The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Niven Numbers 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 721st Attero 🇸🇪 926 47 1ms 29 Mar 2020 721st Irratix 🇳🇱 926 47 1ms 15 Jan 2021 721st dokutan 926 47 2ms 21 Sep 2024 721st GalladeGuy 🇺🇸 926 47 1ms 15 Dec 2024 721st TheDrawingCoder-Gamer 926 47 1ms 3 Jul 2025 721st edsrzf 🇳🇿 926 47 2ms 20 Aug 2025 721st snoozingnewt 🇨🇦 926 47 1ms 17 days ago 728th ovs-code 🇩🇪 926 50 2ms 9 Sep 2022 728th Shanethegamer 🇺🇸 926 50 2ms 9 Sep 2022 728th Lydxn 🇨🇦 926 50 2ms 9 Sep 2022 728th MeWhenI 🇻🇦 926 50 2ms 10 Sep 2022 728th JayXon 🇺🇸 926 50 2ms 10 Sep 2022 728th sean-niemann 🇺🇸 926 50 2ms 10 Sep 2022 728th GrayJoKing 🇦🇺 926 50 2ms 11 Sep 2022 728th btnlq 926 50 2ms 13 Sep 2022 728th clockworknazo 926 50 2ms 12 Oct 2022 728th prplz 🇦🇺 926 50 2ms 30 Nov 2022 728th Steffan153 🇫🇮 926 50 2ms 30 Nov 2022 728th DialFrost 🇸🇬 926 50 2ms 26 Jan 2023 728th inventshah 926 50 3ms 26 Jan 2023 728th m-tkach 🇺🇦 926 50 2ms 2 Jun 2023 728th sisyphus-ppcg 🇦🇺 926 50 2ms 29 Oct 2023 728th Betuaredead 926 50 2ms 13 Nov 2023 728th Yewzir 🇧🇪 926 50 2ms 14 Nov 2023 728th pardouin 🇫🇷 926 50 2ms 22 Aug 2024 728th fuzzylojik-golf 🇺🇸 926 50 2ms 18 Jul 2025 728th GolfingSuccess 🇬🇷 926 50 2ms 10 Aug 2025 728th albanian-laundromat 926 50 2ms 16 Sep 2025 728th snoozingnewt 🇨🇦 926 50 2ms 11 days ago 750th cure-honey 🇯🇵 926 62 116ms 29 Jun 2021 750th nipzu 926 62 118ms 13 Jan 2022 750th Creative0708 🇨🇦 926 62 114ms 16 Dec 2023 750th okaponta 926 62 122ms 11 Jan 2024 750th dokutan 926 62 121ms 27 Mar 2024 750th ian-h-chamberlain 🇺🇸 926 62 133ms 3 Nov 2025 750th luuumine 🇫🇷 926 62 113ms 11 Nov 2025 757th Lydxn 🇨🇦 924 40 10ms 4 Jan 2022 757th saito-ta 🇯🇵 924 40 3ms 9 Nov 2023 759th GrayJoKing 🇦🇺 924 46 3ms 29 Sep 2022 759th Lydxn 🇨🇦 924 46 3ms 29 Sep 2022 759th ovs-code 🇩🇪 924 46 3ms 29 Sep 2022 759th clockworknazo 924 46 3ms 30 Sep 2022 759th DialFrost 🇸🇬 924 46 3ms 29 Jan 2023 759th Steffan153 🇫🇮 924 46 3ms 3 Feb 2023 759th sisyphus-ppcg 🇦🇺 924 46 3ms 6 Feb 2023 759th prplz 🇦🇺 924 46 3ms 16 May 2023 759th sean-niemann 🇺🇸 924 46 3ms 23 Oct 2023 759th xsot 🇸🇬 924 46 3ms 8 Feb 2024 759th Yewzir 🇧🇪 924 46 3ms 2 Mar 2024 759th pardouin 🇫🇷 924 46 3ms 22 Aug 2024 759th edsrzf 🇳🇿 924 46 3ms 8 Nov 2025 772nd MeWhenI 🇻🇦 923 34 930ms 10 Sep 2021 772nd anter69 🇭🇺 923 34 964ms 24 Feb 2023 772nd ovs-code 🇩🇪 923 34 955ms 4 Sep 2023 772nd FlyingPenguin223 923 34 957ms 24 Oct 2024 772nd edsrzf 🇳🇿 923 34 897ms 26 Jul 2025 777th Lydxn 🇨🇦 923 49 66ms 15 May 2022 777th prplz 🇦🇺 923 49 72ms 16 May 2022 777th GrayJoKing 🇦🇺 923 49 72ms 20 May 2022 777th Steffan153 🇫🇮 923 49 72ms 20 Nov 2022 777th clockworknazo 923 49 78ms 25 Nov 2022 777th Shanethegamer 🇺🇸 923 49 73ms 8 Mar 2023 777th JayXon 🇺🇸 923 49 72ms 19 Mar 2023 777th Yewzir 🇧🇪 923 49 74ms 9 Nov 2023 777th Betuaredead 923 49 70ms 11 Nov 2023 777th pardouin 🇫🇷 923 49 67ms 3 Sep 2024 777th DialFrost 🇸🇬 923 49 70ms 14 Nov 2024 777th sean-niemann 🇺🇸 923 49 69ms 18 Apr 2025 777th edsrzf 🇳🇿 923 49 68ms 26 Jul 2025 777th albanian-laundromat 923 49 84ms 8 Nov 2025 777th snoozingnewt 🇨🇦 923 49 67ms 14 days ago 792nd GrayJoKing 🇦🇺 922 49 12ms 23 Nov 2021 792nd btnlq 922 49 12ms 9 Dec 2021 792nd Lydxn 🇨🇦 922 49 13ms 9 Jan 2022 792nd prplz 🇦🇺 922 49 13ms 14 Apr 2022 792nd primo-ppcg 🇹🇭 922 49 13ms 2 Jun 2022 792nd lynn 922 49 13ms 3 Jun 2022 792nd IanUtley 922 49 12ms 12 Nov 2022 792nd Steffan153 🇫🇮 922 49 13ms 17 Nov 2022 792nd annaproxy 922 49 13ms 8 Jan 2023 First Prev 721–800 of 4,114 Next Last