Collatz in all languages in chars. 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 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 Calendar 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 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 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 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 Calendar 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 Chars Time Submitted 506th LostSyntax21 🇬🇧 888 60 11ms 10 Sep 2024 506th xyangst 888 60 10ms 28 Sep 2024 506th a6166231 🇨🇳 888 60 9ms 15 May 2025 506th Protothor 888 60 10ms 8 Jul 2025 506th SebassNoob 888 60 10ms 5 Aug 2025 506th Yax42 🇫🇷 888 60 10ms 5 Sep 2025 506th levinwinter 888 60 10ms 22 Oct 2025 506th Cube14yt 888 60 10ms 26 days ago 506th gigaprofisi 🇺🇸 888 60 10ms 24 days ago 535th Lydxn 🇨🇦 888 107 263ms 6 May 2022 535th CaedenHarper 🇨🇦 888 107 308ms 5 Oct 2025 537th P-Quentin 🇫🇷 887 63 18ms 3 Aug 2022 537th kaptsanovb 887 63 28ms 20 Apr 2023 537th fkantelberg 887 63 20ms 14 Jul 2023 537th VictorStenvers 🇳🇱 887 63 22ms 13 Nov 2023 537th 1231234md5 🇨🇳 887 63 18ms 14 Dec 2023 537th f-tucker 887 63 23ms 6 Feb 2024 537th JunkIce 887 63 23ms 24 Nov 2024 537th Kowalskiexe 🇵🇱 887 63 19ms 19 Apr 2025 537th 123mjb 887 63 23ms 2 Jun 2025 537th DrakeSeteraO 887 63 52ms 24 Oct 2025 547th RockOfStone 887 73 4ms 20 Oct 2025 548th JayXon 🇺🇸 887 74 2,888ms 14 Nov 2024 549th jared-hughes 887 130 23ms 15 Dec 2024 550th canissimia 🇦🇶 887 204 16ms 25 Nov 2023 551st Shanethegamer 🇺🇸 886 61 5ms 31 Oct 2022 551st MeWhenI 🇻🇦 886 61 5ms 4 Nov 2022 553rd lynn 886 65 283ms 5 May 2022 553rd GrayJoKing 🇦🇺 886 65 250ms 5 May 2022 553rd Sakisan 🇧🇪 886 65 178ms 6 May 2022 553rd JayXon 🇺🇸 886 65 311ms 17 Oct 2022 553rd Steffan153 🇫🇮 886 65 185ms 12 Nov 2022 553rd tobeannouncd 886 65 312ms 25 Apr 2025 553rd sean-niemann 🇺🇸 886 65 168ms 9 Jun 2025 560th stefangimmillaro 886 71 87ms 2 Oct 2022 560th Steffan153 🇫🇮 886 71 94ms 23 Feb 2023 560th Shanethegamer 🇺🇸 886 71 90ms 16 May 2023 560th sean-niemann 🇺🇸 886 71 86ms 12 Jul 2024 564th Shanethegamer 🇺🇸 886 72 90ms 8 May 2025 564th edsrzf 🇳🇿 886 72 103ms 4 Jul 2025 564th Yewzir 🇧🇪 886 72 92ms 21 days ago 567th DialFrost 🇸🇬 886 95 29ms 10 Dec 2024 568th canissimia 🇦🇶 886 110 2,640ms 20 Feb 2023 569th GrayJoKing 🇦🇺 885 77 96ms 13 Sep 2024 570th Steffan153 🇫🇮 884 52 7ms 31 Dec 2022 571st albanian-laundromat 884 94 415ms 24 Sep 2025 571st jkelly467 884 94 544ms 23 Oct 2025 571st HumanoidCPU 884 94 397ms 8 Nov 2025 574th DialFrost 🇸🇬 883 76 81ms 17 Mar 2025 575th stefangimmillaro 882 53 35ms 2 Oct 2022 575th Haksell 🇦🇶 882 53 36ms 22 Feb 2023 577th GrayJoKing 🇦🇺 882 70 3ms 6 May 2022 577th ovs-code 🇩🇪 882 70 2ms 8 Oct 2023 577th 09cf 882 70 2ms 8 Oct 2023 577th saito-ta 🇯🇵 882 70 2ms 21 Dec 2023 577th sean-niemann 🇺🇸 882 70 2ms 10 Jul 2024 577th KasperKivimaeki 🇫🇮 882 70 6ms 8 Aug 2025 583rd primo-ppcg 🇹🇭 882 85 39ms 14 Jan 2025 583rd MeWhenI 🇻🇦 882 85 41ms 21 Apr 2025 585th SiestaGuru 882 88 326ms 9 Jan 2023 585th rifatx 882 88 322ms 5 Jul 2024 585th kmathis22 882 88 367ms 25 Sep 2025 585th arcpolaris 882 88 391ms 8 Nov 2025 589th primo-ppcg 🇹🇭 881 52 211ms 5 May 2022 589th dvargas46 🇺🇸 881 52 85ms 22 Dec 2022 591st DialFrost 🇸🇬 881 56 863ms 1 Sep 2025 592nd ovs-code 🇩🇪 881 89 438ms 24 Jul 2024 592nd jipsong 🇩🇪 881 89 467ms 7 Apr 2025 594th nipzu 881 94 116ms 17 May 2022 594th Natanaelel 🇸🇪 881 94 125ms 17 Jun 2022 594th nkoppel 881 94 120ms 19 Oct 2022 594th ovs-code 🇩🇪 881 94 120ms 21 Jun 2023 594th mousetail 🇳🇱 881 94 124ms 12 Jan 2024 599th snoozingnewt 🇨🇦 881 95 109ms 8 days ago 600th Irratix 🇳🇱 881 96 53ms 4 May 2022 First Prev 526–600 of 3,493 Next Last