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 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 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 Bytes Time Submitted 636th wh3n3v3r 🇨🇿 712 76 16ms 14 Nov 2024 642nd sean-niemann 🇺🇸 710 110 121ms 9 Jun 2025 643rd emplv 🇱🇻 709 118 26ms 29 Jun 2022 644th rak1507 🇬🇧 708 76 137ms 29 Jun 2021 644th GrayJoKing 🇦🇺 708 76 130ms 14 Mar 2022 646th Irratix 🇳🇱 708 111 64ms 3 Jan 2022 646th Yewzir 🇧🇪 708 111 91ms 11 Feb 2024 648th emgordon154 707 52 53ms 27 Nov 2024 648th olleicua 🇺🇸 707 52 43ms 25 Feb 2025 648th codereport 🇨🇦 707 52 37ms 21 Apr 2025 648th snoozingnewt 🇨🇦 707 52 56ms 13 Oct 2025 652nd emgordon154 707 203 502ms 6 Nov 2025 653rd KatieLG 🇬🇧 706 56 987ms 13 Oct 2021 654th Shanethegamer 🇺🇸 704 34 34ms 6 May 2021 654th MeWhenI 🇻🇦 704 34 34ms 9 Nov 2021 654th sisyphus-ppcg 🇦🇺 704 34 35ms 2 Mar 2022 654th DialFrost 🇸🇬 704 34 34ms 18 Jan 2023 658th jared-hughes 704 51 6ms 17 Jul 2022 659th snoozingnewt 🇨🇦 704 63 129ms 19 days ago 660th razetime 703 29 3ms 13 Jan 2022 661st snoozingnewt 🇨🇦 703 69 2ms 13 Oct 2025 662nd LeeCamp 703 77 23ms 23 Dec 2021 662nd Just4FunCoder 703 77 19ms 23 Mar 2023 662nd codewrite 🇬🇧 703 77 11ms 9 Jul 2025 662nd vhoulbreque 🇫🇷 703 77 11ms 15 days ago 666th Herbert00709 🇵🇱 702 112 58ms 1 Nov 2024 667th GolfingSuccess 🇬🇷 701 81 18ms 11 Sep 2022 668th emgordon154 700 85 2ms 24 Dec 2021 669th MeWhenI 🇻🇦 700 194 1,704ms 7 Nov 2025 670th commandblockguy 🇺🇸 698 69 472ms 15 Jan 2024 670th TheZwierzLF 🇵🇱 698 69 414ms 26 days ago 672nd luuumine 🇫🇷 698 112 116ms 16 Nov 2025 673rd Shanethegamer 🇺🇸 697 111 431ms 25 Sep 2025 673rd snoozingnewt 🇨🇦 697 111 441ms 13 Oct 2025 675th Shanethegamer 🇺🇸 696 73 23ms 28 Apr 2023 676th oceko 696 113 82ms 19 Feb 2024 677th MeWhenI 🇻🇦 695 114 29ms 7 Jun 2023 678th adoxography 694 53 44ms 20 Aug 2021 678th schachmattmatt 694 53 63ms 25 Sep 2021 678th anter69 🇭🇺 694 53 48ms 9 Jan 2023 678th tatzyr 🇯🇵 694 53 61ms 18 Jan 2025 682nd Indivicivet 694 78 58ms 26 Oct 2021 682nd SirFireball3521 694 78 16ms 14 Mar 2023 682nd Alex-x90 🇺🇸 694 78 19ms 6 Nov 2023 685th MeWhenI 🇻🇦 692 90 41ms 17 Feb 2023 686th ian-h-chamberlain 🇺🇸 692 113 122ms 6 Jul 2022 687th frankgraziano 692 245 15ms 30 Sep 2025 688th Shanethegamer 🇺🇸 691 78 101ms 15 Oct 2022 689th MeWhenI 🇻🇦 690 56 2ms 4 Nov 2022 690th arjanadriaanse 🇳🇱 690 78 141ms 10 Feb 2022 690th tobeannouncd 690 78 1,395ms 8 Jan 2024 692nd kkoenig 690 138 267ms 4 Jan 2024 693rd HumanoidCPU 688 70 391ms 25 May 2024 694th o0lit3 🇺🇸 687 45 11ms 4 May 2021 695th Fishron 685 79 48ms 19 Oct 2021 695th pascscha 685 79 16ms 28 Mar 2022 695th 2011-Chan-Ethan 685 79 60ms 10 Jul 2023 698th msbranicky 684 83 2ms 4 Aug 2023 699th voytxt 🇨🇿 683 55 129ms 3 Aug 2024 700th Naruyoko 683 60 13ms 13 Aug 2023 700th two-bad 🇬🇧 683 60 20ms 15 Feb 2024 700th emgordon154 683 60 21ms 6 May 2025 700th Yax42 🇫🇷 683 60 10ms 9 Sep 2025 704th albanian-laundromat 683 248 13ms 18 Sep 2025 705th Shanethegamer 🇺🇸 680 30 3ms 5 Nov 2023 705th MeWhenI 🇻🇦 680 30 3ms 6 Nov 2023 707th rucin93 🇵🇱 679 114 540ms 24 Sep 2025 708th albanian-laundromat 678 57 2ms 14 days ago 709th Shanethegamer 🇺🇸 677 107 341ms 27 May 2022 710th MeWhenI 🇻🇦 676 73 3ms 10 Oct 2023 711th jacklynnepenick 676 80 43ms 26 Aug 2021 711th hellwue 676 80 11ms 2 Mar 2022 711th b10011 🇫🇮 676 80 25ms 8 Jan 2023 714th emgordon154 674 116 144ms 22 Feb 2025 715th heypwesto 🇳🇿 672 46 2ms 3 Jun 2021 716th MeWhenI 🇻🇦 672 54 5ms 29 May 2023 717th FlorianCassayre 🇫🇷 672 61 9ms 22 Jan 2023 718th DialFrost 🇸🇬 672 94 21ms 27 Sep 2024 719th Shanethegamer 🇺🇸 672 117 78ms 28 Dec 2022 720th Natanaelel 🇸🇪 671 51 120ms 12 Feb 2023 First Prev 641–720 of 1,805 Next Last