The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Emirp Numbers 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 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 Gray Code Decoder Gray Code Encoder 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 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 Gray Code Decoder Gray Code Encoder 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 228th TobyBoyne 🇬🇧 626 107 15ms 16 Jan 2023 228th jfallon1997 626 107 14ms 29 Apr 2024 228th stertooy 🇧🇪 626 107 15ms 9 Jun 2024 228th rollershutter 626 107 11ms 18 Nov 2024 228th keegan-t 🇨🇦 626 107 15ms 23 Apr 2025 246th petar-donchev 620 108 13ms 2 Sep 2019 246th Informagier 620 108 53ms 17 Sep 2020 246th KrausRaus 🇺🇸 620 108 11ms 9 Apr 2021 246th urojony 🇵🇱 620 108 15ms 27 May 2021 246th petroselo 620 108 15ms 29 Dec 2021 246th kyleclaassen 620 108 14ms 11 Mar 2022 246th P-Quentin 🇫🇷 620 108 13ms 3 Aug 2022 246th Bulmenisaurus 620 108 15ms 18 Feb 2023 246th ehulinsky 🇺🇸 620 108 27ms 7 May 2023 246th tobyLovick 620 108 15ms 11 Dec 2023 246th jbjd 620 108 22ms 23 Feb 2024 246th sultan 620 108 36ms 27 Mar 2024 246th elgan65536 🇺🇸 620 108 15ms 7 Apr 2024 246th fgrosshans 🇫🇷 620 108 15ms 17 Jul 2024 246th evan18c 620 108 15ms 23 Apr 2025 246th 40fied4t 620 108 35ms 5 May 2025 262nd zdzc 615 109 15ms 8 Feb 2018 262nd ebicochineal 615 109 82ms 21 Jun 2019 262nd dzhang314 615 109 42ms 13 Aug 2019 262nd loserface69 615 109 14ms 14 Mar 2020 262nd tpaxman 🇨🇦 615 109 16ms 2 Dec 2020 262nd stordev 615 109 15ms 26 Feb 2021 262nd Omega65536 🇩🇪 615 109 14ms 24 Nov 2022 262nd BREMAUCY 🇫🇷 615 109 11ms 11 May 2023 262nd AlexanderFair 615 109 13ms 18 Jul 2023 262nd Re-Adventures 🇮🇳 615 109 15ms 27 Jul 2023 262nd SB-945 615 109 27ms 13 Feb 2024 262nd vhoulbreque 🇫🇷 615 109 15ms 9 Apr 2024 262nd Lewenhaupt 615 109 55ms 19 Apr 2024 275th PiterAnnema 609 110 16ms 28 Aug 2020 275th cesarm4 609 110 126ms 6 Jan 2021 275th HerLovelyTentacles 609 110 14ms 8 Feb 2021 275th forlack 609 110 15ms 29 Oct 2021 275th Natanaelel 🇸🇪 609 110 12ms 16 Aug 2022 275th fredrik-bakke 🇳🇴 609 110 50ms 3 Nov 2022 275th randolchance 609 110 16ms 15 Jan 2023 275th jtaxen 609 110 12ms 23 Jul 2023 275th EnTerr 609 110 20ms 25 Aug 2024 275th jamesthekee 609 110 15ms 25 Jan 2025 275th Googolplexo 🇷🇺 609 110 26ms 4 hours ago 286th tkwa 604 111 15ms 4 Dec 2018 286th jrobert2 604 111 14ms 19 Dec 2018 286th hoodadam 604 111 9ms 5 Jul 2019 286th fynnkroeger 604 111 15ms 18 Feb 2021 286th jameslindesay 604 111 14ms 24 Feb 2021 286th gilufin 604 111 15ms 23 May 2021 286th evanrittner 604 111 14ms 5 Jun 2021 286th badboj40 604 111 13ms 27 Dec 2022 286th Pale-Vessel 604 111 13ms 27 Dec 2023 286th logvp 604 111 52ms 12 Jan 2024 286th yuchuehw 604 111 13ms 17 Jun 2024 286th moustave 604 111 12ms 2 Dec 2024 286th jacekwladzinski 604 111 14ms 2 Oct 2025 286th FranklinJiaChen 604 111 59ms 23 Feb 2026 300th alangodfrey 598 112 15ms 11 Jun 2019 300th Malin001 598 112 25ms 4 Jan 2020 300th 130N35 598 112 16ms 22 Jan 2020 300th dyc3 598 112 15ms 1 Sep 2020 300th Espiobest 598 112 23ms 13 Feb 2021 300th NanduBC 598 112 14ms 17 Mar 2021 300th asheeri 598 112 24ms 17 Aug 2021 300th hinser 598 112 37ms 30 Nov 2021 300th eshilo-draper 598 112 13ms 1 Nov 2022 300th b10011 🇫🇮 598 112 21ms 10 Jan 2023 300th jmfk 598 112 14ms 19 Apr 2024 300th Ythaenagor 598 112 14ms 5 Aug 2024 300th agreegious 598 112 11ms 17 Nov 2024 300th Alban-Boissard 598 112 147ms 14 Jun 2025 300th addmai 598 112 15ms 25 Jul 2025 300th osNiko 🇧🇷 598 112 12ms 21 Aug 2025 300th Andrey2001 598 112 19ms 24 Nov 2025 300th netfri25 🇮🇱 598 112 14ms 17 Feb 2026 318th timkaiser 593 113 49ms 19 Apr 2019 318th nullie 593 113 12ms 31 Jul 2019 318th jmhowl 593 113 11ms 17 Dec 2019 First Prev 241–320 of 813 Next Last
