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?
Van Eck Sequence in all languages 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 321st primo-ppcg 🇹🇭 873 195 12ms 13 Aug 2025 322nd prplz 🇦🇺 872 47 10ms 1 May 2021 322nd biocommando 🇫🇮 872 47 13ms 10 Aug 2023 324th GrayJoKing 🇦🇺 872 76 9ms 27 Jul 2023 325th primo-ppcg 🇹🇭 871 53 67ms 18 Sep 2023 325th Kacarott 🇦🇺 871 53 67ms 13 Sep 2024 327th namelessiw 870 89 469ms 15 Nov 2025 327th DialFrost 🇸🇬 870 89 514ms 16 Nov 2025 329th GrayJoKing 🇦🇺 869 83 462ms 14 Mar 2022 330th RockOfStone 867 56 2ms 5 Nov 2021 331st KasperKivimaeki 🇫🇮 866 110 288ms 29 Sep 2025 332nd sean-niemann 🇺🇸 865 71 94ms 30 Dec 2024 333rd bitsandbeyond 🇳🇱 864 45 698ms 5 Nov 2025 334th DialFrost 🇸🇬 864 77 118ms 30 Nov 2025 334th snoozingnewt 🇨🇦 864 77 123ms 30 Nov 2025 336th primo-ppcg 🇹🇭 864 84 365ms 21 Nov 2021 337th Shanethegamer 🇺🇸 862 68 82ms 27 May 2022 338th kg583 🇺🇸 861 85 53ms 14 days ago 339th primo-ppcg 🇹🇭 860 36 4ms 1 May 2021 339th HPWiz 🇳🇿 860 36 4ms 2 May 2021 341st Lydxn 🇨🇦 860 46 1,313ms 27 Jun 2023 342nd GolfingSuccess 🇬🇷 860 56 467ms 15 Jan 2024 342nd b-illy 🇬🇧 860 56 427ms 7 Sep 2024 342nd CornerMercury 🇬🇧 860 56 457ms 18 Dec 2025 345th MichalMarsalek 🇨🇿 860 61 142ms 15 Nov 2021 345th GrayJoKing 🇦🇺 860 61 143ms 8 May 2022 345th prestosilver 🇺🇸 860 61 143ms 5 days ago 348th GrayJoKing 🇦🇺 860 76 8ms 21 Feb 2026 349th jared-hughes 860 169 7ms 17 Mar 2023 350th hiichbindermax 859 63 11ms 17 Feb 2023 350th SB-945 859 63 11ms 2 Mar 2024 350th Emutis 🇱🇹 859 63 11ms 15 Feb 2025 353rd zacjl 858 81 47ms 14 Feb 2025 354th JayXon 🇺🇸 858 159 1,642ms 15 Sep 2025 355th MeWhenI 🇻🇦 857 170 1,154ms 18 Jan 2026 356th kg583 🇺🇸 856 59 27ms 17 days ago 356th Steffan153 🇫🇮 856 59 29ms 14 days ago 358th jared-hughes 855 28 33ms 23 Sep 2021 358th neel11235813 855 28 34ms 4 Mar 2023 360th m-tkach 🇺🇦 855 92 56ms 2 Jan 2022 360th inventshah 855 92 56ms 16 Dec 2022 360th 09cf 855 92 58ms 9 Sep 2023 360th ovs-code 🇩🇪 855 92 54ms 3 Jun 2024 360th KasperKivimaeki 🇫🇮 855 92 72ms 27 Nov 2025 365th dmrichwa 🇺🇸 854 48 12ms 25 Apr 2022 366th rucin93 🇵🇱 853 44 144ms 3 Aug 2024 367th stefangimmillaro 853 72 88ms 7 May 2023 368th clockworknazo 853 74 4ms 22 Nov 2022 369th emplv 🇱🇻 851 112 282ms 19 Feb 2022 370th GrayJoKing 🇦🇺 850 24 3ms 5 Jun 2025 371st m-tkach 🇺🇦 850 70 2ms 20 Dec 2021 371st ovs-code 🇩🇪 850 70 2ms 12 Feb 2023 371st ListeriaM 850 70 2ms 21 Aug 2023 374th primo-ppcg 🇹🇭 849 72 18ms 22 Jan 2023 375th Shanethegamer 🇺🇸 849 169 1,447ms 28 Apr 2025 376th TFeld00 🇩🇰 846 64 21ms 27 May 2021 376th SirBogman 🇺🇸 846 64 32ms 26 Nov 2021 376th AlephSquirrel 846 64 37ms 18 Apr 2023 376th msbranicky 846 64 11ms 25 Jul 2023 376th plcc0 846 64 47ms 6 Mar 2025 376th Pyroan 846 64 23ms 13 Mar 2025 376th BREMAUCY 🇫🇷 846 64 11ms 26 Jul 2025 376th wobblybits 846 64 16ms 21 Aug 2025 384th Shanethegamer 🇺🇸 845 57 439ms 16 Jan 2024 384th CaedenHarper 🇨🇦 845 57 444ms 10 Sep 2024 384th DialFrost 🇸🇬 845 57 463ms 30 Dec 2024 384th emgordon154 845 57 398ms 6 May 2025 384th snoozingnewt 🇨🇦 845 57 434ms 13 Oct 2025 384th Babafaba 845 57 449ms 22 Oct 2025 390th yeminghan2021 845 93 61ms 3 Feb 2025 391st namelessiw 844 86 388ms 16 Aug 2025 391st DialFrost 🇸🇬 844 86 394ms 16 Nov 2025 393rd primo-ppcg 🇹🇭 842 47 1,217ms 1 May 2021 393rd pardouin 🇫🇷 842 47 1,208ms 10 Sep 2025 395th ovs-code 🇩🇪 841 58 18ms 1 Jul 2024 396th Shanethegamer 🇺🇸 841 73 105ms 13 May 2021 397th stefangimmillaro 841 92 443ms 6 Oct 2025 398th Steffan153 🇫🇮 840 46 2ms 20 Jul 2024 398th sean-niemann 🇺🇸 840 46 2ms 28 Apr 2025 400th ovs-code 🇩🇪 839 171 1,458ms 9 Mar 2025 First Prev 321–400 of 1,875 Next Last