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 719th OhmNomNom 866 54 45ms 7 Oct 2022 719th olleicua 🇺🇸 866 54 53ms 21 Jan 2024 719th LostSyntax21 🇬🇧 866 54 63ms 12 Mar 2025 719th AbrahamJLR 🇻🇪 866 54 58ms 4 Jun 2025 719th vishal-mohanty 866 54 37ms 25 Aug 2025 726th GolfingSuccess 🇬🇷 866 57 819ms 29 Aug 2025 727th MeWhenI 🇻🇦 866 85 41ms 27 Jun 2022 727th Shanethegamer 🇺🇸 866 85 38ms 15 May 2023 727th albanian-laundromat 866 85 40ms 25 Aug 2025 730th 123mjb 866 96 356ms 20 Nov 2025 730th noescareno 866 96 406ms 26 days ago 732nd DialFrost 🇸🇬 864 64 5ms 10 Jul 2024 733rd emplv 🇱🇻 864 110 296ms 5 May 2022 733rd Shanethegamer 🇺🇸 864 110 261ms 21 Nov 2023 733rd edsrzf 🇳🇿 864 110 258ms 28 Nov 2024 733rd targrik 864 110 267ms 30 Jun 2025 737th mtirado1 863 75 7ms 13 Aug 2022 738th TylerBloom 863 96 115ms 22 Mar 2024 739th Shanethegamer 🇺🇸 863 97 100ms 15 Apr 2025 739th GolfingSuccess 🇬🇷 863 97 111ms 20 days ago 739th DialFrost 🇸🇬 863 97 94ms 16 days ago 742nd shellbertt 🇨🇦 863 98 66ms 9 May 2022 742nd iakolzin 863 98 85ms 26 May 2022 742nd Betuaredead 863 98 78ms 5 Jan 2023 742nd oceko 863 98 73ms 19 Feb 2024 742nd dokutan 863 98 81ms 17 Mar 2024 742nd cuzdav 863 98 62ms 4 May 2025 742nd timhaj 🇸🇮 863 98 82ms 12 Sep 2025 742nd Yax42 🇫🇷 863 98 75ms 4 Oct 2025 750th Steffan153 🇫🇮 862 82 1,287ms 23 Feb 2023 751st deadp4nda 🇩🇪 862 90 372ms 26 Apr 2024 751st 123mjb 862 90 352ms 23 Jun 2025 751st michelebastione 🇮🇹 862 90 384ms 24 Aug 2025 751st razvandmtr 🇷🇴 862 90 385ms 6 Nov 2025 755th steffan-polygolf 861 73 87ms 23 Feb 2023 755th MWI-polygolf 861 73 83ms 6 Dec 2023 755th HumanoidCPU 861 73 81ms 7 May 2024 758th Steffan153 🇫🇮 861 78 80ms 4 Feb 2023 759th GrayJoKing 🇦🇺 860 56 411ms 15 Jan 2024 759th AlephSquirrel 860 56 426ms 21 Jan 2024 761st Setvizan 860 62 10ms 12 Jan 2023 761st GreenBeansAgainstVeganism 860 62 10ms 13 Jan 2023 761st arctouch-cristiannevianna 860 62 10ms 3 Apr 2023 761st Corxldyphik 860 62 10ms 11 Apr 2023 761st Blockyheadman 860 62 10ms 1 Nov 2023 761st ollyspooner 860 62 10ms 22 Nov 2023 761st itserasmus 860 62 10ms 25 Jan 2024 761st Jacob385 860 62 10ms 13 Mar 2024 761st junkondo-jp 860 62 11ms 30 Jun 2024 761st ShiraJoseph 🇺🇸 860 62 9ms 1 Mar 2025 761st tomh1012 860 62 9ms 15 days ago 772nd yzhs 🇩🇪 860 65 19ms 16 Jun 2022 772nd rollershutter 860 65 20ms 9 Sep 2022 772nd bac0id 860 65 20ms 26 Sep 2023 772nd robin-scragg 860 65 23ms 8 Jun 2025 772nd RaBa21 🇭🇺 860 65 29ms 11 Jul 2025 772nd TransformLikeATensor 860 65 20ms 17 Oct 2025 778th Andriamanitra 🇫🇮 860 67 144ms 26 Apr 2023 779th MeWhenI 🇻🇦 859 81 8ms 23 May 2023 780th MeWhenI 🇻🇦 859 145 526ms 28 Mar 2025 781st ulucs 858 35 9ms 8 May 2022 781st bstrat 858 35 9ms 6 Jun 2024 781st wh3n3v3r 🇨🇿 858 35 8ms 18 Nov 2024 784th JRaspass 🇬🇧 858 41 358ms 4 May 2022 784th SirBogman 🇺🇸 858 41 300ms 4 May 2022 784th Natanaelel 🇸🇪 858 41 365ms 4 May 2022 787th 5quiwyrm 858 52 300ms 4 Sep 2022 787th MeWhenI 🇻🇦 858 52 280ms 28 Jan 2023 787th Feniske 🇫🇷 858 52 280ms 7 Nov 2023 787th dcgjb 858 52 297ms 29 Jan 2024 787th JPRuskin 🇬🇧 858 52 313ms 7 Apr 2025 787th IISResetMe 858 52 267ms 7 Apr 2025 787th Ripick 858 52 266ms 1 Jun 2025 794th Yewzir 🇧🇪 858 160 2,399ms 14 Nov 2025 795th jared-hughes 857 72 2ms 6 Jul 2022 795th Steffan153 🇫🇮 857 72 2ms 3 Jan 2023 795th MeWhenI 🇻🇦 857 72 3ms 7 May 2023 795th ListeriaM 857 72 2ms 22 Aug 2023 795th larcherMTT 857 72 2ms 5 Oct 2024 795th snyderek 🇺🇸 857 72 3ms 19 Feb 2025 First Prev 721–800 of 3,502 Next Last