The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Emirp Numbers in Python 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 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 Chars Time Submitted 721st biinari 337 163 17ms 19 Mar 2018 721st andrew-l-wilson 337 163 16ms 22 Apr 2020 723rd Zindu 335 164 9ms 6 Mar 2019 723rd sambirnbaum1 335 164 13ms 5 Sep 2019 723rd jjbvtk 335 164 13ms 8 Sep 2021 723rd fl3ur1nestimable 335 164 9ms 2 Apr 2022 727th atazzam 🇺🇸 333 165 13ms 6 Mar 2022 727th zstephe 333 165 32ms 6 Dec 2022 729th Loag 331 166 15ms 7 Sep 2024 729th Akilles1 331 166 52ms 10 Apr 2025 731st EnisEfe0 329 167 19ms 18 May 2025 732nd jerkmuffin 325 169 12ms 5 Aug 2018 732nd confy 325 169 19ms 25 Oct 2020 732nd Mr-McChicken 325 169 28ms 16 Oct 2023 735th dave-ck 324 170 29ms 3 Mar 2018 735th Kiwiatomik 324 170 11ms 28 Jul 2019 737th dddthedark 320 172 13ms 22 Jun 2019 738th Santiago-Dubov 318 173 12ms 12 Jul 2019 738th scottJsonar 318 173 10ms 28 Nov 2019 738th jrbud 318 173 11ms 9 Jan 2024 741st achow0 314 175 15ms 5 Aug 2020 742nd StoverGitHub 313 176 12ms 15 Jun 2022 742nd gelvetica 313 176 12ms 17 Nov 2024 744th kpasc 311 177 13ms 22 Dec 2017 744th Stealth-py 311 177 66ms 10 Jul 2019 744th j3mak 311 177 33ms 17 Jan 2024 747th sanssaraf 309 178 12ms 2 May 2020 748th kittrz9 307 179 9ms 7 Dec 2017 748th aw-west 307 179 10ms 8 Oct 2018 748th SnehanjanChatterjee 307 179 10ms 20 Dec 2018 748th breeezi 307 179 11ms 7 Feb 2020 748th uBagout 307 179 10ms 6 Oct 2020 748th KatieLG-Transpiler 🇬🇧 307 179 9ms 23 Jun 2022 748th zt14427 307 179 10ms 18 Nov 2023 748th kasarino 307 179 10ms 6 Feb 2026 756th dcure73 306 180 12ms 7 Jun 2019 757th lovernj 302 182 10ms 28 Jan 2022 757th IrisWintermute 302 182 24ms 31 Jul 2024 759th newc0m 299 184 12ms 12 Apr 2019 759th dens558 299 184 22ms 25 May 2019 759th valgardg 🇮🇸 299 184 19ms 6 Sep 2021 762nd Frowny 296 186 14ms 1 Dec 2021 763rd chriscconte 293 188 10ms 16 Apr 2019 764th markbyrne 291 189 15ms 22 Oct 2020 765th wadefletch 289 190 33ms 2 Oct 2019 765th jmmographer 289 190 14ms 22 Oct 2023 765th Leon-Degel-Koehn 289 190 27ms 21 May 2024 768th hotmanga 288 191 9ms 27 Oct 2023 768th xbxbxb007 288 191 10ms 10 Jan 2024 770th joakimalsbjergdich 286 192 10ms 18 Jan 2019 770th opsullivan85 286 192 10ms 2 Jun 2019 772nd kaushalrathi24 282 195 11ms 23 Apr 2024 773rd DylanGodfrey 278 198 13ms 5 Jun 2018 773rd uncertaain 278 198 12ms 14 Dec 2024 775th codewrite 🇬🇧 266 207 10ms 4 Jul 2025 776th Secozzi 262 210 16ms 1 Mar 2021 777th scientizt 259 212 9ms 25 Jan 2019 778th juliantamayo-py 258 213 18ms 20 Oct 2024 779th rajlath 256 215 11ms 8 Apr 2018 779th lundas 256 215 25ms 25 Dec 2018 779th StronkCheese 🇺🇸 256 215 14ms 11 Sep 2023 782nd muser-logiccpu 🇺🇦 255 216 10ms 16 Aug 2025 783rd Nibamot 244 225 13ms 22 Dec 2021 784th vlhommeau 240 229 35ms 12 Oct 2018 785th noahdorsch 234 235 21ms 7 Mar 2025 786th puzzleninja 233 236 11ms 18 Jul 2019 787th joe0400 231 238 55ms 23 Sep 2019 788th ablicq 224 246 13ms 25 Dec 2018 788th ErikvdVen 224 246 17ms 30 Jul 2019 790th joshvd 217 254 12ms 31 Aug 2019 791st thomashastings 216 255 23ms 15 Apr 2021 792nd Unknownuserfrommars 213 258 10ms 22 Nov 2024 793rd ericmarkmartin 201 273 11ms 11 Jul 2019 794th lovepeacejoy404 196 281 15ms 4 Feb 2019 795th clodalala 190 289 12ms 12 Nov 2019 796th dahappy1989 182 302 34ms 5 Nov 2023 797th Noooiz 179 308 33ms 30 Dec 2018 798th eje24 175 314 11ms 27 Jul 2020 799th returnitynet 172 319 32ms 2 Jan 2025 800th gregfromstl 172 320 37ms 16 Oct 2018 First Prev 721–800 of 814 Next Last
