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 801st bartsowka2000 423 149 22ms 10 Jul 2023 802nd KapelMeister 420 150 14ms 5 Sep 2025 803rd Shegofa-Ahmadi 409 154 15ms 28 Apr 2025 804th arinhyther 406 155 18ms 24 Dec 2022 805th SebbeCaliban 401 157 18ms 11 Apr 2023 806th codefeld 364 173 20ms 5 Mar 2023 807th fl3ur1nestimable 354 178 16ms 24 Oct 2022 808th Laellekoenig 339 186 17ms 7 Nov 2025 809th Siyasia 333 189 17ms 22 Apr 2025 810th kalehika1234 326 193 14ms 24 Apr 2025 811th hannahherbig 325 194 15ms 30 Mar 2023 812th dahappy1989 307 205 17ms 5 Nov 2023 813th sahilshresthaa 306 206 15ms 4 May 2025 814th jalbertgordon 304 207 14ms 24 Oct 2023 815th AidanWalter 301 209 14ms 3 Jan 2025 816th sayloren 290 217 21ms 5 Mar 2023 816th AshayP123 290 217 18ms 1 May 2025 818th rubenguajardount 280 225 22ms 4 May 2025 819th amritm55 276 228 18ms 1 Apr 2025 820th clarkatunt19 275 229 20ms 3 May 2025 821st jac1107 274 230 14ms 4 May 2025 821st rcs0252 274 230 15ms 4 May 2025 823rd apurbapokharel 269 234 20ms 3 Apr 2025 824th wlopez44 260 242 14ms 29 Apr 2025 824th sakshiPatel2602 260 242 14ms 3 May 2025 826th Zok030 259 243 15ms 1 Apr 2025 826th Josemnz 259 243 15ms 28 Apr 2025 828th tophy6 256 246 16ms 1 Apr 2025 828th LyndaS317 256 246 14ms 14 Apr 2025 830th letdank 255 247 16ms 1 Apr 2025 830th AdamGonzo1254 255 247 15ms 3 May 2025 832nd shawncrabtree 250 252 17ms 5 Jul 2025 833rd punkroczombie 248 254 17ms 4 May 2025 834th Abulsamad 221 285 15ms 5 May 2025 835th aidnrox 208 303 14ms 2 May 2025 836th OffSecVik 207 304 17ms 25 Feb 2023 837th Hailee100 201 314 16ms 1 Apr 2025 838th lightediand 🇬🇧 197 319 16ms 14 Dec 2022 839th chaamsak 196 322 19ms 1 May 2025 840th joshuamkite 192 328 16ms 15 Aug 2023 841st 27carig 191 330 38ms 2 May 2025 842nd steven-purcell 170 370 23ms 15 Jan 2024 843rd lightgeb 164 384 18ms 27 Oct 2023 843rd Zhenyu-Bo 164 384 15ms 1 Aug 2025 845th Samtheman773 162 390 19ms 22 Apr 2025 846th jejuan05 140 450 18ms 1 Apr 2025 847th DiyaKumariGupta 113 560 14ms 30 Apr 2025 848th chasedillard 100 629 14ms 30 Apr 2025 849th JKfromHMS 19 3,238 10ms 20 May 2024 849th RJFuller 19 3,238 12ms 3 Apr 2025 849th averagepythondev 19 3,238 11ms 2 Jan 2026 852nd KatieLG-Transpiler 🇬🇧 15 4,233 11ms 23 Jun 2022 First Prev 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