The Calendar hole will go live in approximately 7 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 558th JayXon 🇺🇸 945 45 80ms 11 Feb 2021 558th sisyphus-ppcg 🇦🇺 945 45 81ms 30 May 2021 558th cure-honey 🇯🇵 945 45 79ms 29 Jun 2021 558th ovs-code 🇩🇪 945 45 88ms 19 Nov 2021 558th GrayJoKing 🇦🇺 945 45 82ms 14 Mar 2022 558th lynn 945 45 80ms 3 Jun 2022 558th stefangimmillaro 945 45 80ms 30 Sep 2022 558th MeWhenI 🇻🇦 945 45 81ms 10 Oct 2022 558th clockworknazo 945 45 81ms 13 Oct 2022 558th Steffan153 🇫🇮 945 45 81ms 24 Nov 2022 558th sean-niemann 🇺🇸 945 45 81ms 17 Jan 2023 558th DialFrost 🇸🇬 945 45 86ms 6 Feb 2023 558th steffan-polygolf 945 45 80ms 19 Feb 2023 558th Shanethegamer 🇺🇸 945 45 79ms 8 Mar 2023 558th Yewzir 🇧🇪 945 45 80ms 13 Oct 2023 558th Betuaredead 945 45 79ms 11 Nov 2023 558th pardouin 🇫🇷 945 45 80ms 22 Aug 2024 558th fuzzylojik-golf 🇺🇸 945 45 84ms 12 Jul 2025 558th edsrzf 🇳🇿 945 45 84ms 26 Jul 2025 558th albanian-laundromat 945 45 81ms 24 Sep 2025 558th snoozingnewt 🇨🇦 945 45 80ms 19 days ago 582nd Lydxn 🇨🇦 945 68 65ms 1 Jan 2022 582nd prplz 🇦🇺 945 68 58ms 1 Jan 2022 582nd JayXon 🇺🇸 945 68 83ms 5 Jan 2022 582nd sisyphus-ppcg 🇦🇺 945 68 58ms 23 Mar 2022 582nd nwellnhof 🇩🇪 945 68 55ms 8 Aug 2022 582nd Steffan153 🇫🇮 945 68 60ms 17 Nov 2022 582nd inventshah 945 68 71ms 26 Jan 2023 582nd sean-niemann 🇺🇸 945 68 64ms 11 Apr 2023 582nd Alex-x90 🇺🇸 945 68 73ms 17 Jul 2023 582nd xsot 🇸🇬 945 68 62ms 22 May 2024 582nd KasperKivimaeki 🇫🇮 945 68 80ms 15 Feb 2025 582nd pardouin 🇫🇷 945 68 74ms 31 May 2025 582nd fuzzylojik-golf 🇺🇸 945 68 86ms 14 Jul 2025 582nd 09cf 945 68 71ms 27 days ago 596th JRaspass 🇬🇧 944 28 114ms 3 May 2018 596th labster 944 28 101ms 28 May 2018 596th phdphil 944 28 112ms 29 May 2018 596th AlexDaniel 🇪🇪 944 28 118ms 11 Oct 2018 596th metakuna 944 28 112ms 16 Apr 2019 596th retrohun 944 28 128ms 27 Apr 2019 596th SirBogman 🇺🇸 944 28 134ms 8 Feb 2020 596th jjatria 944 28 93ms 11 Jul 2020 596th Shanethegamer 🇺🇸 944 28 123ms 20 Mar 2021 596th lynn 944 28 119ms 13 Apr 2021 596th MeWhenI 🇻🇦 944 28 134ms 31 Jan 2023 596th DialFrost 🇸🇬 944 28 132ms 6 Feb 2023 596th SirFireball3521 944 28 133ms 8 Mar 2023 596th Yewzir 🇧🇪 944 28 123ms 17 Nov 2023 596th pardouin 🇫🇷 944 28 135ms 22 Aug 2024 596th fuzzylojik-golf 🇺🇸 944 28 129ms 21 Aug 2025 612th thospel 942 29 2ms 3 May 2018 612th nwellnhof 🇩🇪 942 29 2ms 15 Feb 2020 612th saito-ta 🇯🇵 942 29 2ms 16 Aug 2024 612th xsot 🇸🇬 942 29 2ms 24 Jun 2025 616th Lydxn 🇨🇦 942 42 2ms 30 Oct 2022 616th btnlq 942 42 2ms 5 Nov 2022 616th clockworknazo 942 42 2ms 18 Nov 2022 616th primo-ppcg 🇹🇭 942 42 2ms 19 Nov 2022 616th sisyphus-ppcg 🇦🇺 942 42 2ms 22 Feb 2023 616th xsot 🇸🇬 942 42 2ms 16 May 2023 616th fuzzylojik-golf 🇺🇸 942 42 1ms 12 Aug 2025 616th sean-niemann 🇺🇸 942 42 2ms 27 Aug 2025 616th DialFrost 🇸🇬 942 42 2ms 4 days ago 625th HPWiz 🇳🇿 941 39 16ms 9 Mar 2022 626th Steffan153 🇫🇮 941 43 3ms 16 Apr 2023 626th Shanethegamer 🇺🇸 941 43 4ms 17 Apr 2023 626th Lydxn 🇨🇦 941 43 3ms 18 Apr 2023 626th AlephSquirrel 941 43 5ms 20 Apr 2023 626th primo-ppcg 🇹🇭 941 43 3ms 27 Apr 2023 626th prplz 🇦🇺 941 43 4ms 2 May 2023 626th Yewzir 🇧🇪 941 43 3ms 14 May 2023 626th GrayJoKing 🇦🇺 941 43 4ms 15 Aug 2023 626th btnlq 941 43 3ms 21 Oct 2023 626th Betuaredead 941 43 3ms 11 Nov 2023 626th edsrzf 🇳🇿 941 43 3ms 22 Nov 2024 626th sean-niemann 🇺🇸 941 43 3ms 21 Apr 2025 626th kg583 🇺🇸 941 43 3ms 25 Sep 2025 639th edre 941 46 9ms 15 May 2018 639th davitf 941 46 9ms 24 Oct 2018 First Prev 561–640 of 4,134 Next Last