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 ><> ALGOL 68 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 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 ><> ALGOL 68 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 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 713th Shengxuan-Zhang 878 66 278ms 40 hours ago 722nd frankgraziano 878 83 16ms 4 hours ago 722nd GrayJoKing 🇦🇺 878 83 15ms 50 mins ago 724th DialFrost 🇸🇬 878 86 40ms 24 Oct 2024 724th stefangimmillaro 878 86 39ms 14 Jan 2025 726th emgordon154 878 97 104ms 3 Dec 2025 727th c0d3-4-F00d 🇩🇪 877 61 12ms 6 May 2022 727th jackkav 877 61 12ms 26 Jun 2022 727th TechNolaByte 877 61 11ms 6 Jul 2022 727th Heathcorp 🇦🇺 877 61 11ms 17 Jul 2022 727th C0de5mith 🇺🇸 877 61 12ms 3 Aug 2022 727th sebipopa 🇷🇴 877 61 10ms 18 Aug 2022 727th moikaturns 🇬🇧 877 61 12ms 25 Sep 2022 727th FlorianCassayre 🇫🇷 877 61 11ms 27 Sep 2022 727th Mazn3k 877 61 11ms 1 Feb 2023 727th tvcv901 877 61 11ms 22 Mar 2023 727th unfinishedprogram 877 61 11ms 19 Jul 2023 727th snoozingnewt 🇨🇦 877 61 10ms 23 Sep 2023 727th funnyboy-roks 877 61 12ms 9 May 2024 727th bac0id 877 61 10ms 29 Jun 2024 727th madex 🇩🇪 877 61 12ms 9 Jul 2024 727th FortuiteMan 🇫🇷 877 61 11ms 10 Oct 2024 727th RobertHoeh 877 61 12ms 5 Apr 2025 727th LvLError 877 61 11ms 29 May 2025 727th miles-evan 877 61 13ms 5 Aug 2025 727th alexsave 877 61 10ms 13 Oct 2025 747th nwellnhof 🇩🇪 876 53 6ms 4 May 2022 747th GrayJoKing 🇦🇺 876 53 7ms 6 May 2022 749th c0d3-4-F00d 🇩🇪 876 89 368ms 5 May 2022 749th fkantelberg 876 89 388ms 15 Jul 2023 749th TRexOnGit 876 89 423ms 16 Feb 2024 752nd MeWhenI 🇻🇦 876 110 281ms 9 Feb 2023 752nd edsrzf 🇳🇿 876 110 292ms 28 Nov 2024 752nd targrik 876 110 271ms 30 Jun 2025 755th AlephSquirrel 875 80 12ms 20 Apr 2023 755th ashtraypettingzoo 🇺🇸 875 80 14ms 1 Apr 2024 757th inventshah 875 97 57ms 6 May 2022 757th roupiq 🇵🇱 875 97 55ms 22 Nov 2023 757th emgordon154 875 97 53ms 13 days ago 760th DialFrost 🇸🇬 874 69 88ms 15 Jul 2024 761st Irratix 🇳🇱 874 72 2ms 4 May 2022 761st m-tkach 🇺🇦 874 72 2ms 4 May 2022 761st jared-hughes 874 72 2ms 6 Jul 2022 761st michael-pruglo 🇺🇦 874 72 2ms 13 Jul 2022 761st Steffan153 🇫🇮 874 72 2ms 3 Jan 2023 761st MeWhenI 🇻🇦 874 72 2ms 7 May 2023 761st ListeriaM 874 72 2ms 22 Aug 2023 761st JohandeRuiter 🇳🇱 874 72 3ms 14 Sep 2024 761st larcherMTT 874 72 2ms 5 Oct 2024 761st snyderek 🇺🇸 874 72 2ms 19 Feb 2025 761st 5quiwyrm 874 72 2ms 29 Jun 2025 761st TeodorDyakov 🇧🇬 874 72 3ms 8 Jul 2025 761st xiaoyiming123 874 72 2ms 12 Jul 2025 774th Steffan153 🇫🇮 874 83 481ms 9 Apr 2023 775th ovs-code 🇩🇪 874 85 16ms 11 Dec 2023 776th DialFrost 🇸🇬 873 64 5ms 10 Jul 2024 777th ovs-code 🇩🇪 873 83 57ms 1 Jul 2024 778th Andriamanitra 🇫🇮 872 54 41ms 21 Jul 2022 778th jared-hughes 872 54 37ms 12 Sep 2022 778th OhmNomNom 872 54 37ms 7 Oct 2022 778th olleicua 🇺🇸 872 54 41ms 21 Jan 2024 778th LostSyntax21 🇬🇧 872 54 41ms 12 Mar 2025 778th AbrahamJLR 🇻🇪 872 54 40ms 4 Jun 2025 778th vishal-mohanty 872 54 40ms 25 Aug 2025 785th Shanethegamer 🇺🇸 872 85 38ms 15 May 2023 785th albanian-laundromat 872 85 40ms 25 Aug 2025 787th dieggsy 872 97 28ms 8 Oct 2024 788th ulucs 871 35 9ms 8 May 2022 788th bstrat 871 35 8ms 6 Jun 2024 788th wh3n3v3r 🇨🇿 871 35 8ms 18 Nov 2024 791st scpchicken 🇵🇼 871 45 332ms 4 May 2022 791st SirBogman 🇺🇸 871 45 230ms 5 May 2022 793rd TFeld00 🇩🇰 871 71 25ms 17 May 2022 793rd DialFrost 🇸🇬 871 71 25ms 15 Nov 2022 793rd StefanHabel 🇨🇦 871 71 19ms 29 Nov 2022 793rd nstearns96 🇬🇧 871 71 21ms 11 Jan 2023 793rd hallvabo 🇳🇴 871 71 19ms 7 Feb 2023 793rd anter69 🇭🇺 871 71 18ms 21 May 2024 793rd rucin93 🇵🇱 871 71 17ms 10 Jul 2024 793rd lelbal 871 71 20ms 26 Aug 2025 First Prev 721–800 of 3,592 Next Last