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 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 541st fuzzylojik-golf 🇺🇸 945 44 124ms 7 Aug 2025 562nd primo-ppcg 🇹🇭 945 45 83ms 12 Oct 2020 562nd prplz 🇦🇺 945 45 81ms 13 Oct 2020 562nd Lydxn 🇨🇦 945 45 81ms 12 Jan 2021 562nd JayXon 🇺🇸 945 45 80ms 11 Feb 2021 562nd sisyphus-ppcg 🇦🇺 945 45 81ms 30 May 2021 562nd cure-honey 🇯🇵 945 45 79ms 29 Jun 2021 562nd ovs-code 🇩🇪 945 45 88ms 19 Nov 2021 562nd GrayJoKing 🇦🇺 945 45 82ms 14 Mar 2022 562nd lynn 945 45 80ms 3 Jun 2022 562nd stefangimmillaro 945 45 80ms 30 Sep 2022 562nd MeWhenI 🇻🇦 945 45 81ms 10 Oct 2022 562nd clockworknazo 945 45 81ms 13 Oct 2022 562nd Steffan153 🇫🇮 945 45 81ms 24 Nov 2022 562nd sean-niemann 🇺🇸 945 45 81ms 17 Jan 2023 562nd DialFrost 🇸🇬 945 45 86ms 6 Feb 2023 562nd steffan-polygolf 945 45 80ms 19 Feb 2023 562nd Shanethegamer 🇺🇸 945 45 79ms 8 Mar 2023 562nd Yewzir 🇧🇪 945 45 80ms 13 Oct 2023 562nd Betuaredead 945 45 79ms 11 Nov 2023 562nd pardouin 🇫🇷 945 45 80ms 22 Aug 2024 562nd fuzzylojik-golf 🇺🇸 945 45 84ms 12 Jul 2025 562nd edsrzf 🇳🇿 945 45 84ms 26 Jul 2025 562nd albanian-laundromat 945 45 81ms 24 Sep 2025 562nd snoozingnewt 🇨🇦 945 45 80ms 17 days ago 586th Lydxn 🇨🇦 945 68 65ms 1 Jan 2022 586th prplz 🇦🇺 945 68 58ms 1 Jan 2022 586th JayXon 🇺🇸 945 68 83ms 5 Jan 2022 586th sisyphus-ppcg 🇦🇺 945 68 58ms 23 Mar 2022 586th nwellnhof 🇩🇪 945 68 55ms 8 Aug 2022 586th Steffan153 🇫🇮 945 68 60ms 17 Nov 2022 586th inventshah 945 68 71ms 26 Jan 2023 586th sean-niemann 🇺🇸 945 68 64ms 11 Apr 2023 586th Alex-x90 🇺🇸 945 68 73ms 17 Jul 2023 586th xsot 🇸🇬 945 68 62ms 22 May 2024 586th KasperKivimaeki 🇫🇮 945 68 80ms 15 Feb 2025 586th pardouin 🇫🇷 945 68 74ms 31 May 2025 586th fuzzylojik-golf 🇺🇸 945 68 86ms 14 Jul 2025 586th 09cf 945 68 71ms 24 days ago 600th JRaspass 🇬🇧 944 28 99ms 3 May 2018 600th labster 944 28 138ms 28 May 2018 600th phdphil 944 28 116ms 29 May 2018 600th AlexDaniel 🇪🇪 944 28 142ms 11 Oct 2018 600th metakuna 944 28 180ms 16 Apr 2019 600th retrohun 944 28 137ms 27 Apr 2019 600th SirBogman 🇺🇸 944 28 122ms 8 Feb 2020 600th jjatria 944 28 132ms 11 Jul 2020 600th Shanethegamer 🇺🇸 944 28 140ms 20 Mar 2021 600th lynn 944 28 154ms 13 Apr 2021 600th MeWhenI 🇻🇦 944 28 130ms 31 Jan 2023 600th DialFrost 🇸🇬 944 28 121ms 6 Feb 2023 600th SirFireball3521 944 28 142ms 8 Mar 2023 600th Yewzir 🇧🇪 944 28 184ms 17 Nov 2023 600th pardouin 🇫🇷 944 28 120ms 22 Aug 2024 600th fuzzylojik-golf 🇺🇸 944 28 121ms 21 Aug 2025 616th thospel 942 29 2ms 3 May 2018 616th nwellnhof 🇩🇪 942 29 2ms 15 Feb 2020 616th saito-ta 🇯🇵 942 29 2ms 16 Aug 2024 616th xsot 🇸🇬 942 29 2ms 24 Jun 2025 620th Lydxn 🇨🇦 942 42 2ms 30 Oct 2022 620th btnlq 942 42 2ms 5 Nov 2022 620th clockworknazo 942 42 2ms 18 Nov 2022 620th primo-ppcg 🇹🇭 942 42 2ms 19 Nov 2022 620th sisyphus-ppcg 🇦🇺 942 42 2ms 22 Feb 2023 620th xsot 🇸🇬 942 42 2ms 16 May 2023 620th fuzzylojik-golf 🇺🇸 942 42 1ms 12 Aug 2025 620th sean-niemann 🇺🇸 942 42 2ms 27 Aug 2025 620th DialFrost 🇸🇬 942 42 2ms 2 days ago 629th HPWiz 🇳🇿 941 39 16ms 9 Mar 2022 630th Steffan153 🇫🇮 941 43 3ms 16 Apr 2023 630th Shanethegamer 🇺🇸 941 43 4ms 17 Apr 2023 630th Lydxn 🇨🇦 941 43 3ms 18 Apr 2023 630th AlephSquirrel 941 43 5ms 20 Apr 2023 630th primo-ppcg 🇹🇭 941 43 3ms 27 Apr 2023 630th prplz 🇦🇺 941 43 4ms 2 May 2023 630th Yewzir 🇧🇪 941 43 3ms 14 May 2023 630th GrayJoKing 🇦🇺 941 43 4ms 15 Aug 2023 630th btnlq 941 43 3ms 21 Oct 2023 630th Betuaredead 941 43 3ms 11 Nov 2023 630th edsrzf 🇳🇿 941 43 3ms 22 Nov 2024 First Prev 561–640 of 4,138 Next Last