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 800th Natanaelel 🇸🇪 885 26 3ms 18 Nov 2023 800th akamayu-ouo 🇹🇼 885 26 3ms 30 Jul 2024 800th 4hg 🇺🇸 885 26 3ms 9 Sep 2024 800th CornerMercury 🇬🇧 885 26 3ms 15 days ago 805th JRaspass 🇬🇧 885 30 135ms 8 Aug 2022 805th Shanethegamer 🇺🇸 885 30 158ms 8 Aug 2022 805th yokasuretsu 885 30 213ms 6 Jan 2025 808th dokutan 885 36 1,011ms 30 Apr 2024 809th DialFrost 🇸🇬 883 87 57ms 11 Apr 2025 810th AlephSquirrel 883 88 96ms 31 Jan 2025 811th DialFrost 🇸🇬 882 90 113ms 14 Apr 2025 811th edsrzf 🇳🇿 882 90 109ms 24 days ago 811th snoozingnewt 🇨🇦 882 90 100ms 22 days ago 811th pardouin 🇫🇷 882 90 99ms 19 days ago 815th sisyphus-ppcg 🇦🇺 880 69 98ms 14 Oct 2022 815th Steffan153 🇫🇮 880 69 99ms 17 Nov 2022 815th sean-niemann 🇺🇸 880 69 98ms 11 Apr 2023 815th m-tkach 🇺🇦 880 69 99ms 2 Jun 2023 815th stefangimmillaro 880 69 95ms 14 Jun 2023 815th Yewzir 🇧🇪 880 69 102ms 10 Apr 2024 815th pardouin 🇫🇷 880 69 109ms 21 Oct 2024 815th DialFrost 🇸🇬 880 69 110ms 11 Apr 2025 815th fuzzylojik-golf 🇺🇸 880 69 105ms 28 Aug 2025 824th primo-ppcg 🇹🇭 880 94 17ms 4 Sep 2022 824th Steffan153 🇫🇮 880 94 14ms 28 Jul 2024 824th pardouin 🇫🇷 880 94 15ms 21 Oct 2024 827th canissimia 🇦🇶 880 218 7ms 21 Aug 2022 828th ovs-code 🇩🇪 879 54 131ms 4 Aug 2024 828th GrayJoKing 🇦🇺 879 54 132ms 13 Aug 2024 828th rucin93 🇵🇱 879 54 138ms 13 Aug 2024 828th emplv 🇱🇻 879 54 129ms 30 Oct 2024 832nd DialFrost 🇸🇬 878 46 1,800ms 21 Jan 2025 833rd DialFrost 🇸🇬 878 63 3ms 11 Apr 2025 834th pardouin 🇫🇷 878 100 25ms 21 Oct 2024 835th BambooleanLogic 🇸🇪 877 55 11ms 22 Aug 2022 835th Mazn3k 877 55 33ms 14 Feb 2023 835th jbt 877 55 13ms 28 Dec 2023 835th xyangst 877 55 13ms 7 Oct 2024 835th tomh1012 877 55 11ms 20 days ago 840th albanian-laundromat 877 64 146ms 15 Nov 2025 841st JDiLenarda 🇫🇷 877 67 1,288ms 7 Dec 2023 842nd DialFrost 🇸🇬 877 124 468ms 11 Apr 2025 843rd SirBogman 🇺🇸 876 53 360ms 16 Jan 2024 843rd namelessiw 876 53 356ms 5 Mar 2024 843rd commandblockguy 🇺🇸 876 53 343ms 1 Sep 2025 846th pschmid0 🇺🇸 875 54 7ms 8 Aug 2022 846th oddvalue 875 54 7ms 24 Aug 2022 846th Stopi 875 54 7ms 1 Sep 2022 846th janbehrens 🇩🇪 875 54 7ms 27 Nov 2022 846th DialFrost 🇸🇬 875 54 7ms 6 Feb 2023 846th Steffan153 🇫🇮 875 54 7ms 27 Mar 2023 846th stefangimmillaro 875 54 8ms 15 Oct 2023 846th sean-niemann 🇺🇸 875 54 6ms 4 Nov 2023 854th KasperKivimaeki 🇫🇮 875 107 255ms 3 Oct 2025 855th canissimia 🇦🇶 875 149 3,145ms 23 Jul 2023 856th primo-ppcg 🇹🇭 875 184 54ms 13 Aug 2025 857th DialFrost 🇸🇬 874 138 1,668ms 13 Sep 2025 857th pardouin 🇫🇷 874 138 1,727ms 14 Sep 2025 857th JayXon 🇺🇸 874 138 1,687ms 15 Sep 2025 860th guilhem-roy 🇫🇷 873 56 15ms 8 Aug 2022 860th btjones0 873 56 16ms 30 Aug 2022 860th jfallon1997 873 56 16ms 6 Sep 2022 860th suwat513 873 56 19ms 24 Sep 2022 860th StefanHabel 🇨🇦 873 56 16ms 5 Dec 2022 860th LeeCamp 873 56 16ms 12 Jan 2023 860th SirFireball3521 873 56 16ms 9 Feb 2023 860th randolchance 873 56 16ms 9 Feb 2023 860th TaserTheFox 🇺🇸 873 56 16ms 7 Apr 2023 860th TheoKeller1 873 56 15ms 11 Jun 2023 860th kaptsanovb 873 56 16ms 13 Jun 2023 860th BREMAUCY 🇫🇷 873 56 17ms 13 Jul 2023 860th cros107 🇦🇺 873 56 16ms 21 Jul 2023 860th primo-ppcg 🇹🇭 873 56 149ms 3 Aug 2023 860th FortuiteMan 🇫🇷 873 56 20ms 23 Sep 2023 860th minhtrancccp 873 56 17ms 17 Oct 2023 860th mikehanus 873 56 18ms 22 Nov 2023 860th NickTheEASDude 🇺🇸 873 56 16ms 9 Apr 2024 860th wuzekai518 873 56 15ms 19 Jul 2024 860th codingisgreatbutiamnot 873 56 15ms 7 Aug 2024 860th alemelis 873 56 18ms 31 Aug 2024 First Prev 801–880 of 2,480 Next Last