The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Van Eck Sequence in Python 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 241st MathieuIko 576 92 41ms 21 Feb 2022 241st SniperSmiley 🇺🇸 576 92 16ms 21 Jun 2022 241st Vaekor 576 92 15ms 28 Jul 2023 241st eiburns 576 92 13ms 27 Oct 2023 245th jtaxen 570 93 23ms 5 Apr 2024 245th PyryL 🇫🇮 570 93 16ms 23 Aug 2024 245th Andrey2001 570 93 45ms 9 days ago 248th j-Ewan 564 94 22ms 1 Mar 2022 248th AbhilashaTandon 564 94 11ms 28 Feb 2023 248th briankuder 564 94 12ms 31 May 2023 251st RDShah 558 95 39ms 25 Nov 2021 251st inverseLorentz 🇦🇺 558 95 16ms 10 Jul 2022 251st Ripick 558 95 14ms 30 Dec 2022 251st fynnkroeger 558 95 16ms 6 Jan 2023 251st brimstonetrader 558 95 16ms 22 Jan 2024 256th RKlazinga 552 96 16ms 14 Aug 2021 256th randolchance 552 96 30ms 9 Feb 2023 256th jmmographer 552 96 17ms 11 Nov 2023 259th smartiel 546 97 54ms 19 Sep 2022 259th qwjhvbxi 546 97 14ms 8 Feb 2024 261st ehulinsky 🇺🇸 541 98 47ms 15 Nov 2021 261st 0dyse 541 98 11ms 6 May 2025 261st damoose717 541 98 15ms 23 May 2025 264th forlack 530 100 17ms 10 Nov 2021 264th midnattssol 🇸🇪 530 100 14ms 19 May 2022 266th WillowWispy 525 101 16ms 19 Mar 2025 267th janga1 520 102 22ms 26 Aug 2021 267th cafehaine 🇫🇷 520 102 16ms 24 May 2022 269th mothcolada 🇺🇸 515 103 23ms 25 May 2021 269th AIn0n 515 103 86ms 27 Oct 2021 269th adamnielson42 🇺🇸 515 103 16ms 8 Nov 2023 272nd mbittner20 510 104 18ms 27 May 2023 273rd EvanDarwin 505 105 17ms 23 Aug 2021 273rd Pena86 505 105 16ms 2 Jan 2022 273rd karhuthebear 505 105 15ms 9 May 2022 273rd Demonarchet 505 105 11ms 18 Apr 2023 273rd DrPrettyman 505 105 14ms 31 May 2023 273rd abhishekg999 505 105 14ms 20 Sep 2024 279th galloj 🇨🇿 500 106 44ms 30 Aug 2022 279th DGipe 500 106 16ms 1 Jul 2024 281st alexjurkiewicz 🇦🇺 495 107 14ms 7 Nov 2023 282nd kevdah 491 108 19ms 7 Jul 2022 282nd jameswmccarty 491 108 18ms 23 Feb 2025 284th jiaminglimjm 🇲🇾 486 109 14ms 5 Jul 2024 285th hjcafaroUC 482 110 28ms 28 May 2021 286th NoahBolohan 🇨🇦 473 112 13ms 26 Jun 2024 287th 40fied4t 469 113 907ms 16 May 2025 288th twocatsinatrenchcoat 465 114 15ms 11 May 2022 289th raketexyz 461 115 21ms 18 Dec 2021 289th eddvrs 461 115 33ms 20 Aug 2022 289th kellantech 461 115 126ms 20 May 2023 292nd yoyoyonono 457 116 25ms 12 Apr 2022 293rd kenny14231 453 117 20ms 11 Jul 2022 293rd kzheng808 453 117 11ms 31 May 2023 295th andrewgopher 449 118 16ms 25 Jun 2022 295th LukasFolwarczny 🇨🇿 449 118 16ms 16 Sep 2022 297th try-except-try-accept 🇹🇭 445 119 21ms 5 Jul 2022 298th abrn 442 120 11ms 30 Jul 2022 299th Thestralos 434 122 13ms 2 Mar 2023 300th KWall1202 431 123 17ms 9 Feb 2022 300th kevinnaviapaiva 431 123 11ms 15 Feb 2025 302nd shibacho 🇯🇵 405 131 17ms 24 Mar 2022 303rd mhenion8293 🇺🇸 402 132 30ms 23 Jan 2022 303rd KingSkyrock 🇺🇸 402 132 21ms 24 Apr 2022 305th Trunksistor 🇫🇷 390 136 33ms 25 May 2022 306th ridingqwerty 🇺🇸 387 137 26ms 21 Dec 2023 307th aglahir1 384 138 18ms 5 Nov 2021 307th r-benson 🇬🇧 384 138 18ms 1 Feb 2023 309th joe0400 366 145 18ms 7 Sep 2021 310th Joe0400Student 363 146 17ms 2 Nov 2021 311th dgambit 351 151 44ms 2 Aug 2021 312th Matherubik1 342 155 21ms 22 Jul 2021 313th atazzam 🇺🇸 340 156 16ms 4 Apr 2022 314th 4ndyJ 🇬🇧 333 159 17ms 6 Mar 2023 315th dylanjones92 327 162 17ms 29 Jan 2024 316th landyrisbad 323 164 17ms 13 Nov 2022 317th vodker1 321 165 34ms 10 Mar 2022 317th dillon-duncando 321 165 52ms 4 Oct 2022 317th tails618 321 165 14ms 22 Aug 2023 320th shinylego 319 166 41ms 13 Nov 2022 First Prev 241–320 of 331 Next Last