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 395th thehylian 827 62 11ms 26 Dec 2022 395th davecame 827 62 12ms 17 Nov 2023 395th Lewenhaupt 827 62 12ms 26 Apr 2024 395th HumanoidCPU 827 62 12ms 25 May 2024 395th dirckvdende 827 62 15ms 21 Jul 2025 406th lynn 825 29 35ms 1 May 2021 407th jared-hughes 825 71 2ms 17 Mar 2022 407th LorenzoDeGaspari 825 71 2ms 26 Jul 2022 407th 09cf 825 71 2ms 8 Oct 2023 407th AZTECCO 825 71 2ms 17 Sep 2025 411th error256 824 57 63ms 13 Sep 2024 412th stefangimmillaro 823 88 342ms 5 May 2023 412th Yax42 🇫🇷 823 88 377ms 16 Aug 2025 414th MeWhenI 🇻🇦 823 93 528ms 7 Nov 2025 415th stefangimmillaro 823 95 129ms 28 May 2024 416th Lydxn 🇨🇦 822 54 106ms 28 Jun 2023 417th neihousaigaai 820 50 9ms 3 May 2021 417th uttumuttu 🇫🇮 820 50 9ms 8 Jan 2022 417th jared-hughes 820 50 9ms 6 Apr 2022 417th janbehrens 🇩🇪 820 50 9ms 31 May 2022 417th inventshah 820 50 9ms 15 Nov 2022 417th Maznek 820 50 9ms 28 Jun 2023 417th voytxt 🇨🇿 820 50 10ms 11 Jul 2024 417th Lv0Sys 🇵🇱 820 50 10ms 13 days ago 425th albanian-laundromat 820 76 42ms 6 Sep 2025 426th typeswitch-dev 🇵🇹 818 81 5ms 4 Aug 2023 427th ovs-code 🇩🇪 818 88 452ms 14 Mar 2022 428th primo-ppcg 🇹🇭 817 64 136ms 6 Aug 2024 429th GrayJoKing 🇦🇺 817 66 95ms 6 Feb 2023 429th sean-niemann 🇺🇸 817 66 98ms 19 Jul 2024 431st KatieLG 🇬🇧 816 59 389ms 28 Oct 2024 432nd primo-ppcg 🇹🇭 815 65 112ms 11 Jul 2022 433rd nwellnhof 🇩🇪 814 38 9ms 14 Oct 2021 433rd Steffan153 🇫🇮 814 38 3ms 29 Aug 2024 433rd saito-ta 🇯🇵 814 38 2ms 4 Aug 2025 436th edsrzf 🇳🇿 814 56 777ms 4 Sep 2025 436th CaedenHarper 🇨🇦 814 56 738ms 2 Oct 2025 436th albanian-laundromat 814 56 732ms 4 Nov 2025 439th firegene 🇮🇪 814 63 48ms 5 Jan 2023 439th hiichbindermax 814 63 11ms 17 Feb 2023 439th wh3n3v3r 🇨🇿 814 63 17ms 14 Nov 2024 439th Emutis 🇱🇹 814 63 11ms 15 Feb 2025 439th solisolu 814 63 28ms 22 days ago 444th prplz 🇦🇺 814 72 2ms 1 May 2021 444th NewDefectus 🇮🇱 814 72 2ms 3 May 2021 446th MeWhenI 🇻🇦 814 89 347ms 8 Dec 2022 447th primo-ppcg 🇹🇭 813 103 25ms 10 May 2023 448th SirBogman 🇺🇸 812 40 1,023ms 9 Apr 2022 449th dcgjb 810 48 464ms 22 Feb 2024 449th Steffan153 🇫🇮 810 48 342ms 9 Aug 2024 451st GrayJoKing 🇦🇺 809 61 8ms 11 Oct 2023 452nd Steffan153 🇫🇮 809 89 393ms 23 Jul 2024 452nd sean-niemann 🇺🇸 809 89 459ms 2 Jan 2025 454th emgordon154 807 49 1,096ms 27 Nov 2024 455th clockworknazo 807 74 5ms 22 Nov 2022 456th inventshah 807 80 4,010ms 12 Nov 2024 457th primo-ppcg 🇹🇭 806 63 5ms 16 Aug 2023 458th prplz 🇦🇺 805 90 322ms 21 Nov 2021 458th sean-niemann 🇺🇸 805 90 382ms 2 Jan 2025 460th emgordon154 804 169 1,740ms 16 Sep 2025 461st tayloia 🇬🇧 803 51 9ms 18 May 2023 462nd MeWhenI 🇻🇦 802 60 399ms 29 Apr 2025 463rd Just4FunCoder 801 64 19ms 23 Mar 2023 463rd AlephSquirrel 801 64 38ms 18 Apr 2023 463rd msbranicky 801 64 12ms 25 Jul 2023 463rd Alex-x90 🇺🇸 801 64 18ms 6 Nov 2023 463rd Pyroan 801 64 22ms 13 Mar 2025 463rd BREMAUCY 🇫🇷 801 64 11ms 26 Jul 2025 463rd wobblybits 801 64 15ms 21 Aug 2025 463rd vhoulbreque 🇫🇷 801 64 12ms 15 days ago 471st Waffle3z 800 46 34ms 1 May 2021 471st Shanethegamer 🇺🇸 800 46 60ms 15 Dec 2022 473rd lynn 800 99 31ms 18 Jul 2023 473rd Steffan153 🇫🇮 800 99 29ms 25 Aug 2024 475th Argeento 🇵🇱 798 46 127ms 3 Aug 2024 476th Shanethegamer 🇺🇸 797 81 3,828ms 24 Oct 2024 477th sisyphus-ppcg 🇦🇺 793 39 3ms 20 Jan 2023 478th MeWhenI 🇻🇦 793 119 302ms 9 Feb 2023 479th janbehrens 🇩🇪 792 74 2ms 1 May 2021 479th luuumine 🇫🇷 792 74 2ms 7 Nov 2025 First Prev 401–480 of 1,786 Next Last