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 721st Skwerl23 670 58 364ms 6 Feb 2023 722nd MeWhenI 🇻🇦 670 68 699ms 15 Sep 2025 723rd meenie 669 55 48ms 1 May 2021 723rd KatieLG 🇬🇧 669 55 40ms 3 May 2021 723rd olivermrose 🇺🇸 669 55 33ms 6 Nov 2021 723rd shinh 669 55 38ms 22 Jun 2022 723rd Andriamanitra 🇫🇮 669 55 50ms 17 Jul 2023 728th m42km 669 72 443ms 1 Feb 2024 729th voytxt 🇨🇿 667 55 129ms 3 Aug 2024 730th LeeCamp 666 77 23ms 23 Dec 2021 730th codewrite 🇬🇧 666 77 11ms 9 Jul 2025 732nd madex 🇩🇪 666 88 2ms 15 Jun 2023 732nd Alex-x90 🇺🇸 666 88 2ms 1 Oct 2023 734th janbehrens 🇩🇪 665 54 12ms 11 Jun 2021 735th Natanaelel 🇸🇪 664 81 142ms 7 Jul 2025 736th Natanaelel 🇸🇪 663 49 120ms 12 Feb 2023 737th elgan65536 662 118 151ms 30 Mar 2024 738th didion0 🇺🇸 661 62 9ms 6 May 2021 738th MeWhenI 🇻🇦 661 62 22ms 12 Jun 2021 740th snoozingnewt 🇨🇦 661 109 406ms 13 Oct 2025 741st annaproxy 659 110 341ms 29 Mar 2022 741st Matgc04 659 110 362ms 25 May 2023 741st Yewzir 🇧🇪 659 110 343ms 11 Feb 2024 744th janbehrens 🇩🇪 659 127 26ms 9 Jul 2021 745th NewDefectus 🇮🇱 658 47 2ms 19 Dec 2021 746th CatsAreFluffy 658 89 2ms 15 Jan 2023 747th Indivicivet 657 78 58ms 26 Oct 2021 747th SirFireball3521 657 78 16ms 14 Mar 2023 749th MeWhenI 🇻🇦 652 99 4,193ms 24 Oct 2024 750th Stockoh 🇫🇷 651 74 355ms 24 Jun 2024 751st raphaelimahorn 650 63 12ms 10 Aug 2021 752nd pascscha 649 79 16ms 28 Mar 2022 753rd scpchicken 🇵🇼 648 83 124ms 25 Feb 2023 754th kmathis22 648 118 578ms 23 Oct 2025 755th KatieLG 🇬🇧 647 37 35ms 20 Oct 2021 756th DialFrost 🇸🇬 647 71 30ms 28 Feb 2025 757th aliakseikalosha 647 112 331ms 21 Nov 2021 757th CaedenHarper 🇨🇦 647 112 366ms 17 Oct 2025 759th nephila-nacrea 🇬🇧 644 48 3ms 1 May 2021 759th JRaspass 🇬🇧 644 48 2ms 1 Sep 2021 759th Natanaelel 🇸🇪 644 48 2ms 26 Jan 2022 762nd Shanethegamer 🇺🇸 644 57 130ms 5 Aug 2024 763rd wirewolf010 644 91 2ms 12 Jan 2022 763rd Irratix 🇳🇱 644 91 1ms 13 Jun 2022 765th janbehrens 🇩🇪 642 66 449ms 1 Nov 2021 766th MeWhenI 🇻🇦 641 56 12ms 17 Nov 2023 767th jacklynnepenick 641 80 43ms 26 Aug 2021 767th b10011 🇫🇮 641 80 25ms 8 Jan 2023 767th keelimeguy 🇺🇸 641 80 1,998ms 19 Dec 2023 770th Sakisan 🇧🇪 641 84 160ms 30 May 2022 771st tomh1012 641 113 402ms 20 days ago 772nd cure-honey 🇯🇵 639 131 26ms 11 Jul 2021 773rd lynn 638 72 27ms 8 Sep 2021 774th mousetail 🇳🇱 637 33 4ms 18 Jan 2024 775th HumanoidCPU 637 113 426ms 27 Jun 2024 776th DialFrost 🇸🇬 635 94 21ms 27 Sep 2024 777th michelebastione 🇮🇹 633 81 21ms 26 May 2021 777th petroselo 633 81 37ms 12 Apr 2022 777th jhpaques 🇫🇷 633 81 53ms 29 Jul 2022 777th bwenstar 633 81 19ms 12 Aug 2022 777th glesnick 633 81 45ms 30 Sep 2022 777th eshilo-draper 633 81 11ms 27 Oct 2022 777th nstearns96 🇬🇧 633 81 53ms 29 Nov 2022 777th cingulataluke 633 81 13ms 29 Aug 2023 777th estomagordo 🇳🇱 633 81 10ms 31 Aug 2023 777th Ythaenagor 633 81 11ms 5 Aug 2024 787th annaproxy 633 85 155ms 30 Jan 2022 788th msbranicky 633 102 3,923ms 9 Jan 2025 789th Shanethegamer 🇺🇸 631 49 3ms 16 Sep 2021 790th 4hg 🇺🇸 630 38 130ms 28 Jan 2023 791st florton 630 65 9ms 7 Jan 2022 791st Garklein 🇨🇦 630 65 14ms 7 Jan 2022 791st xyangst 630 65 10ms 12 Oct 2024 794th Re-Adventures 🇮🇳 630 93 2ms 30 Dec 2021 794th Yewzir 🇧🇪 630 93 2ms 9 Feb 2024 796th janbehrens 🇩🇪 627 62 284ms 3 Dec 2023 797th emplv 🇱🇻 627 86 97ms 20 Dec 2022 798th snoozingnewt 🇨🇦 627 103 4,263ms 13 Oct 2025 799th Lydxn 🇨🇦 627 122 387ms 2 Feb 2022 800th RustemB 🇷🇺 625 82 14ms 2 May 2021 First Prev 721–800 of 1,786 Next Last