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 Continued Fractions 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 Gray Code Decoder Gray Code Encoder 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript 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 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 ArkScript 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 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 Continued Fractions 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 Gray Code Decoder Gray Code Encoder 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 213th 77Tigers 851 74 22ms 8 Jan 2026 213th netfri25 🇮🇱 851 74 31ms 31 Jan 2026 213th rotemkm 851 74 22ms 14 Feb 2026 213th RodAlc24 🇪🇸 851 74 21ms 26 Feb 2026 213th Sandw1ch123 851 74 20ms 19 days ago 213th LandonWeng 851 74 20ms 6 days ago 213th cuvam 851 74 21ms 12 hours ago 328th martinnorling 🇸🇪 840 75 23ms 5 May 2022 328th Trunksistor 🇫🇷 840 75 23ms 9 May 2022 328th bbakersmith 840 75 25ms 28 Jun 2022 328th bsoyka 🇺🇸 840 75 18ms 16 Jul 2022 328th P-Quentin 🇫🇷 840 75 20ms 3 Aug 2022 328th julienlamoureux78 840 75 20ms 12 Aug 2022 328th dzshn 840 75 26ms 16 Aug 2022 328th NerdyMcNerd42 840 75 21ms 20 Aug 2022 328th destofr 840 75 19ms 25 Aug 2022 328th vishwathg 840 75 53ms 10 Oct 2022 328th nkoppel 840 75 21ms 19 Oct 2022 328th AZ9tumas 840 75 20ms 23 Oct 2022 328th EthanGrant1 840 75 22ms 7 Nov 2022 328th Omega65536 🇩🇪 840 75 22ms 24 Nov 2022 328th b10011 🇫🇮 840 75 25ms 3 Jan 2023 328th 4ndyJ 🇬🇧 840 75 28ms 3 Jan 2023 328th randolchance 840 75 19ms 8 Jan 2023 328th LeeCamp 840 75 19ms 12 Jan 2023 328th hellwue 840 75 19ms 15 Feb 2023 328th nandanjp 840 75 20ms 29 Mar 2023 328th kaptsanovb 840 75 23ms 20 Apr 2023 328th galloj 🇨🇿 840 75 19ms 20 May 2023 328th jhu04 840 75 21ms 23 Jun 2023 328th HelloYuiYui 840 75 21ms 1 Nov 2023 328th tobyLovick 840 75 27ms 10 Nov 2023 328th VictorStenvers 🇳🇱 840 75 25ms 13 Nov 2023 328th RZ781 840 75 29ms 19 Nov 2023 328th mikehanus 840 75 25ms 21 Nov 2023 328th 1231234md5 🇨🇳 840 75 22ms 14 Dec 2023 328th Hebelub 840 75 22ms 6 Jan 2024 328th minhtrancccp 840 75 26ms 11 Jan 2024 328th 123mjb 840 75 26ms 25 Jan 2024 328th jbjd 840 75 22ms 25 Feb 2024 328th gabe-gallegos 840 75 20ms 2 May 2024 328th kejcao 🇨🇦 840 75 26ms 11 May 2024 328th f-tucker 840 75 24ms 24 May 2024 328th Florian-Mt 840 75 20ms 22 Jul 2024 328th codingisgreatbutiamnot 840 75 21ms 9 Aug 2024 328th Terobero 840 75 33ms 23 Aug 2024 328th abhishekg999 840 75 60ms 17 Sep 2024 328th RedzGoose 🇦🇺 840 75 30ms 7 Oct 2024 328th Clay-Goodling 840 75 26ms 8 Oct 2024 328th JunkIce 840 75 25ms 5 Mar 2025 328th jiji7879 840 75 25ms 20 Jun 2025 328th faragocsaba 840 75 23ms 22 Jun 2025 328th bknower 840 75 23ms 30 Jun 2025 328th clayboll99 840 75 23ms 14 Jul 2025 328th Nikinator2704 840 75 20ms 1 Nov 2025 328th mmoffitt 840 75 26ms 19 Nov 2025 328th AdrienHache 🇫🇷 840 75 22ms 20 Dec 2025 328th enigma 840 75 32ms 21 Dec 2025 328th jesuscbm 840 75 22ms 26 Feb 2026 328th ASampsonMu31 840 75 52ms 13 Mar 2026 381st guilhem-roy 🇫🇷 829 76 25ms 5 May 2022 381st NewDefectus 🇮🇱 829 76 22ms 6 May 2022 381st CuboidRaptor 🇨🇦 829 76 23ms 25 May 2022 381st TheSmilingTurtle 829 76 26ms 5 Jun 2022 381st Romain-1 🇫🇷 829 76 20ms 8 Jun 2022 381st jhpaques 🇫🇷 829 76 24ms 30 Jul 2022 381st chriscianfarani 829 76 23ms 10 Aug 2022 381st eshilo-draper 829 76 22ms 13 Sep 2022 381st suwat513 829 76 22ms 22 Sep 2022 381st Jaydosu 829 76 23ms 14 Nov 2022 381st tails618 829 76 28ms 2 Dec 2022 381st KevinLyvers 829 76 22ms 17 Dec 2022 381st nayakrujul 829 76 20ms 3 Jan 2023 381st CheeseCake628 🇳🇴 829 76 22ms 8 Jan 2023 381st CatsAreFluffy 829 76 29ms 18 Feb 2023 381st adamnielson42 🇺🇸 829 76 20ms 1 Mar 2023 381st Schreipfelerer 829 76 30ms 9 Apr 2023 381st hm5822 829 76 27ms 22 Apr 2023 381st celiendonze 🇨🇭 829 76 26ms 5 Jul 2023 381st brochmann 🇸🇪 829 76 22ms 13 Aug 2023 First Prev 321–400 of 852 Next Last
