The Calendar hole will go live in approximately 2 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 Natanaelel 🇸🇪 671 51 109ms 12 Feb 2023 722nd Skwerl23 670 58 329ms 6 Feb 2023 723rd MeWhenI 🇻🇦 670 68 699ms 15 Sep 2025 724th meenie 669 55 42ms 1 May 2021 724th KatieLG 🇬🇧 669 55 43ms 3 May 2021 724th shinh 669 55 48ms 22 Jun 2022 724th Andriamanitra 🇫🇮 669 55 49ms 17 Jul 2023 728th janbehrens 🇩🇪 669 66 401ms 1 Nov 2021 729th m42km 669 72 443ms 1 Feb 2024 730th Alex-x90 🇺🇸 669 89 2ms 9 Dec 2022 730th CatsAreFluffy 669 89 2ms 15 Jan 2023 730th madex 🇩🇪 669 89 3ms 15 Jun 2023 733rd michelebastione 🇮🇹 668 81 21ms 26 May 2021 733rd mokymok 🇺🇸 668 81 10ms 17 Nov 2021 733rd petroselo 668 81 37ms 12 Apr 2022 733rd jhpaques 🇫🇷 668 81 53ms 29 Jul 2022 733rd glesnick 668 81 45ms 30 Sep 2022 733rd eshilo-draper 668 81 11ms 27 Oct 2022 733rd nstearns96 🇬🇧 668 81 53ms 29 Nov 2022 733rd estomagordo 🇳🇱 668 81 10ms 31 Aug 2023 733rd Ythaenagor 668 81 11ms 5 Aug 2024 742nd janbehrens 🇩🇪 666 54 12ms 11 Jun 2021 743rd Natanaelel 🇸🇪 664 81 142ms 7 Jul 2025 744th elgan65536 662 118 151ms 30 Mar 2024 745th didion0 🇺🇸 661 62 9ms 6 May 2021 745th MeWhenI 🇻🇦 661 62 22ms 12 Jun 2021 747th snoozingnewt 🇨🇦 661 109 406ms 13 Oct 2025 748th RustemB 🇷🇺 660 82 14ms 2 May 2021 748th Mikey-Beep 🇬🇧 660 82 15ms 5 Sep 2024 748th moustave 660 82 57ms 28 Nov 2024 748th klixel 🇨🇦 660 82 32ms 25 Jan 2025 748th AstroOrbis 660 82 11ms 25 Nov 2025 753rd Shanethegamer 🇺🇸 659 57 130ms 5 Aug 2024 754th annaproxy 659 110 341ms 29 Mar 2022 755th janbehrens 🇩🇪 659 127 26ms 9 Jul 2021 756th NewDefectus 🇮🇱 658 47 2ms 19 Dec 2021 757th olivermrose 🇺🇸 657 56 42ms 11 Nov 2021 758th kmathis22 656 118 578ms 23 Oct 2025 759th wirewolf010 654 91 2ms 12 Jan 2022 760th Matgc04 653 111 362ms 25 May 2023 760th Yewzir 🇧🇪 653 111 343ms 11 Feb 2024 762nd trist224 🇫🇷 652 83 39ms 1 Sep 2022 762nd jakobkordez 🇸🇮 652 83 22ms 19 Oct 2022 762nd Artemis21 🇬🇧 652 83 25ms 21 Jan 2025 765th MeWhenI 🇻🇦 652 99 3,165ms 24 Oct 2024 766th Stockoh 🇫🇷 651 74 355ms 24 Jun 2024 767th raphaelimahorn 650 63 12ms 10 Aug 2021 768th scpchicken 🇵🇼 648 83 124ms 25 Feb 2023 769th KatieLG 🇬🇧 647 37 35ms 20 Oct 2021 770th DialFrost 🇸🇬 647 71 30ms 28 Feb 2025 771st Irratix 🇳🇱 647 92 2ms 13 Mar 2022 772nd aliakseikalosha 647 112 331ms 21 Nov 2021 772nd CaedenHarper 🇨🇦 647 112 351ms 17 Oct 2025 774th nephila-nacrea 🇬🇧 644 48 3ms 1 May 2021 774th JRaspass 🇬🇧 644 48 2ms 1 Sep 2021 774th Natanaelel 🇸🇪 644 48 2ms 26 Jan 2022 777th ValdeQwerty 644 84 49ms 22 Sep 2021 777th PhysicDev 🇫🇷 644 84 24ms 13 Nov 2021 777th fgrosshans 🇫🇷 644 84 59ms 25 Jan 2022 777th amollberg 🇸🇪 644 84 14ms 30 Jan 2022 777th argusdusty 🇺🇸 644 84 59ms 21 Aug 2022 777th rollershutter 644 84 20ms 14 Nov 2023 777th Mabeloid 🇳🇴 644 84 13ms 6 Oct 2024 777th 5quiwyrm 644 84 58ms 7 Dec 2024 777th Alex-Huggett 🇬🇧 644 84 43ms 13 Sep 2025 786th mousetail 🇳🇱 643 34 4ms 18 Jan 2024 787th MeWhenI 🇻🇦 642 56 10ms 17 Nov 2023 788th Sakisan 🇧🇪 641 84 160ms 30 May 2022 789th tomh1012 641 113 402ms 28 Nov 2025 790th Lv0Sys 🇵🇱 640 69 329ms 24 days ago 791st Re-Adventures 🇮🇳 640 93 2ms 30 Dec 2021 792nd cure-honey 🇯🇵 639 131 26ms 11 Jul 2021 793rd lynn 638 72 27ms 8 Sep 2021 794th Bonjour27891 🇻🇳 637 85 46ms 30 Jan 2022 794th rowboat1 637 85 43ms 24 Jun 2022 796th HumanoidCPU 637 113 426ms 27 Jun 2024 797th CatsAreFluffy 636 66 51ms 31 Jan 2023 798th annaproxy 633 85 155ms 30 Jan 2022 799th Yewzir 🇧🇪 633 94 2ms 9 Feb 2024 800th msbranicky 633 102 3,786ms 9 Jan 2025 First Prev 721–800 of 1,808 Next Last