The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Niven Numbers (Long) in all languages in bytes. 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 Bytes Time Submitted 801st GolfingSuccess 🇬🇷 885 26 3ms 9 Feb 2023 801st Natanaelel 🇸🇪 885 26 3ms 18 Nov 2023 801st akamayu-ouo 🇹🇼 885 26 3ms 30 Jul 2024 801st 4hg 🇺🇸 885 26 3ms 9 Sep 2024 801st CornerMercury 🇬🇧 885 26 3ms 16 days ago 806th JRaspass 🇬🇧 885 30 132ms 8 Aug 2022 806th Shanethegamer 🇺🇸 885 30 119ms 8 Aug 2022 806th yokasuretsu 885 30 186ms 6 Jan 2025 809th dokutan 885 36 1,011ms 30 Apr 2024 810th DialFrost 🇸🇬 883 87 57ms 11 Apr 2025 811th AlephSquirrel 883 88 96ms 31 Jan 2025 812th DialFrost 🇸🇬 882 90 113ms 14 Apr 2025 812th edsrzf 🇳🇿 882 90 109ms 24 days ago 812th snoozingnewt 🇨🇦 882 90 100ms 23 days ago 812th pardouin 🇫🇷 882 90 99ms 20 days ago 816th sisyphus-ppcg 🇦🇺 880 69 98ms 14 Oct 2022 816th Steffan153 🇫🇮 880 69 99ms 17 Nov 2022 816th sean-niemann 🇺🇸 880 69 98ms 11 Apr 2023 816th m-tkach 🇺🇦 880 69 99ms 2 Jun 2023 816th stefangimmillaro 880 69 95ms 14 Jun 2023 816th Yewzir 🇧🇪 880 69 102ms 10 Apr 2024 816th pardouin 🇫🇷 880 69 109ms 21 Oct 2024 816th DialFrost 🇸🇬 880 69 110ms 11 Apr 2025 816th fuzzylojik-golf 🇺🇸 880 69 105ms 28 Aug 2025 825th primo-ppcg 🇹🇭 880 94 17ms 4 Sep 2022 825th Steffan153 🇫🇮 880 94 14ms 28 Jul 2024 825th pardouin 🇫🇷 880 94 15ms 21 Oct 2024 828th canissimia 🇦🇶 880 218 7ms 21 Aug 2022 829th ovs-code 🇩🇪 879 54 131ms 4 Aug 2024 829th GrayJoKing 🇦🇺 879 54 132ms 13 Aug 2024 829th rucin93 🇵🇱 879 54 138ms 13 Aug 2024 829th emplv 🇱🇻 879 54 129ms 30 Oct 2024 833rd DialFrost 🇸🇬 878 46 1,800ms 21 Jan 2025 834th DialFrost 🇸🇬 878 63 3ms 11 Apr 2025 835th pardouin 🇫🇷 878 100 25ms 21 Oct 2024 836th BambooleanLogic 🇸🇪 877 55 11ms 22 Aug 2022 836th Mazn3k 877 55 33ms 14 Feb 2023 836th jbt 877 55 13ms 28 Dec 2023 836th xyangst 877 55 13ms 7 Oct 2024 836th tomh1012 877 55 11ms 21 days ago 841st albanian-laundromat 877 64 146ms 15 Nov 2025 842nd JDiLenarda 🇫🇷 877 67 1,288ms 7 Dec 2023 843rd DialFrost 🇸🇬 877 124 468ms 11 Apr 2025 844th SirBogman 🇺🇸 876 53 360ms 16 Jan 2024 844th namelessiw 876 53 356ms 5 Mar 2024 844th commandblockguy 🇺🇸 876 53 343ms 1 Sep 2025 847th pschmid0 🇺🇸 875 54 7ms 8 Aug 2022 847th oddvalue 875 54 7ms 24 Aug 2022 847th Stopi 875 54 7ms 1 Sep 2022 847th janbehrens 🇩🇪 875 54 7ms 27 Nov 2022 847th DialFrost 🇸🇬 875 54 7ms 6 Feb 2023 847th Steffan153 🇫🇮 875 54 7ms 27 Mar 2023 847th stefangimmillaro 875 54 8ms 15 Oct 2023 847th sean-niemann 🇺🇸 875 54 6ms 4 Nov 2023 855th KasperKivimaeki 🇫🇮 875 107 255ms 3 Oct 2025 856th canissimia 🇦🇶 875 149 3,145ms 23 Jul 2023 857th primo-ppcg 🇹🇭 875 184 54ms 13 Aug 2025 858th DialFrost 🇸🇬 874 138 1,668ms 13 Sep 2025 858th pardouin 🇫🇷 874 138 1,727ms 14 Sep 2025 858th JayXon 🇺🇸 874 138 1,687ms 15 Sep 2025 861st guilhem-roy 🇫🇷 873 56 15ms 8 Aug 2022 861st btjones0 873 56 16ms 30 Aug 2022 861st jfallon1997 873 56 16ms 6 Sep 2022 861st suwat513 873 56 19ms 24 Sep 2022 861st StefanHabel 🇨🇦 873 56 16ms 5 Dec 2022 861st LeeCamp 873 56 16ms 12 Jan 2023 861st SirFireball3521 873 56 16ms 9 Feb 2023 861st randolchance 873 56 16ms 9 Feb 2023 861st TaserTheFox 🇺🇸 873 56 16ms 7 Apr 2023 861st TheoKeller1 873 56 15ms 11 Jun 2023 861st kaptsanovb 873 56 16ms 13 Jun 2023 861st BREMAUCY 🇫🇷 873 56 17ms 13 Jul 2023 861st cros107 🇦🇺 873 56 16ms 21 Jul 2023 861st primo-ppcg 🇹🇭 873 56 149ms 3 Aug 2023 861st FortuiteMan 🇫🇷 873 56 20ms 23 Sep 2023 861st minhtrancccp 873 56 17ms 17 Oct 2023 861st mikehanus 873 56 18ms 22 Nov 2023 861st NickTheEASDude 🇺🇸 873 56 16ms 9 Apr 2024 861st wuzekai518 873 56 15ms 19 Jul 2024 861st codingisgreatbutiamnot 873 56 15ms 7 Aug 2024 First Prev 801–880 of 2,480 Next Last