The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
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 876th albanian-laundromat 845 64 5ms 22 Sep 2025 882nd lynn 845 96 29ms 11 Jul 2023 883rd Shanethegamer 🇺🇸 845 98 119ms 26 Oct 2022 883rd emgordon154 845 98 121ms 18 Feb 2025 885th janAkali 🇷🇺 844 77 123ms 12 Feb 2025 886th bschorno 844 92 366ms 12 Oct 2022 886th ChrisTheisen 844 92 339ms 14 Dec 2022 886th kellantech 844 92 363ms 4 Jul 2023 886th Mezzofloat 844 92 377ms 26 Aug 2023 886th Maximizer02 844 92 360ms 1 Oct 2023 886th madeforlosers 844 92 365ms 21 Nov 2024 886th ChromaChroma 844 92 354ms 7 Oct 2025 886th snoozingnewt 🇨🇦 844 92 379ms 8 Oct 2025 894th DialFrost 🇸🇬 843 66 107ms 7 Apr 2025 894th KasperKivimaeki 🇫🇮 843 66 9ms 4 hours ago 896th dokutan 843 93 428ms 27 Sep 2025 897th krcs 🇵🇱 842 53 282ms 9 May 2022 897th ryanlanegit 842 53 301ms 19 Jun 2022 897th sisyphus-ppcg 🇦🇺 842 53 456ms 15 Aug 2022 900th MeWhenI 🇻🇦 842 71 106ms 13 Dec 2022 901st SirBogman 🇺🇸 842 89 38ms 4 May 2022 902nd error256 841 81 71ms 13 Sep 2024 903rd CLOStrophobic 🇮🇹 841 89 42ms 14 Feb 2025 904th kmathis22 841 100 31ms 13 Nov 2025 905th raszpi 🇭🇺 840 77 103ms 1 Sep 2023 906th eshilo-draper 839 75 86ms 6 Sep 2022 906th kmathis22 839 75 79ms 5 Sep 2025 908th sean-niemann 🇺🇸 839 76 107ms 8 Oct 2024 909th beardotpdf 839 99 346ms 10 days ago 910th emplv 🇱🇻 839 124 25ms 31 Oct 2022 911th Codsilla 🇨🇦 838 51 266ms 1 Jul 2022 912th frankgraziano 838 66 4ms 20 Apr 2025 913th Andriamanitra 🇫🇮 838 83 12ms 17 Apr 2023 913th Natanaelel 🇸🇪 838 83 12ms 8 Jul 2023 915th MeWhenI 🇻🇦 838 164 1,639ms 7 Nov 2025 916th Phil-RGOMEGA 837 83 4ms 1 Jun 2023 916th Maximizer02 837 83 5ms 1 Oct 2023 916th MWI-polygolf 837 83 4ms 6 Dec 2023 916th anarconic 837 83 4ms 8 Dec 2023 920th ovs-code 🇩🇪 837 85 15ms 11 Dec 2023 921st dokutan 837 88 39ms 9 Jun 2024 922nd Steffan153 🇫🇮 837 97 29ms 18 Jan 2023 923rd CatsAreFluffy 837 101 54ms 18 Feb 2023 923rd annaproxy 837 101 70ms 9 May 2023 923rd wojtekmal 837 101 78ms 15 Nov 2023 923rd HumanoidCPU 837 101 83ms 6 May 2024 923rd eMGeeneer 837 101 449ms 27 Jun 2024 923rd bac0id 837 101 77ms 29 Jun 2024 923rd michaelmoynihan 837 101 508ms 3 Sep 2025 923rd snoozingnewt 🇨🇦 837 101 517ms 6 Oct 2025 931st SirBogman 🇺🇸 835 36 14ms 5 May 2022 931st Natanaelel 🇸🇪 835 36 87ms 15 Jun 2022 931st Steffan153 🇫🇮 835 36 91ms 18 Jan 2023 931st codereport 🇨🇦 835 36 9ms 1 Jun 2024 931st GolfinK 835 36 9ms 21 Nov 2024 931st lifthrasiir 🇰🇷 835 36 10ms 1 Dec 2024 931st GolfingSuccess 🇬🇷 835 36 11ms 20 Mar 2025 938th scpchicken 🇵🇼 835 55 10ms 4 May 2022 938th SirBogman 🇺🇸 835 55 6ms 5 May 2022 938th Shanethegamer 🇺🇸 835 55 6ms 19 May 2023 938th DialFrost 🇸🇬 835 55 10ms 14 Feb 2025 942nd ChiefChippy2 835 56 51ms 4 May 2022 942nd aksyristos 835 56 42ms 29 Jan 2023 942nd anter69 🇭🇺 835 56 38ms 12 Feb 2024 942nd 3dm4n 🇫🇮 835 56 38ms 11 Mar 2024 942nd lgrandco 835 56 43ms 9 Oct 2024 942nd tatzyr 🇯🇵 835 56 43ms 10 Dec 2024 942nd D-MOVE 🇵🇭 835 56 49ms 14 days ago 949th inverseLorentz 🇦🇺 835 69 156ms 3 Jun 2024 949th Yewzir 🇧🇪 835 69 118ms 24 Dec 2024 949th CLOStrophobic 🇮🇹 835 69 170ms 28 May 2025 952nd p-vf 🇨🇭 835 93 337ms 24 Jun 2022 952nd Smetalo 835 93 384ms 25 Aug 2022 952nd malworthy 835 93 360ms 19 Aug 2024 955th moustave 834 67 23ms 7 Nov 2024 956th Alex-x90 🇺🇸 834 74 2ms 4 Dec 2022 956th undersquire 834 74 2ms 24 Jun 2023 956th rdmsr 834 74 2ms 24 Jun 2023 956th Bmrl7 834 74 2ms 9 Jul 2023 956th Vinterion 834 74 4ms 6 Nov 2023 First Prev 881–960 of 3,470 Next Last