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 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 481st Shanethegamer 🇺🇸 791 50 913ms 15 Dec 2022 482nd primo-ppcg 🇹🇭 791 87 1,271ms 30 Nov 2021 483rd DialFrost 🇸🇬 791 91 378ms 16 Nov 2025 484th Fishron 789 65 59ms 19 Oct 2021 484th hellwue 789 65 11ms 2 Mar 2022 484th suwat513 789 65 11ms 18 Jun 2023 484th 2011-Chan-Ethan 789 65 66ms 9 Jul 2023 484th mikehanus 789 65 37ms 5 Dec 2023 484th mathisfun271 789 65 11ms 12 Feb 2024 484th InigoK 🇺🇸 789 65 57ms 26 Aug 2025 491st Shanethegamer 🇺🇸 788 52 9ms 24 May 2021 491st helbling 🇨🇭 788 52 9ms 27 May 2024 491st DialFrost 🇸🇬 788 52 9ms 16 Nov 2025 494th KatieLG 🇬🇧 788 78 94ms 14 Jan 2023 495th tailorspy 786 100 75ms 29 Oct 2023 496th JayXon 🇺🇸 785 54 377ms 20 Jun 2021 497th GrayJoKing 🇦🇺 784 101 27ms 28 Jun 2023 498th GolfingSuccess 🇬🇷 784 183 473ms 12 days ago 499th MeWhenI 🇻🇦 783 92 438ms 16 Mar 2022 500th SirBogman 🇺🇸 782 47 38ms 26 Nov 2021 501st Shanethegamer 🇺🇸 782 60 74ms 5 Dec 2024 502nd GolfingSuccess 🇬🇷 781 75 2ms 1 May 2021 502nd MeWhenI 🇻🇦 781 75 2ms 15 Mar 2022 504th MeWhenI 🇻🇦 780 85 10ms 20 Jul 2023 505th sean-niemann 🇺🇸 780 121 269ms 8 Jun 2025 506th janbehrens 🇩🇪 779 93 319ms 21 Nov 2021 507th Alessandro-Balconi 🇮🇹 778 57 95ms 9 Jul 2023 508th Shanethegamer 🇺🇸 778 73 19ms 10 Sep 2022 509th emgordon154 778 83 4,246ms 14 Jul 2025 510th Waffle3z 777 66 10ms 1 May 2021 510th NewDefectus 🇮🇱 777 66 11ms 3 May 2021 510th betaveros 777 66 47ms 1 Jan 2023 510th elgan65536 777 66 65ms 31 Mar 2024 510th stertooy 🇧🇪 777 66 23ms 18 Jun 2024 510th Bmrl7 777 66 18ms 31 Aug 2025 516th HumanoidCPU 776 62 393ms 25 May 2024 517th Shanethegamer 🇺🇸 774 122 262ms 7 Feb 2024 517th CaedenHarper 🇨🇦 774 122 284ms 14 days ago 519th coreynash 773 53 9ms 14 Mar 2024 520th h3ra993huskp 🇯🇵 773 99 478ms 18 days ago 521st edsrzf 🇳🇿 772 90 42ms 30 Dec 2024 522nd Yewzir 🇧🇪 772 176 2,524ms 14 Nov 2025 523rd ovs-code 🇩🇪 770 61 73ms 23 Sep 2023 524th xnor-gate 769 70 140ms 11 Oct 2022 524th TrueBoxGuy 769 70 1,322ms 24 Jul 2023 526th inventshah 768 74 20ms 11 Sep 2022 527th edsrzf 🇳🇿 767 70 8ms 14 Dec 2024 528th janbehrens 🇩🇪 766 94 465ms 24 Mar 2022 529th adgh 🇬🇧 765 58 96ms 8 Jan 2025 530th jakobkordez 🇸🇮 765 67 22ms 19 Oct 2022 530th Artemis21 🇬🇧 765 67 28ms 21 Jan 2025 530th shelerr 765 67 43ms 22 Aug 2025 533rd Shanethegamer 🇺🇸 764 86 116ms 7 Nov 2025 534th JDiLenarda 🇫🇷 764 90 1,299ms 17 Nov 2023 535th MeWhenI 🇻🇦 763 188 451ms 28 Mar 2025 536th SirBogman 🇺🇸 762 80 40ms 8 Dec 2021 537th UnderKoen 🇳🇱 762 107 25ms 5 Dec 2024 538th f-tucker 761 77 2ms 8 Jan 2024 539th snoozingnewt 🇨🇦 760 60 706ms 13 Oct 2025 540th DayDun 🇸🇪 759 54 9ms 24 Jan 2023 540th CaedenHarper 🇨🇦 759 54 9ms 23 Aug 2025 542nd stefangimmillaro 759 85 3,771ms 28 Oct 2024 543rd DialFrost 🇸🇬 757 51 2ms 3 days ago 544th janbehrens 🇩🇪 756 48 6ms 7 Jun 2021 545th knutae 🇳🇴 754 68 20ms 16 Jul 2021 545th rowboat1 754 68 41ms 24 Jun 2022 545th FortuiteMan 🇫🇷 754 68 50ms 20 Aug 2023 545th Glinte 754 68 11ms 14 Dec 2023 545th logvp 754 68 42ms 10 Jan 2024 545th Bulmenisaurus 754 68 39ms 23 Oct 2024 545th dokutan 754 68 15ms 12 Feb 2025 552nd MeWhenI 🇻🇦 753 81 38ms 31 Dec 2023 553rd SirBogman 🇺🇸 752 64 646ms 16 Jan 2024 553rd AlephSquirrel 752 64 422ms 16 Jan 2024 553rd msbranicky 752 64 688ms 16 Jan 2024 556th MeWhenI 🇻🇦 751 28 4ms 14 Feb 2025 557th jared-hughes 751 49 48ms 11 Sep 2022 558th MeWhenI 🇻🇦 749 57 8ms 29 Dec 2024 558th duckyluuk 🇳🇱 749 57 9ms 28 Jan 2025 560th janbehrens 🇩🇪 749 126 275ms 20 Jun 2021 First Prev 481–560 of 1,786 Next Last