Collatz in Python 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 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 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 ArkScript 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 ArkScript 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 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 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 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 Bytes Time Submitted 366th DrakeSeteraO 829 76 52ms 24 Oct 2025 366th yoikolover 829 76 23ms 11 Dec 2025 403rd cooljoseph1 818 77 23ms 6 May 2022 403rd krcs 🇵🇱 818 77 21ms 11 May 2022 403rd kenballus 818 77 22ms 13 Jul 2022 403rd 104210 818 77 22ms 29 Jul 2022 403rd andre-de-lorde 818 77 21ms 1 Sep 2022 403rd zstephe 818 77 24ms 2 Dec 2022 403rd badboj40 818 77 23ms 27 Dec 2022 403rd henrytranter 818 77 27ms 11 Jan 2023 403rd DragonaireM 818 77 23ms 6 Feb 2023 403rd steffan-polygolf 818 77 19ms 19 Feb 2023 403rd kellantech 818 77 19ms 21 May 2023 403rd Ty-Cyr 818 77 18ms 14 Jul 2023 403rd camieac 🇬🇧 818 77 21ms 14 Jul 2023 403rd nathsou 🇫🇷 818 77 21ms 2 Sep 2023 403rd MisterrLuck 818 77 22ms 7 Sep 2023 403rd alexjurkiewicz 🇦🇺 818 77 19ms 7 Nov 2023 403rd askipio 818 77 23ms 22 Nov 2023 403rd trinityy-7 818 77 23ms 17 Dec 2023 403rd zwxzwxzwx21 818 77 23ms 30 Jan 2024 403rd PyryL 🇫🇮 818 77 20ms 23 Aug 2024 403rd CyberTapir 818 77 23ms 27 Aug 2024 403rd junten1 818 77 26ms 20 Oct 2024 403rd croc54 818 77 23ms 24 Dec 2024 403rd za3k 818 77 23ms 3 Jun 2025 403rd robin-scragg 818 77 18ms 17 Aug 2025 403rd j-zhang43 818 77 19ms 17 Nov 2025 429th AGoyet 808 78 22ms 29 Jul 2022 429th RYNO8 808 78 21ms 16 Aug 2022 429th TheCod-r 🇦🇶 808 78 25ms 28 Sep 2022 429th Marthe-CC 808 78 23ms 9 Oct 2022 429th Wildst 808 78 20ms 2 Nov 2022 429th nmgetahun 808 78 22ms 4 Dec 2022 429th Techdude01 808 78 26ms 13 Dec 2022 429th tvcv901 808 78 23ms 22 Mar 2023 429th oceko 808 78 19ms 24 Mar 2023 429th yoyoyonono 808 78 25ms 15 May 2023 429th Nic0M 808 78 18ms 13 Aug 2023 429th ssbhatt4321 808 78 23ms 14 Oct 2023 429th wyarde 808 78 19ms 7 Nov 2023 429th ItsEthanXYZ 808 78 19ms 24 Dec 2023 429th adamreidsmith 808 78 25ms 16 Feb 2024 429th Jacob385 808 78 59ms 5 Mar 2024 429th DGipe 808 78 22ms 13 May 2024 429th cyxv 808 78 24ms 2 Aug 2024 429th gallium-gonzollium 808 78 25ms 26 Aug 2024 429th Europe2048 808 78 19ms 24 Nov 2024 429th GeneralFabian 808 78 25ms 14 Dec 2024 450th kevdah 797 79 24ms 27 May 2022 450th jacklynnepenick 797 79 17ms 22 Jun 2022 450th james-downey 797 79 25ms 9 Jul 2022 450th andre-lameirinhas 🇵🇹 797 79 22ms 26 Jul 2022 450th hamsterskywalker 797 79 19ms 7 Sep 2022 450th Pena86 797 79 25ms 14 Sep 2022 450th hymanimy 797 79 26ms 24 Nov 2022 450th Demonarchet 797 79 19ms 18 Apr 2023 450th dtaylor0 797 79 20ms 23 May 2023 450th bac0id 797 79 19ms 26 Sep 2023 450th neonchickens 797 79 25ms 6 Oct 2023 450th MWI-polygolf 797 79 19ms 6 Dec 2023 450th eddvrs 797 79 22ms 22 Dec 2023 450th tknight00 797 79 26ms 7 Mar 2024 450th thienudomsrirungruang 797 79 44ms 3 May 2024 450th IsaacAlexBarden 797 79 23ms 6 Feb 2025 450th taesungh 797 79 24ms 7 Jun 2025 450th benvreeves 797 79 20ms 25 Jul 2025 450th saturzay 797 79 25ms 19 Aug 2025 450th TransformLikeATensor 797 79 20ms 16 Oct 2025 450th tomh1012 797 79 23ms 3 Dec 2025 471st j-Ewan 788 80 20ms 13 May 2022 471st osmith93 788 80 32ms 14 Jun 2022 471st hjcafaroUC 788 80 25ms 21 Jun 2022 471st dankleeman 788 80 20ms 8 Aug 2022 471st dillon-duncando 788 80 24ms 4 Oct 2022 471st DrPiranoid 788 80 22ms 11 Nov 2022 471st mdnestor 788 80 23ms 23 Dec 2022 471st Edjyzod 788 80 16ms 7 Mar 2023 471st henry-von-wichert 788 80 24ms 31 Mar 2023 471st Hortaros 788 80 22ms 16 Apr 2023 First Prev 401–480 of 816 Next Last