The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Niven Numbers (Long) 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 641st MeWhenI 🇻🇦 896 69 38ms 21 Feb 2023 642nd Shanethegamer 🇺🇸 896 75 19ms 11 Dec 2023 642nd Steffan153 🇫🇮 896 75 18ms 11 Dec 2023 642nd Lydxn 🇨🇦 896 75 21ms 22 Dec 2023 642nd kg583 🇺🇸 896 75 19ms 31 Jul 2025 646th DialFrost 🇸🇬 895 92 17ms 14 Apr 2025 646th UnderKoen 🇳🇱 895 92 17ms 15 Apr 2025 648th primo-ppcg 🇹🇭 893 64 40ms 4 Sep 2022 649th GrayJoKing 🇦🇺 890 85 74ms 14 Aug 2022 649th primo-ppcg 🇹🇭 890 85 62ms 7 Dec 2022 649th inventshah 890 85 67ms 26 Jan 2023 649th m-tkach 🇺🇦 890 85 65ms 2 Jun 2023 649th snyderek 🇺🇸 890 85 70ms 24 Nov 2024 654th yzhs 🇩🇪 889 41 55ms 21 Jun 2023 654th adoxography 889 41 52ms 19 Nov 2023 654th Ralac07 🇦🇺 889 41 40ms 13 Jun 2024 657th sisyphus-ppcg 🇦🇺 889 45 2,412ms 2 Nov 2023 658th Maznek 889 54 34ms 22 Jun 2023 659th Waffle3z 889 62 3ms 8 Aug 2022 659th GrayJoKing 🇦🇺 889 62 3ms 13 Aug 2022 659th jared-hughes 889 62 3ms 13 Aug 2022 659th primo-ppcg 🇹🇭 889 62 4ms 4 Sep 2022 659th Steffan153 🇫🇮 889 62 3ms 10 Dec 2022 659th sean-niemann 🇺🇸 889 62 3ms 11 Apr 2023 659th Yewzir 🇧🇪 889 62 3ms 10 Apr 2024 659th pardouin 🇫🇷 889 62 3ms 21 Oct 2024 659th fuzzylojik-golf 🇺🇸 889 62 3ms 3 Jul 2025 668th ovs-code 🇩🇪 889 76 4ms 15 Jul 2023 669th GrayJoKing 🇦🇺 889 80 27ms 2 Jan 2023 669th MeWhenI 🇻🇦 889 80 27ms 21 Feb 2023 669th m-tkach 🇺🇦 889 80 27ms 2 Jun 2023 669th lynn 889 80 27ms 16 Jul 2023 669th Yewzir 🇧🇪 889 80 27ms 10 Apr 2024 674th MeWhenI 🇻🇦 888 86 46ms 11 Feb 2025 675th inventshah 887 51 357ms 16 Jan 2024 675th GolfingSuccess 🇬🇷 887 51 358ms 20 Jan 2024 675th ridingqwerty 🇺🇸 887 51 358ms 22 Jan 2024 675th Yewzir 🇧🇪 887 51 380ms 24 Feb 2024 675th neel11235813 887 51 350ms 10 Mar 2024 675th duckyluuk 🇳🇱 887 51 345ms 27 Mar 2024 675th b-illy 🇬🇧 887 51 359ms 9 Sep 2024 675th emgordon154 887 51 360ms 13 Apr 2025 675th Babafaba 887 51 338ms 17 Oct 2025 684th SirBogman 🇺🇸 887 55 16ms 8 Aug 2022 684th RDShah 887 55 16ms 9 Aug 2022 684th OllieBoyne 🇬🇧 887 55 15ms 12 Aug 2022 684th TobyBoyne 🇬🇧 887 55 15ms 12 Aug 2022 684th dzshn 887 55 19ms 17 Aug 2022 684th HETHAT 🇩🇿 887 55 16ms 18 Aug 2022 684th Fishron 887 55 19ms 29 Sep 2022 684th CheeseCake628 🇳🇴 887 55 17ms 19 Mar 2023 684th 4ndyJ 🇬🇧 887 55 17ms 20 Mar 2023 684th InigoK 🇺🇸 887 55 18ms 25 Apr 2023 684th Andriamanitra 🇫🇮 887 55 16ms 20 Jul 2023 684th namelessiw 887 55 16ms 5 Mar 2024 684th jtaxen 887 55 18ms 26 Mar 2024 684th rollershutter 887 55 16ms 4 Jul 2024 684th LostSyntax21 🇬🇧 887 55 16ms 10 Sep 2024 684th JunkIce 887 55 15ms 24 Nov 2024 684th 5quiwyrm 887 55 16ms 10 Dec 2024 684th souta-1326 887 55 16ms 25 Mar 2025 684th wobblybits 887 55 16ms 23 Aug 2025 684th Emutis 🇱🇹 887 55 16ms 16 Sep 2025 704th GrayJoKing 🇦🇺 887 66 3ms 14 Aug 2022 704th primo-ppcg 🇹🇭 887 66 3ms 4 Sep 2022 704th inventshah 887 66 4ms 26 Jan 2023 704th m-tkach 🇺🇦 887 66 3ms 2 Jun 2023 704th b-illy 🇬🇧 887 66 3ms 2 days ago 709th fuzzylojik-golf 🇺🇸 886 53 6ms 10 Sep 2025 709th targrik 886 53 7ms 21 days ago 709th KasperKivimaeki 🇫🇮 886 53 24ms 7 days ago 712th ovs-code 🇩🇪 886 56 294ms 19 Nov 2025 713th m-tkach 🇺🇦 886 93 16ms 2 Jun 2023 713th Lydxn 🇨🇦 886 93 17ms 19 Jul 2023 715th primo-ppcg 🇹🇭 885 68 16ms 4 Sep 2022 716th ovs-code 🇩🇪 885 72 421ms 8 Aug 2022 716th Yax42 🇫🇷 885 72 443ms 5 Oct 2025 718th DialFrost 🇸🇬 885 79 335ms 26 Sep 2025 718th sean-niemann 🇺🇸 885 79 445ms 26 Sep 2025 718th pardouin 🇫🇷 885 79 429ms 26 Sep 2025 First Prev 641–720 of 2,465 Next Last