The Calendar hole will go live in approximately 9 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 209th 09cf 960 45 12ms 25 days ago 209th snoozingnewt 🇨🇦 960 45 9ms 18 days ago 209th ryyyn 🇺🇸 960 45 10ms 14 days ago 209th AdrienHache 🇫🇷 960 45 10ms 4 days ago 245th sisyphus-ppcg 🇦🇺 960 49 1ms 17 Jun 2021 245th Lydxn 🇨🇦 960 49 1ms 17 Jun 2021 245th HPWiz 🇳🇿 960 49 1ms 28 Jun 2021 245th prplz 🇦🇺 960 49 1ms 8 Jul 2021 245th JayXon 🇺🇸 960 49 1ms 5 Jan 2022 245th nwellnhof 🇩🇪 960 49 1ms 8 Aug 2022 245th saito-ta 🇯🇵 960 49 2ms 9 Aug 2022 245th Steffan153 🇫🇮 960 49 2ms 17 Nov 2022 245th inventshah 960 49 1ms 26 Jan 2023 245th sean-niemann 🇺🇸 960 49 2ms 11 Apr 2023 245th Alex-x90 🇺🇸 960 49 1ms 17 Jul 2023 245th rhdqor213 960 49 2ms 10 Aug 2023 245th JohandeRuiter 🇳🇱 960 49 2ms 22 Oct 2023 245th xsot 🇸🇬 960 49 1ms 22 May 2024 245th kaurakeksi 🇫🇮 960 49 2ms 30 Dec 2024 245th Mukundan314 960 49 1ms 28 Apr 2025 245th pardouin 🇫🇷 960 49 2ms 31 May 2025 245th fuzzylojik-golf 🇺🇸 960 49 2ms 14 Jul 2025 245th 09cf 960 49 2ms 25 days ago 245th KasperKivimaeki 🇫🇮 960 49 2ms 11 days ago 265th primo-ppcg 🇹🇭 959 25 2ms 22 Jun 2021 265th HPWiz 🇳🇿 959 25 2ms 7 Feb 2022 265th GrayJoKing 🇦🇺 959 25 2ms 7 Feb 2022 265th ovs-code 🇩🇪 959 25 2ms 27 Nov 2022 265th Lydxn 🇨🇦 959 25 2ms 4 Aug 2023 265th MeWhenI 🇻🇦 959 25 2ms 17 Feb 2025 271st primo-ppcg 🇹🇭 953 34 364ms 19 Dec 2018 271st JayXon 🇺🇸 953 34 381ms 25 Feb 2021 271st Lydxn 🇨🇦 953 34 329ms 18 Aug 2021 271st Steffan153 🇫🇮 953 34 344ms 25 Apr 2023 271st sean-niemann 🇺🇸 953 34 327ms 19 Apr 2025 276th prplz 🇦🇺 951 33 914ms 23 Mar 2021 276th JayXon 🇺🇸 951 33 975ms 24 Mar 2021 276th primo-ppcg 🇹🇭 951 33 1,277ms 24 Mar 2021 276th sisyphus-ppcg 🇦🇺 951 33 919ms 3 Apr 2021 276th Shanethegamer 🇺🇸 951 33 826ms 28 May 2021 276th Lydxn 🇨🇦 951 33 921ms 11 Jun 2021 276th GrayJoKing 🇦🇺 951 33 1,138ms 8 Sep 2021 276th lynn 951 33 1,052ms 1 Jun 2022 276th SirBogman 🇺🇸 951 33 1,145ms 10 Aug 2022 276th Steffan153 🇫🇮 951 33 1,089ms 16 Dec 2022 276th stefangimmillaro 951 33 897ms 17 Dec 2022 276th sean-niemann 🇺🇸 951 33 870ms 4 Jan 2023 276th DialFrost 🇸🇬 951 33 947ms 18 Jan 2023 276th inventshah 951 33 1,047ms 27 Sep 2023 276th Yewzir 🇧🇪 951 33 1,119ms 6 Feb 2024 276th error256 951 33 916ms 29 Jul 2024 276th emgordon154 951 33 894ms 12 Nov 2024 276th pardouin 🇫🇷 951 33 1,052ms 13 Apr 2025 276th fuzzylojik-golf 🇺🇸 951 33 1,000ms 21 Aug 2025 276th snoozingnewt 🇨🇦 951 33 753ms 12 days ago 296th primo-ppcg 🇹🇭 951 42 4ms 11 May 2018 296th sisyphus-ppcg 🇦🇺 951 42 5ms 17 Jun 2021 296th Lydxn 🇨🇦 951 42 4ms 7 Apr 2022 296th xsot 🇸🇬 951 42 4ms 23 May 2025 296th targrik 951 42 5ms 25 days ago 296th KasperKivimaeki 🇫🇮 951 42 5ms 12 days ago 302nd alexkunin 950 43 9ms 3 Jul 2019 302nd Mazn3k 950 43 8ms 9 Sep 2021 302nd SpareManiKatti 950 43 9ms 11 Sep 2021 302nd jared-hughes 950 43 8ms 13 Aug 2022 302nd AlephSquirrel 950 43 8ms 12 Jan 2023 302nd ejini6969 950 43 9ms 25 Mar 2023 302nd 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 4,114 Next Last