The Multitap Input hole will go live in approximately 20 hours. Why not try and solve it ahead of time?
ISBN 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 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 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 ArkScript 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 ArkScript 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 Calendar 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 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 Bytes Time Submitted 241st amollberg 🇸🇪 705 129 10ms 21 Jan 2022 241st jfallon1997 705 129 10ms 18 Aug 2022 241st CameronGBell 705 129 10ms 10 Nov 2022 241st 2011-Chan-Ethan 705 129 17ms 20 Jul 2023 241st inverseLorentz 🇦🇺 705 129 10ms 8 Oct 2023 241st trsav 705 129 16ms 29 Oct 2023 241st aalec 705 129 15ms 24 Apr 2024 241st Europe2048 705 129 9ms 16 Mar 2025 241st pquline 705 129 11ms 23 Apr 2025 241st webmiche 705 129 10ms 3 Nov 2025 251st AkashTandon167 700 130 11ms 18 Jan 2022 251st feherd 700 130 17ms 16 Apr 2022 251st caraar12345 700 130 10ms 27 May 2022 251st ordinary-slim 700 130 10ms 18 Nov 2022 251st bonevbs 700 130 10ms 18 Nov 2022 251st mbittner20 700 130 10ms 27 May 2023 251st resoNathan 700 130 9ms 13 May 2024 251st codingisgreatbutiamnot 700 130 11ms 9 Aug 2024 251st NanduBC 700 130 9ms 3 Sep 2024 260th michelebastione 🇮🇹 695 131 17ms 14 Jan 2022 260th midnattssol 🇸🇪 695 131 10ms 19 May 2022 260th aksyristos 695 131 15ms 11 Jun 2023 260th alexjurkiewicz 🇦🇺 695 131 10ms 8 Nov 2023 260th sciencedjinn 695 131 10ms 8 Nov 2024 260th wobblybits 695 131 16ms 15 Aug 2025 260th cthierfelder 🇲🇨 695 131 10ms 12 Sep 2025 260th kayaulai 695 131 10ms 23 Nov 2025 268th twocatsinatrenchcoat 689 132 9ms 10 May 2022 268th P-Quentin 🇫🇷 689 132 11ms 5 Aug 2022 268th dillon-duncando 689 132 10ms 19 Oct 2022 268th eiburns 689 132 11ms 11 Oct 2023 268th wh3n3v3r 🇨🇿 689 132 11ms 11 Nov 2024 268th estomagordo 🇳🇱 689 132 9ms 25 Mar 2025 274th adoxography 684 133 10ms 20 Jan 2022 274th jhpaques 🇫🇷 684 133 9ms 26 Jul 2022 274th dranjohn 684 133 10ms 10 Sep 2023 274th countlpaul-dotcom 684 133 16ms 19 Oct 2025 278th zoemarschner 679 134 10ms 16 May 2022 278th nullie 679 134 10ms 8 Jun 2022 278th thomasklunker 679 134 9ms 20 Feb 2023 278th Starwort 🇬🇧 679 134 9ms 17 Mar 2023 278th cingulataluke 679 134 10ms 29 Aug 2023 278th yuchuehw 679 134 10ms 22 Jan 2024 278th hiichbindermax 679 134 9ms 17 Sep 2024 285th petroselo 674 135 10ms 9 Apr 2022 285th trist224 🇫🇷 674 135 10ms 29 Sep 2022 285th mrmena 🇦🇺 674 135 18ms 16 Apr 2024 288th kyleclaassen 669 136 9ms 9 Feb 2022 288th za3k 669 136 10ms 8 Oct 2022 288th shibacho 🇯🇵 669 136 10ms 30 Nov 2022 288th chlorobenzene12 669 136 10ms 26 Dec 2022 288th Schreipfelerer 669 136 10ms 11 Sep 2024 288th hamilton-bonds 669 136 10ms 12 Nov 2024 288th ffelixm 669 136 9ms 7 Jun 2025 295th MathieuIko 664 137 10ms 21 Feb 2022 295th RDShah 664 137 11ms 18 May 2022 295th cameronezell 664 137 10ms 19 Jul 2022 295th enbyte 664 137 16ms 20 Dec 2022 299th Troon 659 138 15ms 11 Oct 2022 299th nayakrujul 659 138 16ms 3 Jan 2023 299th celiendonze 🇨🇭 659 138 10ms 20 Apr 2023 299th willdaspit 659 138 9ms 6 Aug 2023 299th GitQuick 659 138 10ms 9 Mar 2024 304th brochmann 🇸🇪 655 139 9ms 6 Feb 2022 304th halp1 655 139 9ms 8 Apr 2022 304th GeneralTwi 655 139 9ms 2 May 2022 304th AliceFord 655 139 10ms 2 Jun 2022 304th luftj 655 139 10ms 9 Aug 2022 304th pustovalovm 655 139 10ms 16 Jan 2023 310th nmgetahun 650 140 10ms 5 Dec 2022 311th LeeCamp 645 141 10ms 12 Jan 2023 311th drochom 645 141 16ms 22 Jun 2024 313th bsoyka 🇺🇸 641 142 10ms 16 Jul 2022 313th Jacob385 641 142 9ms 17 Sep 2024 313th ComputerKWasTaken 🇺🇸 641 142 10ms 21 Jan 2025 313th Andrey2001 641 142 17ms 11 hours ago 317th zt14427 636 143 10ms 6 Oct 2023 317th AtengChen 636 143 15ms 7 Sep 2024 319th SniperSmiley 🇺🇸 632 144 9ms 26 Jun 2022 319th rustykitty 🇺🇸 632 144 16ms 28 Oct 2025 First Prev 241–320 of 368 Next Last