The Calendar hole will go live in approximately 30 hours. 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 555th jipsong 🇩🇪 752 72 18ms 10 Jun 2024 555th CutSandstone 752 72 35ms 5 Jul 2024 555th robin-scragg 752 72 11ms 24 Jul 2025 564th jared-hughes 751 49 42ms 11 Sep 2022 565th MeWhenI 🇻🇦 749 57 8ms 29 Dec 2024 565th duckyluuk 🇳🇱 749 57 9ms 28 Jan 2025 567th hoosierEE 748 32 33ms 4 Feb 2022 567th scpchicken 🇵🇼 748 32 33ms 8 Jan 2023 569th SirBogman 🇺🇸 747 52 599ms 5 Jan 2024 570th schachmattmatt 745 55 9ms 26 Sep 2021 570th blaztoma 🇱🇹 745 55 10ms 25 Aug 2025 572nd marshallward 🇺🇸 744 82 39ms 7 Jun 2021 572nd cure-honey 🇯🇵 744 82 38ms 9 Jun 2021 574th Shanethegamer 🇺🇸 743 97 435ms 1 Mar 2022 575th fredrik-bakke 🇳🇴 741 73 38ms 2 Oct 2022 575th fourth-bit 741 73 47ms 5 Dec 2022 575th QuincyNash 🇺🇸 741 73 51ms 5 Dec 2022 575th AlexanderFair 741 73 45ms 2 Jul 2023 575th HumanoidCPU 741 73 12ms 25 May 2024 575th NickTheEASDude 🇺🇸 741 73 48ms 6 Aug 2024 575th AtengChen 741 73 11ms 27 Aug 2024 575th andrewjc2000 741 73 47ms 18 Jul 2025 575th madeforlosers 741 73 11ms 13 Nov 2025 584th albanian-laundromat 739 129 257ms 26 days ago 585th NewDefectus 🇮🇱 737 57 49ms 6 Dec 2021 586th m-tkach 🇺🇦 736 50 42ms 12 Dec 2022 586th Natanaelel 🇸🇪 736 50 39ms 12 Feb 2023 588th ovs-code 🇩🇪 736 51 130ms 17 Nov 2024 589th MeWhenI 🇻🇦 736 72 110ms 28 Feb 2025 590th Steffan153 🇫🇮 736 73 10ms 3 Mar 2024 590th Shanethegamer 🇺🇸 736 73 48ms 8 Apr 2024 592nd Shanethegamer 🇺🇸 735 83 17ms 4 Oct 2024 593rd BlankSpruce 735 107 55ms 24 Sep 2024 594th ovs-code 🇩🇪 734 86 5ms 21 Jul 2024 595th targrik 733 130 277ms 4 Jul 2025 595th snoozingnewt 🇨🇦 733 130 260ms 13 Oct 2025 597th MeWhenI 🇻🇦 732 54 903ms 12 May 2023 597th anter69 🇭🇺 732 54 958ms 24 Oct 2024 599th Waffle3z 732 56 9ms 1 May 2021 599th ArmaanAS 732 56 9ms 21 Jun 2021 599th LukeBridges 🇬🇧 732 56 10ms 30 Jan 2025 599th snoozingnewt 🇨🇦 732 56 9ms 13 Oct 2025 603rd SmartK8 🇨🇿 732 99 312ms 30 Oct 2022 604th adoxography 731 74 46ms 20 Aug 2021 604th m42km 731 74 11ms 25 Nov 2023 604th Stockoh 🇫🇷 731 74 46ms 23 Jun 2024 604th TheZwierzLF 🇵🇱 731 74 11ms 24 May 2025 608th snoozingnewt 🇨🇦 731 84 80ms 13 Oct 2025 609th Natanaelel 🇸🇪 728 28 3ms 20 Jul 2023 609th emgordon154 728 28 21ms 3 Nov 2024 609th lifthrasiir 🇰🇷 728 28 3ms 29 Nov 2024 612th primo-ppcg 🇹🇭 728 47 115ms 21 Jun 2021 613th Mikey-Beep 🇬🇧 728 67 26ms 6 Jun 2024 614th albanian-laundromat 728 78 24ms 15 Aug 2025 615th Alex-x90 🇺🇸 728 108 52ms 9 Dec 2022 615th CatsAreFluffy 728 108 61ms 16 Dec 2022 617th rboath 727 61 83ms 9 Jan 2025 618th edsrzf 🇳🇿 727 84 19ms 16 days ago 619th snoozingnewt 🇨🇦 726 82 2ms 13 Oct 2025 620th MeWhenI 🇻🇦 724 67 3ms 22 Jul 2024 621st potato-jackson 722 75 15ms 10 Sep 2021 621st osmith93 722 75 20ms 14 Jun 2022 621st aksyristos 722 75 43ms 18 Jan 2023 621st celiendonze 🇨🇭 722 75 11ms 11 Apr 2023 621st programjames 722 75 42ms 3 Feb 2024 621st bob-th 722 75 28ms 26 Jul 2024 621st fkantelberg 722 75 38ms 22 Jul 2025 628th eranws 719 57 9ms 9 Sep 2022 628th iczelia 🇩🇪 719 57 10ms 11 Oct 2025 630th stefangimmillaro 719 75 98ms 25 Jun 2023 631st KatieLG 🇬🇧 718 67 409ms 1 Oct 2025 631st albanian-laundromat 718 67 360ms 23 Oct 2025 633rd inventshah 718 131 93ms 9 Sep 2022 634th cure-honey 🇯🇵 717 109 128ms 11 Jul 2021 634th mousetail 🇳🇱 717 109 120ms 18 Jan 2024 636th scpchicken 🇵🇼 713 48 560ms 8 Jan 2023 637th 77Tigers 712 76 44ms 27 May 2021 637th kyleclaassen 712 76 21ms 9 Feb 2022 637th za3k 712 76 15ms 16 Oct 2022 637th cros107 🇦🇺 712 76 45ms 6 Aug 2023 First Prev 561–640 of 1,809 Next Last