Collatz in all languages in bytes. 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 Calendar 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 Multitap Input 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 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 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 ArkScript Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily 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 ArkScript Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily 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 Calendar 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 Multitap Input 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 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 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 Bytes Time Submitted 721st emgordon154 878 97 104ms 3 Dec 2025 722nd c0d3-4-F00d 🇩🇪 877 61 12ms 6 May 2022 722nd jackkav 877 61 11ms 26 Jun 2022 722nd TechNolaByte 877 61 11ms 6 Jul 2022 722nd Heathcorp 🇦🇺 877 61 11ms 17 Jul 2022 722nd C0de5mith 🇺🇸 877 61 14ms 3 Aug 2022 722nd sebipopa 🇷🇴 877 61 10ms 18 Aug 2022 722nd moikaturns 🇬🇧 877 61 11ms 25 Sep 2022 722nd FlorianCassayre 🇫🇷 877 61 12ms 27 Sep 2022 722nd Mazn3k 877 61 11ms 1 Feb 2023 722nd tvcv901 877 61 13ms 22 Mar 2023 722nd unfinishedprogram 877 61 11ms 19 Jul 2023 722nd snoozingnewt 🇨🇦 877 61 10ms 23 Sep 2023 722nd funnyboy-roks 877 61 10ms 9 May 2024 722nd bac0id 877 61 11ms 29 Jun 2024 722nd madex 🇩🇪 877 61 10ms 9 Jul 2024 722nd FortuiteMan 🇫🇷 877 61 10ms 10 Oct 2024 722nd RobertHoeh 877 61 11ms 5 Apr 2025 722nd LvLError 877 61 11ms 29 May 2025 722nd miles-evan 877 61 12ms 5 Aug 2025 722nd alexsave 877 61 10ms 13 Oct 2025 742nd nwellnhof 🇩🇪 876 53 6ms 4 May 2022 742nd GrayJoKing 🇦🇺 876 53 7ms 6 May 2022 744th c0d3-4-F00d 🇩🇪 876 89 368ms 5 May 2022 744th fkantelberg 876 89 407ms 15 Jul 2023 744th TRexOnGit 876 89 432ms 16 Feb 2024 747th MeWhenI 🇻🇦 876 110 281ms 9 Feb 2023 747th edsrzf 🇳🇿 876 110 292ms 28 Nov 2024 747th targrik 876 110 271ms 30 Jun 2025 750th AlephSquirrel 875 80 12ms 20 Apr 2023 750th ashtraypettingzoo 🇺🇸 875 80 15ms 1 Apr 2024 752nd inventshah 875 97 57ms 6 May 2022 752nd roupiq 🇵🇱 875 97 55ms 22 Nov 2023 752nd emgordon154 875 97 53ms 8 days ago 755th DialFrost 🇸🇬 874 69 88ms 15 Jul 2024 756th Irratix 🇳🇱 874 72 2ms 4 May 2022 756th m-tkach 🇺🇦 874 72 2ms 4 May 2022 756th jared-hughes 874 72 2ms 6 Jul 2022 756th michael-pruglo 🇺🇦 874 72 2ms 13 Jul 2022 756th Steffan153 🇫🇮 874 72 2ms 3 Jan 2023 756th MeWhenI 🇻🇦 874 72 3ms 7 May 2023 756th ListeriaM 874 72 2ms 22 Aug 2023 756th JohandeRuiter 🇳🇱 874 72 3ms 14 Sep 2024 756th larcherMTT 874 72 2ms 5 Oct 2024 756th snyderek 🇺🇸 874 72 3ms 19 Feb 2025 756th 5quiwyrm 874 72 2ms 29 Jun 2025 756th TeodorDyakov 🇧🇬 874 72 3ms 8 Jul 2025 756th xiaoyiming123 874 72 2ms 12 Jul 2025 769th Steffan153 🇫🇮 874 83 510ms 9 Apr 2023 770th ovs-code 🇩🇪 874 85 16ms 11 Dec 2023 771st DialFrost 🇸🇬 873 64 5ms 10 Jul 2024 772nd ovs-code 🇩🇪 873 83 54ms 1 Jul 2024 773rd Andriamanitra 🇫🇮 872 54 41ms 21 Jul 2022 773rd jared-hughes 872 54 37ms 12 Sep 2022 773rd OhmNomNom 872 54 37ms 7 Oct 2022 773rd olleicua 🇺🇸 872 54 41ms 21 Jan 2024 773rd LostSyntax21 🇬🇧 872 54 42ms 12 Mar 2025 773rd AbrahamJLR 🇻🇪 872 54 40ms 4 Jun 2025 773rd vishal-mohanty 872 54 40ms 25 Aug 2025 780th Shanethegamer 🇺🇸 872 85 38ms 15 May 2023 780th albanian-laundromat 872 85 40ms 25 Aug 2025 782nd dieggsy 872 97 28ms 8 Oct 2024 783rd ulucs 871 35 9ms 8 May 2022 783rd bstrat 871 35 9ms 6 Jun 2024 783rd wh3n3v3r 🇨🇿 871 35 8ms 18 Nov 2024 786th scpchicken 🇵🇼 871 45 332ms 4 May 2022 786th SirBogman 🇺🇸 871 45 230ms 5 May 2022 788th TFeld00 🇩🇰 871 71 25ms 17 May 2022 788th DialFrost 🇸🇬 871 71 32ms 15 Nov 2022 788th StefanHabel 🇨🇦 871 71 21ms 29 Nov 2022 788th nstearns96 🇬🇧 871 71 24ms 11 Jan 2023 788th hallvabo 🇳🇴 871 71 19ms 7 Feb 2023 788th anter69 🇭🇺 871 71 18ms 21 May 2024 788th rucin93 🇵🇱 871 71 17ms 10 Jul 2024 788th lelbal 871 71 20ms 26 Aug 2025 788th HETHAT 🇩🇿 871 71 25ms 23 Sep 2025 788th 09cf 871 71 19ms 18 Nov 2025 788th Languag3 871 71 25ms 5 Dec 2025 788th CommandLeo 🇮🇹 871 71 23ms 8 Jan 2026 788th Flekay 🇩🇪 871 71 17ms 3 days ago First Prev 721–800 of 3,578 Next Last