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 561st hoosierEE 748 32 33ms 4 Feb 2022 561st scpchicken 🇵🇼 748 32 33ms 8 Jan 2023 563rd SirBogman 🇺🇸 747 52 599ms 5 Jan 2024 564th schachmattmatt 745 55 9ms 26 Sep 2021 564th blaztoma 🇱🇹 745 55 10ms 25 Aug 2025 566th antimon2 🇯🇵 744 57 342ms 29 Oct 2022 567th marshallward 🇺🇸 744 82 39ms 7 Jun 2021 567th cure-honey 🇯🇵 744 82 38ms 9 Jun 2021 569th scpchicken 🇵🇼 743 69 13ms 25 Feb 2023 569th jatloe 743 69 42ms 27 Sep 2024 571st Shanethegamer 🇺🇸 743 97 435ms 1 Mar 2022 572nd sisyphus-ppcg 🇦🇺 739 44 812ms 2 Mar 2022 573rd m-tkach 🇺🇦 736 50 45ms 12 Dec 2022 573rd Natanaelel 🇸🇪 736 50 45ms 12 Feb 2023 575th MeWhenI 🇻🇦 736 72 110ms 28 Feb 2025 576th Steffan153 🇫🇮 736 73 10ms 3 Mar 2024 576th Shanethegamer 🇺🇸 736 73 48ms 8 Apr 2024 578th Shanethegamer 🇺🇸 735 83 17ms 4 Oct 2024 579th BlankSpruce 735 107 65ms 24 Sep 2024 580th MeWhenI 🇻🇦 732 54 903ms 12 May 2023 580th anter69 🇭🇺 732 54 958ms 24 Oct 2024 582nd Waffle3z 732 56 9ms 1 May 2021 582nd ArmaanAS 732 56 9ms 21 Jun 2021 582nd LukeBridges 🇬🇧 732 56 10ms 30 Jan 2025 582nd snoozingnewt 🇨🇦 732 56 9ms 13 Oct 2025 586th mokymok 🇺🇸 732 70 11ms 23 Jul 2021 586th Anonymousellama21 732 70 12ms 15 Jun 2022 586th andre-lameirinhas 🇵🇹 732 70 11ms 27 Aug 2022 586th 051 🇸🇬 732 70 45ms 30 Aug 2022 586th IshanPanpaliya 732 70 11ms 19 Oct 2022 586th ahmetdemirag 🇨🇾 732 70 10ms 12 Jun 2024 586th JunkIce 732 70 24ms 3 Dec 2024 586th croc54 732 70 10ms 17 Jan 2025 594th SmartK8 🇨🇿 732 99 312ms 30 Oct 2022 595th albanian-laundromat 732 129 257ms 14 days ago 596th snoozingnewt 🇨🇦 731 84 80ms 13 Oct 2025 597th Natanaelel 🇸🇪 728 28 3ms 20 Jul 2023 597th emgordon154 728 28 21ms 3 Nov 2024 597th lifthrasiir 🇰🇷 728 28 3ms 29 Nov 2024 600th Mikey-Beep 🇬🇧 728 67 26ms 6 Jun 2024 601st albanian-laundromat 728 78 24ms 15 Aug 2025 602nd Alex-x90 🇺🇸 728 108 52ms 9 Dec 2022 602nd CatsAreFluffy 728 108 62ms 16 Dec 2022 604th rboath 727 61 83ms 9 Jan 2025 605th edsrzf 🇳🇿 727 84 19ms 4 days ago 606th targrik 726 130 277ms 4 Jul 2025 606th snoozingnewt 🇨🇦 726 130 260ms 13 Oct 2025 608th DialFrost 🇸🇬 725 33 34ms 27 Jan 2023 609th MeWhenI 🇻🇦 724 67 2ms 22 Jul 2024 610th primo-ppcg 🇹🇭 722 45 124ms 21 Jun 2021 611th Drew-j-Smith 722 71 42ms 19 Apr 2022 611th commandblockguy 🇺🇸 722 71 16ms 22 Sep 2022 613th ovs-code 🇩🇪 719 51 130ms 17 Nov 2024 614th eranws 719 57 9ms 9 Sep 2022 614th iczelia 🇩🇪 719 57 10ms 11 Oct 2025 616th stefangimmillaro 719 75 98ms 25 Jun 2023 617th albanian-laundromat 718 67 360ms 23 Oct 2025 618th inventshah 718 131 93ms 9 Sep 2022 619th albanian-laundromat 717 77 153ms 20 Nov 2025 620th cure-honey 🇯🇵 717 109 128ms 11 Jul 2021 620th mousetail 🇳🇱 717 109 120ms 18 Jan 2024 622nd snoozingnewt 🇨🇦 715 82 2ms 13 Oct 2025 623rd mauro-1 🇮🇹 712 72 17ms 18 Aug 2021 623rd PiterAnnema 712 72 37ms 23 Mar 2022 623rd Andrey135296 712 72 11ms 4 Apr 2022 623rd TaserTheFox 🇺🇸 712 72 11ms 27 Jan 2023 623rd Fracture17 712 72 41ms 13 Apr 2023 623rd WillConker 712 72 48ms 10 Mar 2024 623rd jipsong 🇩🇪 712 72 18ms 10 Jun 2024 623rd CutSandstone 712 72 35ms 5 Jul 2024 631st sean-niemann 🇺🇸 710 110 121ms 9 Jun 2025 632nd emplv 🇱🇻 709 118 26ms 29 Jun 2022 633rd dokutan 708 68 386ms 12 Feb 2025 634th rak1507 🇬🇧 708 76 137ms 29 Jun 2021 634th GrayJoKing 🇦🇺 708 76 130ms 14 Mar 2022 636th Irratix 🇳🇱 708 111 64ms 3 Jan 2022 636th Yewzir 🇧🇪 708 111 91ms 11 Feb 2024 638th emgordon154 707 52 53ms 27 Nov 2024 638th olleicua 🇺🇸 707 52 43ms 25 Feb 2025 638th codereport 🇨🇦 707 52 37ms 21 Apr 2025 First Prev 561–640 of 1,786 Next Last