The Calendar hole will go live in approximately 6 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 560th prplz 🇦🇺 945 45 80ms 13 Oct 2020 560th Lydxn 🇨🇦 945 45 81ms 12 Jan 2021 560th JayXon 🇺🇸 945 45 80ms 11 Feb 2021 560th sisyphus-ppcg 🇦🇺 945 45 80ms 30 May 2021 560th cure-honey 🇯🇵 945 45 79ms 29 Jun 2021 560th ovs-code 🇩🇪 945 45 81ms 19 Nov 2021 560th GrayJoKing 🇦🇺 945 45 79ms 14 Mar 2022 560th lynn 945 45 80ms 3 Jun 2022 560th stefangimmillaro 945 45 80ms 30 Sep 2022 560th MeWhenI 🇻🇦 945 45 81ms 10 Oct 2022 560th clockworknazo 945 45 81ms 13 Oct 2022 560th Steffan153 🇫🇮 945 45 81ms 24 Nov 2022 560th sean-niemann 🇺🇸 945 45 81ms 17 Jan 2023 560th DialFrost 🇸🇬 945 45 78ms 6 Feb 2023 560th steffan-polygolf 945 45 80ms 19 Feb 2023 560th Shanethegamer 🇺🇸 945 45 79ms 8 Mar 2023 560th Yewzir 🇧🇪 945 45 80ms 13 Oct 2023 560th Betuaredead 945 45 79ms 11 Nov 2023 560th pardouin 🇫🇷 945 45 80ms 22 Aug 2024 560th fuzzylojik-golf 🇺🇸 945 45 84ms 12 Jul 2025 560th edsrzf 🇳🇿 945 45 84ms 26 Jul 2025 560th albanian-laundromat 945 45 81ms 24 Sep 2025 560th snoozingnewt 🇨🇦 945 45 80ms 21 days ago 584th Lydxn 🇨🇦 945 68 62ms 1 Jan 2022 584th prplz 🇦🇺 945 68 56ms 1 Jan 2022 584th JayXon 🇺🇸 945 68 58ms 5 Jan 2022 584th sisyphus-ppcg 🇦🇺 945 68 52ms 23 Mar 2022 584th nwellnhof 🇩🇪 945 68 55ms 8 Aug 2022 584th Steffan153 🇫🇮 945 68 59ms 17 Nov 2022 584th inventshah 945 68 56ms 26 Jan 2023 584th sean-niemann 🇺🇸 945 68 55ms 11 Apr 2023 584th Alex-x90 🇺🇸 945 68 55ms 17 Jul 2023 584th xsot 🇸🇬 945 68 62ms 22 May 2024 584th KasperKivimaeki 🇫🇮 945 68 61ms 15 Feb 2025 584th pardouin 🇫🇷 945 68 53ms 31 May 2025 584th fuzzylojik-golf 🇺🇸 945 68 59ms 14 Jul 2025 584th 09cf 945 68 60ms 26 Nov 2025 598th JRaspass 🇬🇧 944 28 107ms 3 May 2018 598th labster 944 28 99ms 28 May 2018 598th phdphil 944 28 97ms 29 May 2018 598th AlexDaniel 🇪🇪 944 28 114ms 11 Oct 2018 598th metakuna 944 28 108ms 16 Apr 2019 598th retrohun 944 28 114ms 27 Apr 2019 598th SirBogman 🇺🇸 944 28 111ms 8 Feb 2020 598th jjatria 944 28 93ms 11 Jul 2020 598th Shanethegamer 🇺🇸 944 28 95ms 20 Mar 2021 598th lynn 944 28 114ms 13 Apr 2021 598th MeWhenI 🇻🇦 944 28 113ms 31 Jan 2023 598th DialFrost 🇸🇬 944 28 131ms 6 Feb 2023 598th SirFireball3521 944 28 115ms 8 Mar 2023 598th Yewzir 🇧🇪 944 28 111ms 17 Nov 2023 598th pardouin 🇫🇷 944 28 121ms 22 Aug 2024 598th fuzzylojik-golf 🇺🇸 944 28 90ms 21 Aug 2025 614th thospel 942 29 2ms 3 May 2018 614th nwellnhof 🇩🇪 942 29 2ms 15 Feb 2020 614th saito-ta 🇯🇵 942 29 2ms 16 Aug 2024 614th xsot 🇸🇬 942 29 2ms 24 Jun 2025 618th Lydxn 🇨🇦 942 42 2ms 30 Oct 2022 618th btnlq 942 42 2ms 5 Nov 2022 618th clockworknazo 942 42 2ms 18 Nov 2022 618th primo-ppcg 🇹🇭 942 42 2ms 19 Nov 2022 618th sisyphus-ppcg 🇦🇺 942 42 2ms 22 Feb 2023 618th xsot 🇸🇬 942 42 2ms 16 May 2023 618th fuzzylojik-golf 🇺🇸 942 42 1ms 12 Aug 2025 618th sean-niemann 🇺🇸 942 42 2ms 27 Aug 2025 618th DialFrost 🇸🇬 942 42 2ms 6 days ago 627th HPWiz 🇳🇿 941 39 16ms 9 Mar 2022 628th Steffan153 🇫🇮 941 43 3ms 16 Apr 2023 628th Shanethegamer 🇺🇸 941 43 4ms 17 Apr 2023 628th Lydxn 🇨🇦 941 43 3ms 18 Apr 2023 628th AlephSquirrel 941 43 5ms 20 Apr 2023 628th primo-ppcg 🇹🇭 941 43 3ms 27 Apr 2023 628th prplz 🇦🇺 941 43 4ms 2 May 2023 628th Yewzir 🇧🇪 941 43 3ms 14 May 2023 628th GrayJoKing 🇦🇺 941 43 4ms 15 Aug 2023 628th btnlq 941 43 3ms 21 Oct 2023 628th Betuaredead 941 43 3ms 11 Nov 2023 628th edsrzf 🇳🇿 941 43 3ms 22 Nov 2024 628th sean-niemann 🇺🇸 941 43 3ms 21 Apr 2025 628th kg583 🇺🇸 941 43 3ms 25 Sep 2025 First Prev 561–640 of 4,135 Next Last