The Calendar hole will go live in approximately 12 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 881st GitMensch 578 294 22ms 8 hours ago 882nd targrik 577 71 10ms 29 Jul 2025 883rd Shanethegamer 🇺🇸 577 145 25ms 13 Jul 2021 884th bastienvoirin 🇫🇷 576 89 16ms 14 Sep 2021 884th Troon 576 89 50ms 18 Oct 2022 884th PaulMWeiser 576 89 17ms 5 Mar 2023 884th aalec 576 89 23ms 25 Apr 2024 884th ComputerKWasTaken 🇺🇸 576 89 10ms 23 Jan 2025 884th ImpressedByRocks 576 89 59ms 13 Feb 2025 884th smilesformiles3 576 89 54ms 24 Sep 2025 891st j-Ewan 576 164 293ms 23 Mar 2022 891st 0xjac 🇨🇭 576 164 292ms 9 Jun 2025 893rd TheZwierzLF 🇵🇱 575 64 33ms 47 hours ago 894th c0d3-4-F00d 🇩🇪 575 102 2ms 5 Dec 2021 895th prplz 🇦🇺 575 133 385ms 11 May 2021 896th snoozingnewt 🇨🇦 574 99 2ms 13 Oct 2025 897th MeWhenI 🇻🇦 573 54 3ms 16 Apr 2023 898th MarcMush 🇫🇷 573 74 956ms 11 Jul 2021 898th snoozingnewt 🇨🇦 573 74 472ms 14 Oct 2025 900th Mabeloid 🇳🇴 573 84 482ms 6 Oct 2024 901st cbrt-x 572 94 120ms 20 Jan 2025 902nd akshatj27 🇦🇶 572 165 275ms 11 Jan 2022 903rd janbehrens 🇩🇪 571 134 409ms 21 Nov 2022 904th jhonw 570 42 34ms 23 Sep 2023 905th wiebecommajonas 570 137 128ms 20 Nov 2021 906th SpareManiKatti 569 72 10ms 10 Sep 2021 906th CatsAreFluffy 569 72 10ms 16 Dec 2022 908th AkashTandon167 569 90 14ms 1 Nov 2021 908th jfallon1997 569 90 74ms 9 Aug 2022 908th myleopard 569 90 18ms 22 Dec 2022 908th thienudomsrirungruang 569 90 15ms 14 Nov 2024 912th warmCabin 569 103 2ms 7 Nov 2023 913th MeWhenI 🇻🇦 568 100 2ms 15 Sep 2022 914th yoshykai 567 135 429ms 31 Mar 2025 915th Shanethegamer 🇺🇸 565 75 458ms 2 Sep 2021 916th MaxElf999 563 91 21ms 27 Sep 2022 916th Yewzir 🇧🇪 563 91 31ms 19 May 2023 916th aaardwark 563 91 17ms 2 Jun 2025 916th YAJUE114514 563 91 17ms 3 Jul 2025 916th osNiko 🇧🇷 563 91 17ms 22 Aug 2025 921st snoozingnewt 🇨🇦 563 98 82ms 13 Oct 2025 922nd weliveinhell 🇭🇹 563 104 3ms 3 Oct 2023 923rd MeWhenI 🇻🇦 562 79 90ms 12 Dec 2022 924th Shotokhan 562 140 2,825ms 2 Oct 2025 925th snoozingnewt 🇨🇦 562 149 26ms 13 Oct 2025 926th btjones0 561 64 14ms 20 May 2021 927th JOrE20 🇺🇸 561 73 10ms 5 Nov 2025 928th Shanethegamer 🇺🇸 560 82 16ms 8 Sep 2021 929th cure-honey 🇯🇵 558 110 97ms 11 Jul 2021 930th Jacob385 558 137 606ms 28 Oct 2025 931st MathieuIko 557 92 41ms 21 Feb 2022 931st SniperSmiley 🇺🇸 557 92 16ms 21 Jun 2022 931st Vaekor 557 92 15ms 28 Jul 2023 931st eiburns 557 92 13ms 27 Oct 2023 935th trinityy-7 554 74 10ms 6 Feb 2024 936th roavin 553 131 371ms 23 Jun 2022 937th scpchicken 🇵🇼 552 56 26ms 17 Dec 2022 938th Chinay-Domitrix 🇺🇸 552 117 2,723ms 2 Apr 2025 939th ashtraypettingzoo 🇺🇸 551 37 3ms 5 Apr 2023 940th jtaxen 551 93 23ms 5 Apr 2024 940th PyryL 🇫🇮 551 93 16ms 23 Aug 2024 940th Andrey2001 551 93 45ms 10 days ago 943rd targrik 550 66 64ms 29 Jul 2025 944th MeWhenI 🇻🇦 550 95 121ms 15 Nov 2022 945th snoozingnewt 🇨🇦 547 71 255ms 13 Oct 2025 946th HumanoidCPU 547 140 425ms 8 Nov 2025 947th adoxography 546 75 13ms 20 Aug 2021 948th snoozingnewt 🇨🇦 546 97 105ms 13 Oct 2025 949th madeforlosers 546 114 41ms 25 Oct 2023 950th snoozingnewt 🇨🇦 546 144 3,104ms 13 Oct 2025 951st j-Ewan 545 94 22ms 1 Mar 2022 951st AbhilashaTandon 545 94 11ms 28 Feb 2023 951st briankuder 545 94 12ms 31 May 2023 954th bac0id 545 133 334ms 26 Sep 2023 955th MeWhenI 🇻🇦 543 99 11ms 9 May 2024 955th snoozingnewt 🇨🇦 543 99 10ms 13 Oct 2025 957th neihousaigaai 543 141 397ms 2 May 2021 958th pschmid0 🇺🇸 542 67 5ms 1 Oct 2022 959th emgordon154 540 68 129ms 4 Aug 2024 960th edsrzf 🇳🇿 540 94 5ms 8 Dec 2024 First Prev 881–960 of 1,787 Next Last