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 401st stefangimmillaro 835 73 43ms 21 Jun 2023 402nd HPWiz 🇳🇿 833 53 444ms 21 Jun 2021 403rd GrayJoKing 🇦🇺 833 61 30ms 18 Aug 2023 404th suwat513 833 65 11ms 18 Jun 2023 404th mikehanus 833 65 37ms 5 Dec 2023 404th mathisfun271 833 65 11ms 12 Feb 2024 404th InigoK 🇺🇸 833 65 57ms 26 Aug 2025 408th tomtheisen 🇺🇸 833 87 317ms 21 Nov 2021 409th sean-niemann 🇺🇸 832 93 460ms 26 Sep 2025 410th sean-niemann 🇺🇸 830 75 41ms 26 Apr 2025 411th lynn 829 83 1,381ms 13 Sep 2021 412th Shanethegamer 🇺🇸 828 64 99ms 24 May 2021 413th GolfingSuccess 🇬🇷 828 95 59ms 2 Jan 2022 414th prplz 🇦🇺 826 72 2ms 1 May 2021 414th NewDefectus 🇮🇱 826 72 2ms 3 May 2021 414th 09cf 826 72 2ms 31 Aug 2023 414th AZTECCO 826 72 2ms 16 Sep 2025 418th lynn 825 29 35ms 1 May 2021 419th error256 824 57 63ms 13 Sep 2024 420th stefangimmillaro 823 88 342ms 5 May 2023 421st MeWhenI 🇻🇦 823 94 528ms 7 Nov 2025 422nd stefangimmillaro 823 95 129ms 28 May 2024 423rd Lydxn 🇨🇦 822 54 106ms 28 Jun 2023 424th neihousaigaai 820 50 9ms 3 May 2021 424th uttumuttu 🇫🇮 820 50 9ms 8 Jan 2022 424th jared-hughes 820 50 9ms 6 Apr 2022 424th janbehrens 🇩🇪 820 50 9ms 31 May 2022 424th inventshah 820 50 9ms 15 Nov 2022 424th Maznek 820 50 9ms 28 Jun 2023 424th voytxt 🇨🇿 820 50 10ms 11 Jul 2024 424th Lv0Sys 🇵🇱 820 50 10ms 13 days ago 432nd Waffle3z 820 66 10ms 1 May 2021 432nd NewDefectus 🇮🇱 820 66 11ms 3 May 2021 432nd betaveros 820 66 47ms 1 Jan 2023 432nd stertooy 🇧🇪 820 66 23ms 18 Jun 2024 432nd Bmrl7 820 66 18ms 31 Aug 2025 437th albanian-laundromat 820 76 42ms 6 Sep 2025 438th typeswitch-dev 🇵🇹 818 81 5ms 4 Aug 2023 439th ovs-code 🇩🇪 818 88 452ms 14 Mar 2022 440th primo-ppcg 🇹🇭 817 64 136ms 6 Aug 2024 441st GrayJoKing 🇦🇺 817 66 95ms 6 Feb 2023 441st sean-niemann 🇺🇸 817 66 98ms 19 Jul 2024 443rd Argeento 🇵🇱 816 46 127ms 3 Aug 2024 444th lifthrasiir 🇰🇷 816 59 358ms 2 Dec 2024 445th SirBogman 🇺🇸 815 42 1,023ms 9 Apr 2022 446th primo-ppcg 🇹🇭 815 65 112ms 11 Jul 2022 447th nwellnhof 🇩🇪 814 38 9ms 14 Oct 2021 447th Steffan153 🇫🇮 814 38 3ms 29 Aug 2024 447th saito-ta 🇯🇵 814 38 2ms 4 Aug 2025 450th edsrzf 🇳🇿 814 56 777ms 4 Sep 2025 450th CaedenHarper 🇨🇦 814 56 738ms 2 Oct 2025 450th albanian-laundromat 814 56 732ms 4 Nov 2025 453rd Yax42 🇫🇷 814 89 377ms 16 Aug 2025 454th primo-ppcg 🇹🇭 813 103 25ms 10 May 2023 455th dcgjb 810 48 464ms 22 Feb 2024 455th Steffan153 🇫🇮 810 48 342ms 9 Aug 2024 457th GrayJoKing 🇦🇺 809 61 8ms 11 Oct 2023 458th Steffan153 🇫🇮 809 89 393ms 23 Jul 2024 458th sean-niemann 🇺🇸 809 89 459ms 2 Jan 2025 460th shelerr 808 67 43ms 22 Aug 2025 460th KatieLG 🇬🇧 808 67 42ms 1 Oct 2025 462nd emgordon154 807 49 1,096ms 27 Nov 2024 463rd inventshah 807 80 4,010ms 12 Nov 2024 464th primo-ppcg 🇹🇭 806 63 5ms 16 Aug 2023 465th prplz 🇦🇺 805 90 322ms 21 Nov 2021 465th MeWhenI 🇻🇦 805 90 347ms 8 Dec 2022 465th sean-niemann 🇺🇸 805 90 382ms 2 Jan 2025 468th janbehrens 🇩🇪 804 74 2ms 1 May 2021 468th luuumine 🇫🇷 804 74 2ms 7 Nov 2025 470th emgordon154 804 169 1,740ms 16 Sep 2025 471st tayloia 🇬🇧 803 51 9ms 18 May 2023 472nd JayXon 🇺🇸 803 55 282ms 20 Jun 2021 473rd MeWhenI 🇻🇦 802 60 399ms 29 Apr 2025 474th MeWhenI 🇻🇦 801 119 302ms 9 Feb 2023 475th Waffle3z 800 46 34ms 1 May 2021 475th Shanethegamer 🇺🇸 800 46 60ms 15 Dec 2022 477th lynn 800 99 31ms 18 Jul 2023 477th Steffan153 🇫🇮 800 99 29ms 25 Aug 2024 479th Shanethegamer 🇺🇸 797 81 3,828ms 24 Oct 2024 480th knutae 🇳🇴 796 68 20ms 16 Jul 2021 First Prev 401–480 of 1,805 Next Last