The Calendar hole will go live in approximately 27 hours. 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 Shanethegamer 🇺🇸 672 117 62ms 28 Dec 2022 722nd rucin93 🇵🇱 671 114 540ms 24 Sep 2025 723rd Skwerl23 670 58 329ms 6 Feb 2023 724th MeWhenI 🇻🇦 670 68 699ms 15 Sep 2025 725th meenie 669 55 42ms 1 May 2021 725th KatieLG 🇬🇧 669 55 43ms 3 May 2021 725th olivermrose 🇺🇸 669 55 50ms 6 Nov 2021 725th shinh 669 55 48ms 22 Jun 2022 725th Andriamanitra 🇫🇮 669 55 49ms 17 Jul 2023 730th m42km 669 72 443ms 1 Feb 2024 731st voytxt 🇨🇿 667 55 129ms 3 Aug 2024 732nd janbehrens 🇩🇪 666 54 12ms 11 Jun 2021 733rd LeeCamp 666 77 23ms 23 Dec 2021 733rd codewrite 🇬🇧 666 77 11ms 9 Jul 2025 735th madex 🇩🇪 666 88 2ms 15 Jun 2023 735th Alex-x90 🇺🇸 666 88 2ms 1 Oct 2023 737th Natanaelel 🇸🇪 664 81 142ms 7 Jul 2025 738th Natanaelel 🇸🇪 663 49 109ms 12 Feb 2023 739th elgan65536 662 118 151ms 30 Mar 2024 740th didion0 🇺🇸 661 62 9ms 6 May 2021 740th MeWhenI 🇻🇦 661 62 22ms 12 Jun 2021 742nd snoozingnewt 🇨🇦 661 109 406ms 13 Oct 2025 743rd annaproxy 659 110 341ms 29 Mar 2022 743rd Matgc04 659 110 362ms 25 May 2023 743rd Yewzir 🇧🇪 659 110 343ms 11 Feb 2024 746th janbehrens 🇩🇪 659 127 26ms 9 Jul 2021 747th NewDefectus 🇮🇱 658 47 2ms 19 Dec 2021 748th CatsAreFluffy 658 89 2ms 15 Jan 2023 749th Indivicivet 657 78 58ms 26 Oct 2021 749th SirFireball3521 657 78 16ms 14 Mar 2023 751st MeWhenI 🇻🇦 652 99 3,165ms 24 Oct 2024 752nd Stockoh 🇫🇷 651 74 355ms 24 Jun 2024 753rd raphaelimahorn 650 63 12ms 10 Aug 2021 754th pascscha 649 79 16ms 28 Mar 2022 755th scpchicken 🇵🇼 648 83 124ms 25 Feb 2023 756th kmathis22 648 118 578ms 23 Oct 2025 757th KatieLG 🇬🇧 647 37 35ms 20 Oct 2021 758th DialFrost 🇸🇬 647 71 30ms 28 Feb 2025 759th aliakseikalosha 647 112 331ms 21 Nov 2021 759th CaedenHarper 🇨🇦 647 112 351ms 17 Oct 2025 761st nephila-nacrea 🇬🇧 644 48 3ms 1 May 2021 761st JRaspass 🇬🇧 644 48 2ms 1 Sep 2021 761st Natanaelel 🇸🇪 644 48 2ms 26 Jan 2022 764th Shanethegamer 🇺🇸 644 57 130ms 5 Aug 2024 765th wirewolf010 644 91 2ms 12 Jan 2022 765th Irratix 🇳🇱 644 91 1ms 13 Jun 2022 767th MeWhenI 🇻🇦 642 56 10ms 17 Nov 2023 768th janbehrens 🇩🇪 642 66 401ms 1 Nov 2021 769th jacklynnepenick 641 80 43ms 26 Aug 2021 769th b10011 🇫🇮 641 80 25ms 8 Jan 2023 769th keelimeguy 🇺🇸 641 80 1,998ms 19 Dec 2023 772nd Sakisan 🇧🇪 641 84 160ms 30 May 2022 773rd tomh1012 641 113 402ms 28 Nov 2025 774th cure-honey 🇯🇵 639 131 26ms 11 Jul 2021 775th lynn 638 72 27ms 8 Sep 2021 776th mousetail 🇳🇱 637 33 4ms 18 Jan 2024 777th HumanoidCPU 637 113 426ms 27 Jun 2024 778th DialFrost 🇸🇬 635 94 21ms 27 Sep 2024 779th michelebastione 🇮🇹 633 81 21ms 26 May 2021 779th petroselo 633 81 37ms 12 Apr 2022 779th jhpaques 🇫🇷 633 81 53ms 29 Jul 2022 779th bwenstar 633 81 19ms 12 Aug 2022 779th glesnick 633 81 45ms 30 Sep 2022 779th eshilo-draper 633 81 11ms 27 Oct 2022 779th nstearns96 🇬🇧 633 81 53ms 29 Nov 2022 779th cingulataluke 633 81 13ms 29 Aug 2023 779th estomagordo 🇳🇱 633 81 10ms 31 Aug 2023 779th Ythaenagor 633 81 11ms 5 Aug 2024 789th annaproxy 633 85 155ms 30 Jan 2022 790th msbranicky 633 102 3,786ms 9 Jan 2025 791st Shanethegamer 🇺🇸 631 49 3ms 16 Sep 2021 792nd 4hg 🇺🇸 630 38 130ms 28 Jan 2023 793rd florton 630 65 9ms 7 Jan 2022 793rd Garklein 🇨🇦 630 65 14ms 7 Jan 2022 793rd xyangst 630 65 10ms 12 Oct 2024 796th Re-Adventures 🇮🇳 630 93 2ms 30 Dec 2021 796th Yewzir 🇧🇪 630 93 2ms 9 Feb 2024 798th janbehrens 🇩🇪 627 62 284ms 3 Dec 2023 799th emplv 🇱🇻 627 86 97ms 20 Dec 2022 800th snoozingnewt 🇨🇦 627 103 3,335ms 13 Oct 2025 First Prev 721–800 of 1,789 Next Last