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 554th CutSandstone 752 72 35ms 5 Jul 2024 554th robin-scragg 752 72 11ms 24 Jul 2025 563rd jared-hughes 751 49 48ms 11 Sep 2022 564th MeWhenI 🇻🇦 749 57 8ms 29 Dec 2024 564th duckyluuk 🇳🇱 749 57 9ms 28 Jan 2025 566th hoosierEE 748 32 33ms 4 Feb 2022 566th scpchicken 🇵🇼 748 32 33ms 8 Jan 2023 568th SirBogman 🇺🇸 747 52 599ms 5 Jan 2024 569th schachmattmatt 745 55 9ms 26 Sep 2021 569th blaztoma 🇱🇹 745 55 10ms 25 Aug 2025 571st marshallward 🇺🇸 744 82 39ms 7 Jun 2021 571st cure-honey 🇯🇵 744 82 38ms 9 Jun 2021 573rd Shanethegamer 🇺🇸 743 97 435ms 1 Mar 2022 574th fredrik-bakke 🇳🇴 741 73 38ms 2 Oct 2022 574th fourth-bit 741 73 47ms 5 Dec 2022 574th QuincyNash 🇺🇸 741 73 51ms 5 Dec 2022 574th AlexanderFair 741 73 45ms 2 Jul 2023 574th HumanoidCPU 741 73 12ms 25 May 2024 574th NickTheEASDude 🇺🇸 741 73 48ms 6 Aug 2024 574th AtengChen 741 73 11ms 27 Aug 2024 574th andrewjc2000 741 73 47ms 18 Jul 2025 574th madeforlosers 741 73 11ms 13 Nov 2025 583rd albanian-laundromat 739 129 257ms 14 days ago 584th m-tkach 🇺🇦 736 50 45ms 12 Dec 2022 584th Natanaelel 🇸🇪 736 50 45ms 12 Feb 2023 586th ovs-code 🇩🇪 736 51 130ms 17 Nov 2024 587th MeWhenI 🇻🇦 736 72 110ms 28 Feb 2025 588th Steffan153 🇫🇮 736 73 10ms 3 Mar 2024 588th Shanethegamer 🇺🇸 736 73 48ms 8 Apr 2024 590th NewDefectus 🇮🇱 735 57 49ms 6 Dec 2021 591st Shanethegamer 🇺🇸 735 83 17ms 4 Oct 2024 592nd BlankSpruce 735 107 65ms 24 Sep 2024 593rd ovs-code 🇩🇪 734 86 5ms 21 Jul 2024 594th targrik 733 130 277ms 4 Jul 2025 594th snoozingnewt 🇨🇦 733 130 260ms 13 Oct 2025 596th MeWhenI 🇻🇦 732 54 903ms 12 May 2023 596th anter69 🇭🇺 732 54 958ms 24 Oct 2024 598th Waffle3z 732 56 9ms 1 May 2021 598th ArmaanAS 732 56 9ms 21 Jun 2021 598th LukeBridges 🇬🇧 732 56 10ms 30 Jan 2025 598th snoozingnewt 🇨🇦 732 56 9ms 13 Oct 2025 602nd SmartK8 🇨🇿 732 99 312ms 30 Oct 2022 603rd adoxography 731 74 46ms 20 Aug 2021 603rd m42km 731 74 11ms 25 Nov 2023 603rd Stockoh 🇫🇷 731 74 46ms 23 Jun 2024 603rd TheZwierzLF 🇵🇱 731 74 11ms 24 May 2025 607th snoozingnewt 🇨🇦 731 84 80ms 13 Oct 2025 608th Natanaelel 🇸🇪 728 28 3ms 20 Jul 2023 608th emgordon154 728 28 21ms 3 Nov 2024 608th lifthrasiir 🇰🇷 728 28 3ms 29 Nov 2024 611th primo-ppcg 🇹🇭 728 47 124ms 21 Jun 2021 612th Mikey-Beep 🇬🇧 728 67 26ms 6 Jun 2024 613th albanian-laundromat 728 78 24ms 15 Aug 2025 614th Alex-x90 🇺🇸 728 108 52ms 9 Dec 2022 614th CatsAreFluffy 728 108 62ms 16 Dec 2022 616th rboath 727 61 83ms 9 Jan 2025 617th edsrzf 🇳🇿 727 84 19ms 4 days ago 618th snoozingnewt 🇨🇦 726 82 2ms 13 Oct 2025 619th MeWhenI 🇻🇦 724 67 2ms 22 Jul 2024 620th potato-jackson 722 75 15ms 10 Sep 2021 620th osmith93 722 75 20ms 14 Jun 2022 620th aksyristos 722 75 43ms 18 Jan 2023 620th celiendonze 🇨🇭 722 75 11ms 11 Apr 2023 620th programjames 722 75 42ms 3 Feb 2024 620th bob-th 722 75 28ms 26 Jul 2024 620th fkantelberg 722 75 38ms 22 Jul 2025 627th eranws 719 57 9ms 9 Sep 2022 627th iczelia 🇩🇪 719 57 10ms 11 Oct 2025 629th stefangimmillaro 719 75 98ms 25 Jun 2023 630th KatieLG 🇬🇧 718 67 409ms 1 Oct 2025 630th albanian-laundromat 718 67 360ms 23 Oct 2025 632nd inventshah 718 131 93ms 9 Sep 2022 633rd cure-honey 🇯🇵 717 109 128ms 11 Jul 2021 633rd mousetail 🇳🇱 717 109 120ms 18 Jan 2024 635th scpchicken 🇵🇼 713 48 755ms 8 Jan 2023 636th 77Tigers 712 76 44ms 27 May 2021 636th kyleclaassen 712 76 21ms 9 Feb 2022 636th za3k 712 76 15ms 16 Oct 2022 636th cros107 🇦🇺 712 76 45ms 6 Aug 2023 636th elgan65536 712 76 50ms 7 Apr 2024 First Prev 561–640 of 1,805 Next Last