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 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 shinh 669 55 38ms 22 Jun 2022 723rd Andriamanitra 🇫🇮 669 55 50ms 17 Jul 2023 727th janbehrens 🇩🇪 669 66 449ms 1 Nov 2021 728th m42km 669 72 443ms 1 Feb 2024 729th Alex-x90 🇺🇸 669 89 2ms 9 Dec 2022 729th CatsAreFluffy 669 89 2ms 15 Jan 2023 729th madex 🇩🇪 669 89 3ms 15 Jun 2023 732nd michelebastione 🇮🇹 668 81 21ms 26 May 2021 732nd mokymok 🇺🇸 668 81 10ms 17 Nov 2021 732nd petroselo 668 81 37ms 12 Apr 2022 732nd jhpaques 🇫🇷 668 81 53ms 29 Jul 2022 732nd glesnick 668 81 45ms 30 Sep 2022 732nd eshilo-draper 668 81 11ms 27 Oct 2022 732nd nstearns96 🇬🇧 668 81 53ms 29 Nov 2022 732nd estomagordo 🇳🇱 668 81 10ms 31 Aug 2023 732nd Ythaenagor 668 81 11ms 5 Aug 2024 741st janbehrens 🇩🇪 665 54 12ms 11 Jun 2021 742nd Natanaelel 🇸🇪 664 81 142ms 7 Jul 2025 743rd elgan65536 662 118 151ms 30 Mar 2024 744th didion0 🇺🇸 661 62 9ms 6 May 2021 744th MeWhenI 🇻🇦 661 62 22ms 12 Jun 2021 746th snoozingnewt 🇨🇦 661 109 406ms 13 Oct 2025 747th RustemB 🇷🇺 660 82 14ms 2 May 2021 747th Mikey-Beep 🇬🇧 660 82 15ms 5 Sep 2024 747th moustave 660 82 57ms 28 Nov 2024 747th klixel 🇨🇦 660 82 32ms 25 Jan 2025 747th AstroOrbis 660 82 11ms 23 days ago 752nd Shanethegamer 🇺🇸 659 57 130ms 5 Aug 2024 753rd annaproxy 659 110 341ms 29 Mar 2022 754th janbehrens 🇩🇪 659 127 26ms 9 Jul 2021 755th NewDefectus 🇮🇱 658 47 2ms 19 Dec 2021 756th olivermrose 🇺🇸 657 56 34ms 11 Nov 2021 757th kmathis22 656 118 578ms 23 Oct 2025 758th wirewolf010 654 91 2ms 12 Jan 2022 759th Matgc04 653 111 362ms 25 May 2023 759th Yewzir 🇧🇪 653 111 343ms 11 Feb 2024 761st trist224 🇫🇷 652 83 39ms 1 Sep 2022 761st jakobkordez 🇸🇮 652 83 22ms 19 Oct 2022 761st Artemis21 🇬🇧 652 83 25ms 21 Jan 2025 764th MeWhenI 🇻🇦 652 99 4,193ms 24 Oct 2024 765th Stockoh 🇫🇷 651 74 355ms 24 Jun 2024 766th raphaelimahorn 650 63 12ms 10 Aug 2021 767th scpchicken 🇵🇼 648 83 124ms 25 Feb 2023 768th KatieLG 🇬🇧 647 37 35ms 20 Oct 2021 769th DialFrost 🇸🇬 647 71 30ms 28 Feb 2025 770th Irratix 🇳🇱 647 92 2ms 13 Mar 2022 771st aliakseikalosha 647 112 331ms 21 Nov 2021 771st CaedenHarper 🇨🇦 647 112 366ms 17 Oct 2025 773rd nephila-nacrea 🇬🇧 644 48 3ms 1 May 2021 773rd JRaspass 🇬🇧 644 48 2ms 1 Sep 2021 773rd Natanaelel 🇸🇪 644 48 2ms 26 Jan 2022 776th ValdeQwerty 644 84 49ms 22 Sep 2021 776th PhysicDev 🇫🇷 644 84 24ms 13 Nov 2021 776th fgrosshans 🇫🇷 644 84 59ms 25 Jan 2022 776th amollberg 🇸🇪 644 84 14ms 30 Jan 2022 776th argusdusty 🇺🇸 644 84 59ms 21 Aug 2022 776th rollershutter 644 84 20ms 14 Nov 2023 776th Mabeloid 🇳🇴 644 84 13ms 6 Oct 2024 776th 5quiwyrm 644 84 58ms 7 Dec 2024 776th Alex-Huggett 🇬🇧 644 84 43ms 13 Sep 2025 785th mousetail 🇳🇱 643 34 4ms 18 Jan 2024 786th MeWhenI 🇻🇦 641 56 12ms 17 Nov 2023 787th Sakisan 🇧🇪 641 84 160ms 30 May 2022 788th tomh1012 641 113 402ms 20 days ago 789th Lv0Sys 🇵🇱 640 69 352ms 13 days ago 790th Re-Adventures 🇮🇳 640 93 2ms 30 Dec 2021 791st cure-honey 🇯🇵 639 131 26ms 11 Jul 2021 792nd lynn 638 72 27ms 8 Sep 2021 793rd Bonjour27891 🇻🇳 637 85 46ms 30 Jan 2022 793rd rowboat1 637 85 43ms 24 Jun 2022 795th HumanoidCPU 637 113 426ms 27 Jun 2024 796th CatsAreFluffy 635 66 51ms 31 Jan 2023 797th annaproxy 633 85 155ms 30 Jan 2022 798th Yewzir 🇧🇪 633 94 2ms 9 Feb 2024 799th msbranicky 633 102 3,923ms 9 Jan 2025 800th Shanethegamer 🇺🇸 631 49 3ms 16 Sep 2021 First Prev 721–800 of 1,805 Next Last