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 320th HPWiz 🇳🇿 859 36 4ms 2 May 2021 322nd Lydxn 🇨🇦 859 46 1,137ms 27 Jun 2023 323rd zacjl 858 81 47ms 14 Feb 2025 324th KasperKivimaeki 🇫🇮 858 110 272ms 29 Sep 2025 325th MichalMarsalek 🇨🇿 857 61 135ms 15 Nov 2021 325th GrayJoKing 🇦🇺 857 61 136ms 8 May 2022 327th jared-hughes 855 28 33ms 23 Sep 2021 327th neel11235813 855 28 34ms 4 Mar 2023 329th m-tkach 🇺🇦 855 92 73ms 2 Jan 2022 329th inventshah 855 92 62ms 16 Dec 2022 329th 09cf 855 92 58ms 9 Sep 2023 329th ovs-code 🇩🇪 855 92 68ms 3 Jun 2024 329th KasperKivimaeki 🇫🇮 855 92 64ms 21 days ago 334th dmrichwa 🇺🇸 854 48 9ms 25 Apr 2022 335th marcin7Cd 854 60 10ms 1 May 2021 335th RYNO8 854 60 29ms 29 Aug 2021 335th jared-hughes 854 60 12ms 11 Sep 2022 335th quimey 854 60 10ms 15 Mar 2023 335th janbehrens 🇩🇪 854 60 11ms 17 Jun 2023 335th tobeannouncd 854 60 10ms 18 Sep 2023 335th Hyunwook-Kim-WV 854 60 11ms 7 Aug 2025 335th blaztoma 🇱🇹 854 60 31ms 11 Sep 2025 335th jacekwladzinski 854 60 29ms 3 Oct 2025 335th edsrzf 🇳🇿 854 60 10ms 23 days ago 335th sisyphus-ppcg 🇦🇺 854 60 30ms 17 days ago 346th JayXon 🇺🇸 854 159 1,642ms 15 Sep 2025 347th GrayJoKing 🇦🇺 853 43 125ms 4 Aug 2024 348th stefangimmillaro 853 72 87ms 7 May 2023 349th namelessiw 852 85 359ms 16 Aug 2025 349th DialFrost 🇸🇬 852 85 389ms 16 Nov 2025 351st GrayJoKing 🇦🇺 850 24 3ms 5 Jun 2025 352nd MeWhenI 🇻🇦 850 208 928ms 12 Dec 2021 353rd Shanethegamer 🇺🇸 849 169 477ms 28 Apr 2025 354th primo-ppcg 🇹🇭 848 72 18ms 22 Jan 2023 355th CaedenHarper 🇨🇦 845 57 360ms 10 Sep 2024 355th DialFrost 🇸🇬 845 57 386ms 30 Dec 2024 357th yeminghan2021 845 93 80ms 3 Feb 2025 358th Steffan153 🇫🇮 843 64 100ms 18 Jul 2024 359th tomtheisen 🇺🇸 843 86 325ms 21 Nov 2021 360th emplv 🇱🇻 843 112 267ms 19 Feb 2022 361st primo-ppcg 🇹🇭 841 47 975ms 1 May 2021 361st pardouin 🇫🇷 841 47 890ms 10 Sep 2025 363rd ovs-code 🇩🇪 841 58 17ms 1 Jul 2024 364th Shanethegamer 🇺🇸 841 73 99ms 13 May 2021 365th Steffan153 🇫🇮 840 46 2ms 20 Jul 2024 365th sean-niemann 🇺🇸 840 46 2ms 28 Apr 2025 367th knyghty 840 61 11ms 17 Feb 2024 367th zacjl 840 61 11ms 11 Sep 2024 367th MeWhenI 🇻🇦 840 61 10ms 29 Apr 2025 367th robin-scragg 840 61 14ms 24 Jul 2025 367th ryyyn 🇺🇸 840 61 17ms 20 Nov 2025 372nd ovs-code 🇩🇪 839 171 399ms 9 Mar 2025 373rd m-tkach 🇺🇦 837 70 2ms 20 Dec 2021 373rd inventshah 837 70 2ms 24 Nov 2022 373rd ovs-code 🇩🇪 837 70 2ms 12 Feb 2023 373rd ListeriaM 837 70 2ms 21 Aug 2023 377th prplz 🇦🇺 836 44 37ms 1 May 2021 378th duckyluuk 🇳🇱 836 49 10ms 3 Oct 2024 379th Shanethegamer 🇺🇸 836 58 2ms 24 May 2021 380th MeWhenI 🇻🇦 836 94 83ms 8 May 2022 380th jared-hughes 836 94 81ms 20 Jul 2022 380th janbehrens 🇩🇪 836 94 68ms 20 Nov 2022 380th MateuszPietrzak 🇵🇱 836 94 78ms 11 Jan 2024 380th luuumine 🇫🇷 836 94 79ms 10 Nov 2025 385th stefangimmillaro 835 73 43ms 21 Jun 2023 386th rucin93 🇵🇱 834 44 125ms 3 Aug 2024 387th GrayJoKing 🇦🇺 833 61 30ms 18 Aug 2023 388th sean-niemann 🇺🇸 832 92 460ms 26 Sep 2025 388th stefangimmillaro 832 92 407ms 6 Oct 2025 390th sean-niemann 🇺🇸 830 75 41ms 26 Apr 2025 391st lynn 829 83 1,381ms 13 Sep 2021 392nd Shanethegamer 🇺🇸 828 64 99ms 24 May 2021 393rd GolfingSuccess 🇬🇷 828 95 59ms 2 Jan 2022 394th edsrzf 🇳🇿 828 114 263ms 8 Nov 2024 395th Kloppermand 🇩🇰 827 62 10ms 23 Sep 2021 395th guilhem-roy 🇫🇷 827 62 11ms 24 Feb 2022 395th CedricGebistorf 827 62 15ms 26 Feb 2022 395th inventshah 827 62 43ms 15 Nov 2022 395th QuincyNash 🇺🇸 827 62 49ms 5 Dec 2022 395th StefanHabel 🇨🇦 827 62 11ms 20 Dec 2022 First Prev 321–400 of 1,786 Next Last