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 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 397th primo-ppcg 🇹🇭 941 61 126ms 14 Jan 2022 397th sisyphus-ppcg 🇦🇺 941 61 124ms 17 Jan 2022 397th lynn 941 61 118ms 10 Mar 2022 397th Bubbler-4 941 61 120ms 8 Aug 2022 397th MeWhenI 🇻🇦 941 61 118ms 10 Oct 2022 397th clockworknazo 941 61 120ms 12 Oct 2022 397th andersk 🇺🇸 941 61 123ms 22 Oct 2022 397th Steffan153 🇫🇮 941 61 120ms 17 Nov 2022 397th stefangimmillaro 941 61 122ms 25 Nov 2022 397th sean-niemann 🇺🇸 941 61 122ms 17 Jan 2023 397th DialFrost 🇸🇬 941 61 123ms 18 Jan 2023 397th rucin93 🇵🇱 941 61 123ms 23 Jan 2023 397th Shanethegamer 🇺🇸 941 61 121ms 8 Mar 2023 397th ovs-code 🇩🇪 941 61 119ms 20 Jun 2023 397th Yewzir 🇧🇪 941 61 118ms 23 Sep 2023 397th Betuaredead 941 61 120ms 11 Nov 2023 397th elgan65536 941 61 120ms 5 Mar 2024 397th pardouin 🇫🇷 941 61 122ms 22 Aug 2024 397th nullie 941 61 120ms 18 Dec 2024 397th acotis 941 61 120ms 26 Jan 2025 397th emgordon154 941 61 132ms 18 Feb 2025 397th fuzzylojik-golf 🇺🇸 941 61 172ms 17 Jun 2025 397th edsrzf 🇳🇿 941 61 120ms 26 Jul 2025 397th qpwoeirut 941 61 122ms 16 Aug 2025 397th kumavale 941 61 121ms 17 Aug 2025 397th albanian-laundromat 941 61 119ms 24 Sep 2025 397th snoozingnewt 🇨🇦 941 61 116ms 17 days ago 428th Lydxn 🇨🇦 940 68 65ms 1 Jan 2022 428th prplz 🇦🇺 940 68 58ms 1 Jan 2022 428th JayXon 🇺🇸 940 68 83ms 5 Jan 2022 428th sisyphus-ppcg 🇦🇺 940 68 58ms 23 Mar 2022 428th nwellnhof 🇩🇪 940 68 55ms 8 Aug 2022 428th Steffan153 🇫🇮 940 68 60ms 17 Nov 2022 428th inventshah 940 68 71ms 26 Jan 2023 428th sean-niemann 🇺🇸 940 68 64ms 11 Apr 2023 428th Alex-x90 🇺🇸 940 68 73ms 17 Jul 2023 428th xsot 🇸🇬 940 68 62ms 22 May 2024 428th KasperKivimaeki 🇫🇮 940 68 80ms 15 Feb 2025 428th pardouin 🇫🇷 940 68 74ms 31 May 2025 428th fuzzylojik-golf 🇺🇸 940 68 86ms 14 Jul 2025 428th 09cf 940 68 71ms 25 days ago 442nd edre 939 46 9ms 15 May 2018 442nd davitf 939 46 9ms 24 Oct 2018 442nd rschwa6308 🇺🇸 939 46 9ms 4 Apr 2019 442nd zbreit 🇺🇸 939 46 9ms 4 Apr 2019 442nd petar-donchev 939 46 9ms 24 Aug 2019 442nd daedals 939 46 9ms 15 Oct 2019 442nd teafork 939 46 9ms 9 Feb 2020 442nd andersk 🇺🇸 939 46 10ms 19 Mar 2020 442nd Attero 🇸🇪 939 46 9ms 26 Mar 2020 442nd dmoa 939 46 9ms 10 Jul 2020 442nd hashkitten 939 46 9ms 24 Sep 2020 442nd Dazza314 🇬🇧 939 46 9ms 7 Nov 2020 442nd janbehrens 🇩🇪 939 46 9ms 8 Dec 2020 442nd btjones0 939 46 9ms 27 Dec 2020 442nd OllieBoyne 🇬🇧 939 46 9ms 6 Feb 2021 442nd vezzick 939 46 10ms 5 Mar 2021 442nd RDShah 939 46 9ms 15 Apr 2021 442nd urojony 🇵🇱 939 46 9ms 27 May 2021 442nd MarcMush 🇫🇷 939 46 9ms 29 Jun 2021 442nd Fishron 939 46 9ms 19 Oct 2021 442nd Indivicivet 939 46 9ms 24 Oct 2021 442nd StefanHabel 🇨🇦 939 46 9ms 14 Dec 2021 442nd ZakkkkAttackkkk 🇵🇭 939 46 9ms 20 Dec 2021 442nd Irratix 🇳🇱 939 46 9ms 17 Apr 2022 442nd k3w1k0d3r 939 46 9ms 25 Jun 2022 442nd 051 🇸🇬 939 46 9ms 8 Aug 2022 442nd TobyBoyne 🇬🇧 939 46 9ms 12 Aug 2022 442nd MichalMarsalek 🇨🇿 939 46 9ms 29 Aug 2022 442nd JaimeCoderIO 939 46 9ms 29 Sep 2022 442nd IshanPanpaliya 939 46 9ms 19 Oct 2022 442nd FlorianCassayre 🇫🇷 939 46 9ms 6 Nov 2022 442nd thehylian 939 46 9ms 30 Dec 2022 442nd Techdude01 939 46 9ms 18 Jan 2023 442nd SirFireball3521 939 46 9ms 9 Feb 2023 442nd scpchicken 🇵🇼 939 46 9ms 22 Feb 2023 442nd kellantech 939 46 10ms 2 Jun 2023 442nd lillian314159 939 46 9ms 13 Jul 2023 442nd Alex-x90 🇺🇸 939 46 9ms 17 Jul 2023 442nd AlexanderFair 939 46 9ms 24 Jul 2023 First Prev 401–480 of 4,114 Next Last