The Calendar hole will go live in approximately 13 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 146th snoozingnewt 🇨🇦 934 89 394ms 25 days ago 146th ScottHamper 934 89 436ms 18 days ago 146th KasperKivimaeki 🇫🇮 934 89 335ms 18 days ago 164th primo-ppcg 🇹🇭 933 58 5ms 13 Nov 2022 164th clockworknazo 933 58 6ms 15 Nov 2022 164th Lydxn 🇨🇦 933 58 6ms 7 Feb 2023 164th xsot 🇸🇬 933 58 6ms 28 Jun 2024 164th Salutations45 933 58 6ms 18 Dec 2024 164th canissimia 🇦🇶 933 58 6ms 6 days ago 170th canissimia 🇦🇶 931 51 927ms 6 May 2022 170th Lydxn 🇨🇦 931 51 1,001ms 6 May 2022 170th primo-ppcg 🇹🇭 931 51 930ms 6 May 2022 170th pardouin 🇫🇷 931 51 953ms 12 Apr 2025 174th ovs-code 🇩🇪 931 60 20ms 4 May 2022 174th m-tkach 🇺🇦 931 60 17ms 4 May 2022 174th btnlq 931 60 23ms 5 May 2022 174th orthoplex 🇨🇽 931 60 23ms 9 Oct 2022 174th FlorianCassayre 🇫🇷 931 60 19ms 7 Nov 2022 174th SirBogman 🇺🇸 931 60 19ms 20 Nov 2022 174th QuincyNash 🇺🇸 931 60 18ms 1 Dec 2022 174th Steffan153 🇫🇮 931 60 19ms 19 Dec 2022 174th SirFireball3521 931 60 16ms 26 Jan 2023 174th Shanethegamer 🇺🇸 931 60 19ms 25 May 2023 174th CornerMercury 🇬🇧 931 60 20ms 19 Jun 2023 174th ndren 931 60 20ms 2 Aug 2023 174th kg583 🇺🇸 931 60 54ms 14 Aug 2023 174th Just4FunCoder 931 60 19ms 17 Feb 2024 174th HumanoidCPU 931 60 23ms 6 May 2024 174th sean-niemann 🇺🇸 931 60 22ms 10 Jul 2024 174th pardouin 🇫🇷 931 60 18ms 11 Jul 2024 174th dokutan 931 60 19ms 15 Aug 2024 174th jatloe 931 60 19ms 26 Aug 2024 174th emgordon154 931 60 18ms 6 Sep 2024 174th starfihs 931 60 19ms 12 Oct 2024 174th CaedenHarper 🇨🇦 931 60 20ms 3 Nov 2024 174th 5quiwyrm 931 60 18ms 12 Nov 2024 174th plcc0 931 60 16ms 26 Mar 2025 174th yujh-yujh 🇬🇸 931 60 17ms 28 Mar 2025 174th albanian-laundromat 931 60 18ms 12 Apr 2025 174th Mukundan314 931 60 20ms 17 Apr 2025 174th fuzzylojik-golf 🇺🇸 931 60 19ms 1 Sep 2025 174th luuumine 🇫🇷 931 60 21ms 3 Nov 2025 174th Babafaba 931 60 18ms 7 Nov 2025 174th hellopir2 931 60 18ms 24 days ago 205th grey0ut 929 48 2,043ms 8 Apr 2025 206th m-tkach 🇺🇦 929 91 64ms 5 May 2022 206th 09cf 929 91 81ms 4 Oct 2023 208th emplv 🇱🇻 927 60 9ms 5 May 2022 208th GrayJoKing 🇦🇺 927 60 10ms 6 May 2022 208th targrik 927 60 10ms 24 Dec 2024 208th xsot 🇸🇬 927 60 9ms 1 May 2025 212th Lydxn 🇨🇦 926 38 2,884ms 4 May 2022 212th GrayJoKing 🇦🇺 926 38 366ms 5 May 2022 212th Steffan153 🇫🇮 926 38 368ms 16 Dec 2022 212th ovs-code 🇩🇪 926 38 379ms 30 Dec 2023 216th GolfingSuccess 🇬🇷 926 49 38ms 12 Aug 2024 216th Shanethegamer 🇺🇸 926 49 39ms 12 Aug 2024 216th Steffan153 🇫🇮 926 49 39ms 12 Aug 2024 216th MeWhenI 🇻🇦 926 49 37ms 13 Aug 2024 216th DialFrost 🇸🇬 926 49 39ms 13 Aug 2024 216th GrayJoKing 🇦🇺 926 49 41ms 15 Aug 2024 216th btnlq 926 49 39ms 16 Aug 2024 216th emgordon154 926 49 41ms 19 Aug 2024 216th ovs-code 🇩🇪 926 49 39ms 19 Aug 2024 216th mousetail 🇳🇱 926 49 42ms 13 Sep 2024 216th lynn 926 49 40ms 20 Dec 2024 216th weeble 926 49 40ms 20 Dec 2024 216th sean-niemann 🇺🇸 926 49 40ms 11 Jan 2025 229th ovs-code 🇩🇪 926 52 418ms 16 Jan 2024 229th kg583 🇺🇸 926 52 450ms 24 Jan 2024 229th Shanethegamer 🇺🇸 926 52 370ms 24 Mar 2024 229th pardouin 🇫🇷 926 52 397ms 11 Jul 2024 229th Steffan153 🇫🇮 926 52 442ms 17 Aug 2024 229th sean-niemann 🇺🇸 926 52 452ms 24 Jan 2025 235th MeWhenI 🇻🇦 925 68 91ms 23 Feb 2023 235th JayXon 🇺🇸 925 68 88ms 4 Mar 2025 237th GrayJoKing 🇦🇺 925 70 3ms 13 Jul 2024 237th FlyingPenguin223 925 70 4ms 4 Oct 2024 237th jipsong 🇩🇪 925 70 4ms 5 Apr 2025 240th Lydxn 🇨🇦 924 70 106ms 17 Oct 2022 First Prev 161–240 of 3,502 Next Last