq 926 49 39ms 16 Aug 2024 214th emgordon154 926 49 41ms 19 Aug 2024 214th ovs-code 🇩🇪 926 49 39ms 19 Aug 2024 214th mousetail 🇳🇱 926 49 42ms 13 Sep 2024 214th lynn 926 49 40ms 20 Dec 2024 214th weeble 926 49 40ms 20 Dec 2024 214th sean-niemann 🇺🇸 926 49 40ms 11 Jan 2025 227th ovs-code 🇩🇪 926 52 418ms 16 Jan 2024 227th kg583 🇺🇸 926 52 450ms 24 Jan 2024 227th Shanethegamer 🇺🇸 926 52 370ms 24 Mar 2024 227th pardouin 🇫🇷 926 52 397ms 11 Jul 2024 227th Steffan153 🇫🇮 926 52 442ms 17 Aug 2024 227th sean-niemann 🇺🇸 926 52 452ms 24 Jan 2025 233rd MeWhenI 🇻🇦 925 68 91ms 23 Feb 2023 233rd JayXon 🇺🇸 925 68 88ms 4 Mar 2025 235th Lydxn 🇨🇦 924 70 106ms 17 Oct 2022 235th JayXon 🇺🇸 924 70 99ms 17 Oct 2022 237th roavin 924 84 337ms 23 Jun 2022 237th tkr-sh 🇰🇵 924 84 318ms 20 Aug 2022 237th Nickmiste 924 84 326ms 9 Nov 2022 237th postie77 924 84 323ms 19 May 2023 First Prev 161–240 of 3,472 Next Last