The Calendar hole will go live in approximately 28 hours. 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 639th codereport 🇨🇦 707 52 55ms 21 Apr 2025 639th snoozingnewt 🇨🇦 707 52 40ms 13 Oct 2025 643rd emgordon154 707 203 502ms 6 Nov 2025 644th KatieLG 🇬🇧 706 56 987ms 13 Oct 2021 645th jared-hughes 705 51 6ms 17 Jul 2022 646th Shanethegamer 🇺🇸 704 34 34ms 6 May 2021 646th MeWhenI 🇻🇦 704 34 34ms 9 Nov 2021 646th sisyphus-ppcg 🇦🇺 704 34 35ms 2 Mar 2022 649th snoozingnewt 🇨🇦 704 63 129ms 29 Nov 2025 650th razetime 703 29 3ms 13 Jan 2022 651st snoozingnewt 🇨🇦 703 69 2ms 13 Oct 2025 652nd Irratix 🇳🇱 702 73 41ms 7 May 2022 652nd fredrik-bakke 🇳🇴 702 73 38ms 2 Oct 2022 652nd fourth-bit 702 73 47ms 5 Dec 2022 652nd CatsAreFluffy 702 73 23ms 17 Dec 2022 652nd jmerle 🇳🇱 702 73 64ms 16 Feb 2023 652nd AlexanderFair 702 73 45ms 2 Jul 2023 652nd NickTheEASDude 🇺🇸 702 73 48ms 6 Aug 2024 652nd AtengChen 702 73 11ms 27 Aug 2024 652nd andrewjc2000 702 73 47ms 18 Jul 2025 652nd madeforlosers 702 73 11ms 13 Nov 2025 662nd Herbert00709 🇵🇱 702 112 55ms 1 Nov 2024 663rd GolfingSuccess 🇬🇷 701 81 18ms 11 Sep 2022 664th MeWhenI 🇻🇦 700 194 1,704ms 7 Nov 2025 665th commandblockguy 🇺🇸 698 69 472ms 15 Jan 2024 665th TheZwierzLF 🇵🇱 698 69 414ms 22 Nov 2025 667th luuumine 🇫🇷 698 112 116ms 16 Nov 2025 668th Shanethegamer 🇺🇸 696 73 23ms 28 Apr 2023 669th oceko 696 113 66ms 19 Feb 2024 670th MeWhenI 🇻🇦 695 114 29ms 7 Jun 2023 671st adoxography 694 53 48ms 20 Aug 2021 671st schachmattmatt 694 53 40ms 25 Sep 2021 671st anter69 🇭🇺 694 53 42ms 9 Jan 2023 671st tatzyr 🇯🇵 694 53 46ms 18 Jan 2025 675th ovs-code 🇩🇪 694 86 5ms 21 Jul 2024 676th MeWhenI 🇻🇦 694 90 41ms 17 Feb 2023 677th adoxography 693 74 46ms 20 Aug 2021 677th m42km 693 74 11ms 25 Nov 2023 677th Stockoh 🇫🇷 693 74 46ms 23 Jun 2024 677th TheZwierzLF 🇵🇱 693 74 11ms 24 May 2025 681st frankgraziano 693 245 15ms 30 Sep 2025 682nd DialFrost 🇸🇬 692 52 10ms 22 hours ago 683rd ian-h-chamberlain 🇺🇸 692 113 122ms 6 Jul 2022 684th Shanethegamer 🇺🇸 691 78 101ms 15 Oct 2022 685th MeWhenI 🇻🇦 690 56 2ms 4 Nov 2022 686th arjanadriaanse 🇳🇱 690 78 141ms 10 Feb 2022 686th tobeannouncd 690 78 1,395ms 8 Jan 2024 688th emgordon154 689 85 2ms 24 Dec 2021 689th Shanethegamer 🇺🇸 689 111 431ms 25 Sep 2025 689th snoozingnewt 🇨🇦 689 111 441ms 13 Oct 2025 691st JunkIce 688 70 385ms 3 Dec 2024 692nd o0lit3 🇺🇸 687 45 11ms 4 May 2021 693rd albanian-laundromat 685 248 13ms 18 Sep 2025 694th msbranicky 684 83 2ms 4 Aug 2023 695th kkoenig 684 138 267ms 4 Jan 2024 696th Naruyoko 683 60 13ms 13 Aug 2023 696th two-bad 🇬🇧 683 60 20ms 15 Feb 2024 696th emgordon154 683 60 21ms 6 May 2025 696th Yax42 🇫🇷 683 60 10ms 9 Sep 2025 700th potato-jackson 683 75 15ms 10 Sep 2021 700th osmith93 683 75 20ms 14 Jun 2022 700th aksyristos 683 75 43ms 18 Jan 2023 700th celiendonze 🇨🇭 683 75 11ms 11 Apr 2023 700th programjames 683 75 42ms 3 Feb 2024 700th bob-th 683 75 28ms 26 Jul 2024 700th fkantelberg 683 75 38ms 22 Jul 2025 707th Shanethegamer 🇺🇸 680 30 3ms 5 Nov 2023 707th MeWhenI 🇻🇦 680 30 3ms 6 Nov 2023 709th albanian-laundromat 678 57 2ms 26 days ago 710th scpchicken 🇵🇼 677 48 560ms 8 Jan 2023 711th Shanethegamer 🇺🇸 677 107 341ms 27 May 2022 712th MeWhenI 🇻🇦 676 73 3ms 10 Oct 2023 713th 77Tigers 674 76 44ms 27 May 2021 713th kyleclaassen 674 76 21ms 9 Feb 2022 713th za3k 674 76 15ms 16 Oct 2022 713th cros107 🇦🇺 674 76 45ms 6 Aug 2023 717th emgordon154 674 116 144ms 22 Feb 2025 718th heypwesto 🇳🇿 672 46 2ms 3 Jun 2021 719th MeWhenI 🇻🇦 672 54 6ms 29 May 2023 720th FlorianCassayre 🇫🇷 672 61 9ms 22 Jan 2023 First Prev 641–720 of 1,789 Next Last