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 634th silvncr 453 148 10ms 16 Jun 2021 634th inishawl 453 148 9ms 16 Jun 2021 634th theunofficialcoder 453 148 9ms 1 Sep 2021 634th kurkale6ka 453 148 10ms 7 Sep 2021 634th bwat2 453 148 10ms 2 Nov 2021 634th tston529 453 148 28ms 24 Feb 2022 634th SpareManiKatti 453 148 10ms 19 Apr 2022 634th kevdah 453 148 9ms 10 May 2022 634th cingulataluke 453 148 9ms 28 Aug 2023 634th bwenstar 453 148 10ms 21 Feb 2024 634th Ch3ngL0rd 453 148 10ms 5 Mar 2024 634th Bit125 453 148 10ms 28 Mar 2024 634th wuzekai518 453 148 9ms 15 Jul 2024 634th RedzGoose 🇦🇺 453 148 9ms 20 Oct 2024 634th itljan30 453 148 20ms 30 Jan 2025 634th RYSF13 🇨🇳 453 148 9ms 5 Jul 2025 657th knobz12 450 149 9ms 25 Apr 2021 657th osmith93 450 149 9ms 31 Jul 2021 657th aazuspan 450 149 14ms 25 Nov 2021 657th qwjhvbxi 450 149 34ms 6 Feb 2024 657th aaardwark 450 149 16ms 2 Jun 2025 662nd willzywiec 447 150 13ms 9 Aug 2018 662nd elldur 447 150 11ms 17 Mar 2019 662nd hardlyBearable 447 150 10ms 20 May 2019 662nd devRND-ess 447 150 12ms 29 Apr 2020 662nd chrishm909 447 150 15ms 31 May 2021 662nd janga1 447 150 113ms 16 Aug 2021 662nd murugan-k-0204 447 150 14ms 7 Oct 2022 662nd knyghty 447 150 9ms 17 Feb 2024 662nd willschremmer 447 150 25ms 14 May 2024 662nd VictorStenvers 🇳🇱 447 150 10ms 23 Apr 2025 662nd benvreeves 447 150 10ms 25 Jul 2025 673rd romglu 444 151 12ms 29 Sep 2018 673rd babakoban 444 151 9ms 30 Aug 2019 673rd AkshatAggarwal14 444 151 10ms 24 Jan 2022 673rd willdaspit 444 151 10ms 4 Aug 2023 673rd Glinte 444 151 9ms 13 Dec 2023 678th SethForrest 441 152 21ms 2 Feb 2019 678th CoffeeVector 441 152 22ms 22 Nov 2021 678th 104210 441 152 11ms 28 May 2022 678th Bananapants22 441 152 10ms 27 Aug 2022 682nd patricksliwinski 438 153 12ms 21 Jul 2019 682nd GameChaos 438 153 14ms 3 Sep 2020 682nd voidgloom 438 153 10ms 24 Oct 2024 685th lverweijen 435 154 10ms 17 Mar 2018 685th PineappleLord 435 154 10ms 22 Aug 2018 685th Thonoton 435 154 10ms 9 Mar 2023 685th DrPrettyman 435 154 12ms 6 Jul 2023 685th lchaumartin 435 154 9ms 22 Aug 2024 685th gsprochette 435 154 11ms 22 Aug 2025 691st hanyuone 432 155 20ms 3 Dec 2017 691st Joe0400Student 432 155 17ms 2 Nov 2021 691st eddvrs 432 155 32ms 20 Aug 2022 691st Jacob385 432 155 33ms 5 Mar 2024 691st cthierfelder 🇲🇨 432 155 16ms 3 Sep 2025 696th jm600 429 156 12ms 16 Apr 2022 696th tterem 429 156 9ms 8 Jun 2022 696th dylanjones92 429 156 20ms 25 Jan 2024 696th OSYCh314 🇦🇺 429 156 13ms 12 Nov 2024 696th kevinnaviapaiva 429 156 11ms 15 Feb 2025 701st Drummerboy444 427 157 12ms 16 Jun 2019 701st glf818 427 157 11ms 21 Jul 2021 701st wobblybits 427 157 12ms 23 Aug 2025 704th VictorFordham 424 158 21ms 11 Aug 2020 704th HSavich 424 158 42ms 2 Dec 2021 704th bthalheim 424 158 11ms 8 Sep 2022 707th HorseScary 421 159 9ms 16 Nov 2021 708th EmadAIsmael 419 160 27ms 16 Jan 2019 708th jpyCode 419 160 22ms 24 Feb 2019 708th CodyKlingler 419 160 20ms 7 Feb 2025 711th zerickso 416 161 18ms 17 Mar 2024 711th SURAJMITTAL 416 161 11ms 19 Dec 2024 711th NoneTheFewer 416 161 12ms 25 Dec 2025 714th monishnene 414 162 99ms 1 Mar 2019 714th KiwiKoder0123 414 162 14ms 22 Jun 2019 714th ItsMeNoobieboy 414 162 24ms 23 Dec 2022 714th ComputerKWasTaken 🇺🇸 414 162 10ms 1 Jun 2024 718th biinari 411 163 17ms 19 Mar 2018 718th andrew-l-wilson 411 163 16ms 22 Apr 2020 720th Zindu 409 164 9ms 6 Mar 2019 First Prev 641–720 of 813 Next Last