The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Van Eck Sequence in all languages 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 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 Calendar 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 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 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 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 Calendar 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 Chars Time Submitted 235th Steffan153 🇫🇮 889 18 69ms 15 Aug 2024 235th emgordon154 889 18 98ms 10 Sep 2024 235th plcc0 889 18 108ms 6 Apr 2025 244th GrayJoKing 🇦🇺 889 48 8ms 29 Jan 2025 245th Lydxn 🇨🇦 889 81 440ms 10 Apr 2022 246th rak1507 🇬🇧 887 23 3ms 21 Jan 2022 247th ashtraypettingzoo 🇺🇸 886 27 33ms 23 Feb 2023 247th HPWiz 🇳🇿 886 27 33ms 16 Aug 2023 249th primo-ppcg 🇹🇭 886 53 67ms 18 Sep 2023 249th Kacarott 🇦🇺 886 53 71ms 13 Sep 2024 251st emplv 🇱🇻 885 41 6ms 6 May 2021 251st Steffan153 🇫🇮 885 41 4ms 25 Aug 2024 251st sean-niemann 🇺🇸 885 41 5ms 28 Apr 2025 254th CLOStrophobic 🇮🇹 885 69 17ms 20 Jan 2025 254th kg583 🇺🇸 885 69 17ms 20 Jan 2025 256th Lydxn 🇨🇦 884 35 3ms 28 Jun 2023 257th neihousaigaai 884 58 11ms 3 May 2021 257th OllieBoyne 🇬🇧 884 58 12ms 14 May 2021 257th TobyBoyne 🇬🇧 884 58 10ms 14 May 2021 257th yzhs 🇩🇪 884 58 11ms 27 Jun 2021 257th lzahray 884 58 11ms 24 Oct 2022 257th DialFrost 🇸🇬 884 58 19ms 26 Jul 2024 257th KasperKivimaeki 🇫🇮 884 58 11ms 5 Jul 2025 257th wuduculfre 884 58 11ms 21 Jul 2025 265th primo-ppcg 🇹🇭 884 69 39ms 11 Jul 2022 266th JayXon 🇺🇸 884 73 3,522ms 12 Nov 2024 266th pardouin 🇫🇷 884 73 4,237ms 27 Dec 2024 268th canissimia 🇦🇶 884 228 42ms 19 Jun 2022 269th btnlq 883 44 424ms 1 May 2021 270th Lydxn 🇨🇦 883 48 996ms 28 Jun 2023 270th HPWiz 🇳🇿 883 48 1,096ms 9 Jan 2024 272nd Steffan153 🇫🇮 882 55 2ms 31 Jan 2023 272nd frosster 882 55 2ms 26 Feb 2025 274th Shanethegamer 🇺🇸 882 78 1,351ms 15 Mar 2023 275th Steffan153 🇫🇮 881 56 3ms 18 Jul 2024 275th rucin93 🇵🇱 881 56 3ms 1 Jun 2025 277th zacjl 881 61 34ms 15 Dec 2024 278th m-tkach 🇺🇦 881 95 24ms 10 May 2023 279th m-tkach 🇺🇦 880 90 34ms 15 Jan 2024 280th kg583 🇺🇸 879 79 42ms 14 Feb 2025 281st canissimia 🇦🇶 879 107 408ms 29 Jun 2022 282nd Lydxn 🇨🇦 878 44 2ms 30 Oct 2022 282nd primo-ppcg 🇹🇭 878 44 2ms 7 Nov 2022 284th JayXon 🇺🇸 878 82 461ms 28 Feb 2022 285th m-tkach 🇺🇦 877 93 6ms 12 Jun 2022 285th MeWhenI 🇻🇦 877 93 7ms 16 May 2023 287th primo-ppcg 🇹🇭 876 41 9ms 19 May 2021 288th stefangimmillaro 876 42 37ms 7 Apr 2023 289th Shanethegamer 🇺🇸 876 63 79ms 1 Jun 2022 290th ovs-code 🇩🇪 875 55 388ms 15 Jan 2024 290th GrayJoKing 🇦🇺 875 55 386ms 16 Jan 2024 290th lifthrasiir 🇰🇷 875 55 348ms 2 Dec 2024 293rd snyderek 🇺🇸 874 90 67ms 9 Nov 2024 294th AdrienHache 🇫🇷 873 83 397ms 19 Sep 2025 295th prplz 🇦🇺 872 47 9ms 1 May 2021 295th biocommando 🇫🇮 872 47 9ms 10 Aug 2023 297th Shanethegamer 🇺🇸 872 60 134ms 17 Feb 2023 298th AlephSquirrel 872 70 20ms 19 Jan 2025 299th GrayJoKing 🇦🇺 872 76 9ms 27 Jul 2023 300th TimHuisman1703 869 59 10ms 7 Jan 2022 300th anter69 🇭🇺 869 59 21ms 22 Jan 2022 300th KatieLG 🇬🇧 869 59 50ms 11 Dec 2022 300th wuzekai518 869 59 10ms 28 Jun 2024 300th albanian-laundromat 869 59 11ms 30 Jul 2025 300th RaBa21 🇭🇺 869 59 11ms 11 Aug 2025 300th Lv0Sys 🇵🇱 869 59 11ms 13 days ago 307th namelessiw 869 88 367ms 15 Nov 2025 307th DialFrost 🇸🇬 869 88 450ms 16 Nov 2025 309th primo-ppcg 🇹🇭 869 195 12ms 13 Aug 2025 310th GrayJoKing 🇦🇺 868 83 450ms 14 Mar 2022 311th RockOfStone 866 56 2ms 5 Nov 2021 312th sean-niemann 🇺🇸 865 71 87ms 30 Dec 2024 313th DialFrost 🇸🇬 865 76 108ms 18 days ago 313th snoozingnewt 🇨🇦 865 76 131ms 18 days ago 315th bitsandbeyond 🇳🇱 864 45 663ms 5 Nov 2025 316th primo-ppcg 🇹🇭 863 84 317ms 21 Nov 2021 317th sean-niemann 🇺🇸 862 68 2ms 2 Jan 2025 318th b-illy 🇬🇧 860 56 363ms 7 Sep 2024 319th jared-hughes 860 169 8ms 17 Mar 2023 320th primo-ppcg 🇹🇭 859 36 4ms 1 May 2021 First Prev 241–320 of 1,786 Next Last