The Calendar hole will go live in approximately 13 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 208th snoozingnewt 🇨🇦 960 45 9ms 14 days ago 208th ryyyn 🇺🇸 960 45 10ms 9 days ago 208th AdrienHache 🇫🇷 960 45 10ms 106 mins ago 244th sisyphus-ppcg 🇦🇺 960 49 1ms 17 Jun 2021 244th Lydxn 🇨🇦 960 49 1ms 17 Jun 2021 244th HPWiz 🇳🇿 960 49 1ms 28 Jun 2021 244th prplz 🇦🇺 960 49 1ms 8 Jul 2021 244th JayXon 🇺🇸 960 49 1ms 5 Jan 2022 244th nwellnhof 🇩🇪 960 49 1ms 8 Aug 2022 244th saito-ta 🇯🇵 960 49 2ms 9 Aug 2022 244th Steffan153 🇫🇮 960 49 2ms 17 Nov 2022 244th inventshah 960 49 1ms 26 Jan 2023 244th sean-niemann 🇺🇸 960 49 2ms 11 Apr 2023 244th Alex-x90 🇺🇸 960 49 1ms 17 Jul 2023 244th rhdqor213 960 49 2ms 10 Aug 2023 244th JohandeRuiter 🇳🇱 960 49 2ms 22 Oct 2023 244th xsot 🇸🇬 960 49 1ms 22 May 2024 244th kaurakeksi 🇫🇮 960 49 2ms 30 Dec 2024 244th Mukundan314 960 49 1ms 28 Apr 2025 244th pardouin 🇫🇷 960 49 2ms 31 May 2025 244th fuzzylojik-golf 🇺🇸 960 49 2ms 14 Jul 2025 244th 09cf 960 49 2ms 21 days ago 244th KasperKivimaeki 🇫🇮 960 49 2ms 7 days ago 264th primo-ppcg 🇹🇭 959 25 2ms 22 Jun 2021 264th HPWiz 🇳🇿 959 25 2ms 7 Feb 2022 264th GrayJoKing 🇦🇺 959 25 2ms 7 Feb 2022 264th ovs-code 🇩🇪 959 25 2ms 27 Nov 2022 264th Lydxn 🇨🇦 959 25 2ms 4 Aug 2023 264th MeWhenI 🇻🇦 959 25 2ms 17 Feb 2025 270th primo-ppcg 🇹🇭 953 34 364ms 19 Dec 2018 270th JayXon 🇺🇸 953 34 381ms 25 Feb 2021 270th Lydxn 🇨🇦 953 34 329ms 18 Aug 2021 270th Steffan153 🇫🇮 953 34 344ms 25 Apr 2023 270th sean-niemann 🇺🇸 953 34 327ms 19 Apr 2025 275th prplz 🇦🇺 951 33 914ms 23 Mar 2021 275th JayXon 🇺🇸 951 33 975ms 24 Mar 2021 275th primo-ppcg 🇹🇭 951 33 1,277ms 24 Mar 2021 275th sisyphus-ppcg 🇦🇺 951 33 919ms 3 Apr 2021 275th Shanethegamer 🇺🇸 951 33 826ms 28 May 2021 275th Lydxn 🇨🇦 951 33 921ms 11 Jun 2021 275th GrayJoKing 🇦🇺 951 33 1,138ms 8 Sep 2021 275th lynn 951 33 1,052ms 1 Jun 2022 275th SirBogman 🇺🇸 951 33 1,145ms 10 Aug 2022 275th Steffan153 🇫🇮 951 33 1,089ms 16 Dec 2022 275th stefangimmillaro 951 33 897ms 17 Dec 2022 275th sean-niemann 🇺🇸 951 33 870ms 4 Jan 2023 275th DialFrost 🇸🇬 951 33 947ms 18 Jan 2023 275th inventshah 951 33 1,047ms 27 Sep 2023 275th Yewzir 🇧🇪 951 33 1,119ms 6 Feb 2024 275th error256 951 33 916ms 29 Jul 2024 275th emgordon154 951 33 894ms 12 Nov 2024 275th pardouin 🇫🇷 951 33 1,052ms 13 Apr 2025 275th fuzzylojik-golf 🇺🇸 951 33 1,000ms 21 Aug 2025 275th snoozingnewt 🇨🇦 951 33 753ms 8 days ago 295th primo-ppcg 🇹🇭 951 42 4ms 11 May 2018 295th sisyphus-ppcg 🇦🇺 951 42 5ms 17 Jun 2021 295th Lydxn 🇨🇦 951 42 4ms 7 Apr 2022 295th xsot 🇸🇬 951 42 4ms 23 May 2025 295th targrik 951 42 5ms 21 days ago 295th KasperKivimaeki 🇫🇮 951 42 5ms 7 days ago 301st alexkunin 950 43 9ms 3 Jul 2019 301st Mazn3k 950 43 8ms 9 Sep 2021 301st SpareManiKatti 950 43 9ms 11 Sep 2021 301st jared-hughes 950 43 8ms 13 Aug 2022 301st AlephSquirrel 950 43 8ms 12 Jan 2023 301st ejini6969 950 43 9ms 25 Mar 2023 301st albanian-laundromat 950 43 8ms 24 Sep 2025 301st Babafaba 950 43 9ms 30 Oct 2025 309th primo-ppcg 🇹🇭 948 39 9ms 1 Mar 2021 309th GrayJoKing 🇦🇺 948 39 14ms 8 Sep 2021 311th JayXon 🇺🇸 948 58 311ms 21 Nov 2021 311th Lydxn 🇨🇦 948 58 360ms 21 Nov 2021 311th nwellnhof 🇩🇪 948 58 306ms 21 Nov 2021 311th btnlq 948 58 345ms 10 Mar 2023 311th AdrienHache 🇫🇷 948 58 334ms 31 May 2023 311th stefangimmillaro 948 58 386ms 21 Aug 2023 311th namelessiw 948 58 334ms 12 Dec 2023 311th Yax42 🇫🇷 948 58 379ms 9 Feb 2025 319th marcin7Cd 947 52 113ms 15 Mar 2020 319th primo-ppcg 🇹🇭 947 52 110ms 25 Apr 2020 First Prev 241–320 of 4,111 Next Last