Collatz in all languages in bytes. Cheevos Holes Recent Holes Langs Medals Misc 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 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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir 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 Arturo Befunge BQN CJam CoffeeScript Egel Erlang 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 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 Arturo Befunge BQN CJam CoffeeScript Egel Erlang 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 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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 360th duckyluuk 🇳🇱 926 72 21ms 13 Jun 2024 360th tobeannouncd 926 72 22ms 25 Apr 2025 360th YAJUE114514 926 72 17ms 15 Aug 2025 360th blaztoma 🇱🇹 926 72 39ms 26 Sep 2025 380th JayXon 🇺🇸 926 105 296ms 4 Oct 2025 380th KasperKivimaeki 🇫🇮 926 105 283ms 4 Oct 2025 382nd ovs-code 🇩🇪 925 67 92ms 13 Dec 2022 382nd Steffan153 🇫🇮 925 67 99ms 18 Dec 2022 382nd Lydxn 🇨🇦 925 67 105ms 4 Feb 2023 382nd sean-niemann 🇺🇸 925 67 107ms 7 Mar 2025 386th Bubbler-4 923 33 2,543ms 6 May 2022 386th rak1507 🇬🇧 923 33 111ms 8 May 2022 386th ngn 🇧🇬 923 33 26ms 11 May 2022 386th zacjl 923 33 32ms 3 Jun 2025 386th GrayJoKing 🇦🇺 923 33 15ms 4 Jun 2025 391st edsrzf 🇳🇿 923 54 1,330ms 13 Sep 2025 391st CaedenHarper 🇨🇦 923 54 1,218ms 27 Sep 2025 391st sean-niemann 🇺🇸 923 54 1,376ms 27 Sep 2025 394th btnlq 923 59 8ms 6 Nov 2022 395th Lydxn 🇨🇦 923 90 124ms 6 May 2022 396th nwellnhof 🇩🇪 922 51 50ms 4 May 2022 396th primo-ppcg 🇹🇭 922 51 43ms 6 May 2022 396th janlelis 922 51 39ms 10 May 2022 396th Natanaelel 🇸🇪 922 51 39ms 2 Jun 2022 400th uiamn 922 58 11ms 6 Sep 2022 400th 5quiwyrm 922 58 12ms 29 Sep 2022 400th alasdair-greenland 922 58 10ms 13 Jan 2023 400th kirjavascript 922 58 11ms 4 Aug 2025 400th Posandu 922 58 11ms 26 Aug 2025 400th mrxz 🇳🇱 922 58 11ms 3 Sep 2025 406th Herbert00709 🇵🇱 922 92 67ms 17 Nov 2023 406th 4QT0R 922 92 67ms 23 Nov 2023 406th ovs-code 🇩🇪 922 92 64ms 3 Jun 2024 409th MichalMarsalek 🇨🇿 921 71 122ms 5 May 2022 409th Lydxn 🇨🇦 921 71 126ms 7 May 2022 409th GrayJoKing 🇦🇺 921 71 129ms 8 May 2022 409th JayXon 🇺🇸 921 71 137ms 8 May 2022 409th Steffan153 🇫🇮 921 71 120ms 9 Mar 2023 409th Shanethegamer 🇺🇸 921 71 128ms 15 May 2023 409th MeWhenI 🇻🇦 921 71 121ms 8 Aug 2023 409th sean-niemann 🇺🇸 921 71 126ms 9 Jan 2025 417th Steffan153 🇫🇮 921 76 12ms 15 May 2023 417th primo-ppcg 🇹🇭 921 76 23ms 15 May 2023 417th Lydxn 🇨🇦 921 76 10ms 22 May 2023 417th GrayJoKing 🇦🇺 921 76 12ms 24 Aug 2023 421st xnor-gate 919 63 194ms 20 Jan 2025 422nd Lydxn 🇨🇦 918 70 96ms 7 May 2022 422nd JayXon 🇺🇸 918 70 96ms 7 May 2022 424th pardouin 🇫🇷 918 72 3,105ms 21 May 2025 425th primo-ppcg 🇹🇭 917 61 6ms 6 May 2022 425th sisyphus-ppcg 🇦🇺 917 61 10ms 14 Jul 2022 427th Steffan153 🇫🇮 917 71 117ms 14 Oct 2022 427th Shanethegamer 🇺🇸 917 71 107ms 15 Oct 2022 427th stefangimmillaro 917 71 111ms 16 Oct 2022 427th MeWhenI 🇻🇦 917 71 115ms 16 Oct 2022 431st annaproxy 917 79 128ms 24 Aug 2022 431st GrayJoKing 🇦🇺 917 79 89ms 28 Aug 2022 431st IanUtley 917 79 119ms 3 Nov 2023 431st Kacarott 🇦🇺 917 79 135ms 13 Jun 2024 435th Steffan153 🇫🇮 916 71 6ms 10 Dec 2022 435th synt7x 🇺🇸 916 71 4ms 7 Jul 2025 437th JayXon 🇺🇸 916 79 784ms 5 Apr 2023 437th Lydxn 🇨🇦 916 79 810ms 9 Apr 2023 439th Steffan153 🇫🇮 916 81 26ms 11 Dec 2023 440th arctouch-cristiannevianna 916 85 366ms 3 Apr 2023 440th tomtheisen 🇺🇸 916 85 340ms 10 Apr 2025 442nd Natanaelel 🇸🇪 915 57 474ms 17 Jan 2024 442nd Kacarott 🇦🇺 915 57 425ms 10 Sep 2024 444th Shanethegamer 🇺🇸 915 61 5ms 9 Oct 2023 444th edsrzf 🇳🇿 915 61 4ms 4 Jul 2025 446th Shanethegamer 🇺🇸 915 87 390ms 15 May 2023 446th JayXon 🇺🇸 915 87 508ms 15 May 2023 446th Steffan153 🇫🇮 915 87 389ms 16 May 2023 446th Lydxn 🇨🇦 915 87 465ms 16 May 2023 446th GrayJoKing 🇦🇺 915 87 400ms 11 Aug 2023 First Prev 376–450 of 3,423 Next Last