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 319th henkma 947 52 114ms 14 Jun 2020 319th prplz 🇦🇺 947 52 111ms 18 Oct 2020 319th HPWiz 🇳🇿 947 52 116ms 12 Nov 2020 319th JayXon 🇺🇸 947 52 114ms 18 Feb 2021 319th lynn 947 52 113ms 22 Mar 2021 319th Lydxn 🇨🇦 947 52 113ms 22 Mar 2021 319th kops-cg 947 52 111ms 7 Apr 2021 319th xnor-gate 947 52 111ms 9 Jun 2021 319th ssiquoya 🇷🇺 947 52 109ms 11 Jun 2021 319th GrayJoKing 🇦🇺 947 52 117ms 7 Oct 2021 319th annaproxy 947 52 119ms 24 Dec 2021 319th ovs-code 🇩🇪 947 52 114ms 16 Feb 2022 319th Steffan153 🇫🇮 947 52 117ms 20 Nov 2022 319th Shanethegamer 🇺🇸 947 52 115ms 8 Mar 2023 319th sean-niemann 🇺🇸 947 52 111ms 4 Jul 2023 319th Sakisan 🇧🇪 947 52 115ms 16 Jul 2023 319th btnlq 947 52 113ms 14 Oct 2023 319th Yewzir 🇧🇪 947 52 118ms 20 Nov 2023 319th DialFrost 🇸🇬 947 52 116ms 4 Aug 2024 319th pardouin 🇫🇷 947 52 116ms 21 Aug 2024 319th fuzzylojik-golf 🇺🇸 947 52 115ms 27 Aug 2025 319th albanian-laundromat 947 52 116ms 4 Oct 2025 319th snoozingnewt 🇨🇦 947 52 120ms 13 days ago 344th primo-ppcg 🇹🇭 946 46 1ms 25 Apr 2020 344th prplz 🇦🇺 946 46 1ms 16 May 2020 344th Waffle3z 946 46 1ms 18 Oct 2020 344th Lydxn 🇨🇦 946 46 1ms 12 Jan 2021 344th JayXon 🇺🇸 946 46 2ms 11 Feb 2021 344th sisyphus-ppcg 🇦🇺 946 46 1ms 8 Jun 2021 344th ovs-code 🇩🇪 946 46 1ms 19 Nov 2021 344th GrayJoKing 🇦🇺 946 46 2ms 14 Mar 2022 344th lynn 946 46 1ms 3 Jun 2022 344th jared-hughes 946 46 1ms 13 Aug 2022 344th MeWhenI 🇻🇦 946 46 1ms 10 Oct 2022 344th clockworknazo 946 46 1ms 12 Oct 2022 344th Steffan153 🇫🇮 946 46 2ms 30 Nov 2022 344th btnlq 946 46 1ms 26 Dec 2022 344th sean-niemann 🇺🇸 946 46 1ms 17 Jan 2023 344th DialFrost 🇸🇬 946 46 1ms 6 Feb 2023 344th Shanethegamer 🇺🇸 946 46 2ms 8 Mar 2023 344th xsot 🇸🇬 946 46 1ms 9 Oct 2023 344th Betuaredead 946 46 1ms 12 Nov 2023 344th Yewzir 🇧🇪 946 46 1ms 14 Nov 2023 344th pardouin 🇫🇷 946 46 1ms 21 Sep 2024 344th FlyingPenguin223 946 46 1ms 5 Oct 2024 344th fuzzylojik-golf 🇺🇸 946 46 1ms 3 Jul 2025 344th GolfingSuccess 🇬🇷 946 46 1ms 12 Nov 2025 368th JayXon 🇺🇸 946 64 336ms 4 days ago 368th Lydxn 🇨🇦 946 64 330ms 4 days ago 370th Lydxn 🇨🇦 943 42 374ms 16 Jan 2024 370th Steffan153 🇫🇮 943 42 388ms 16 Jan 2024 370th DialFrost 🇸🇬 943 42 397ms 16 Jan 2024 370th sisyphus-ppcg 🇦🇺 943 42 358ms 16 Jan 2024 370th sean-niemann 🇺🇸 943 42 382ms 17 Jan 2024 370th JayXon 🇺🇸 943 42 359ms 17 Jan 2024 370th GrayJoKing 🇦🇺 943 42 416ms 18 Jan 2024 370th orthoplex 🇨🇽 943 42 383ms 24 Jan 2024 370th m-tkach 🇺🇦 943 42 365ms 26 Jan 2024 370th xsot 🇸🇬 943 42 389ms 29 Jan 2024 370th Yewzir 🇧🇪 943 42 354ms 4 Feb 2024 370th Shanethegamer 🇺🇸 943 42 348ms 24 Mar 2024 370th pardouin 🇫🇷 943 42 374ms 11 Jul 2024 370th MeWhenI 🇻🇦 943 42 394ms 13 Jul 2024 370th b-illy 🇬🇧 943 42 367ms 7 Sep 2024 370th emgordon154 943 42 377ms 10 Oct 2024 370th fuzzylojik-golf 🇺🇸 943 42 371ms 3 Jul 2025 370th ovs-code 🇩🇪 943 42 374ms 15 Jul 2025 370th kg583 🇺🇸 943 42 416ms 26 Jul 2025 370th Babafaba 943 42 395ms 22 days ago 390th primo-ppcg 🇹🇭 941 50 1ms 18 Feb 2021 390th michael-pruglo 🇺🇦 941 50 1ms 13 Jul 2022 390th ovs-code 🇩🇪 941 50 2ms 8 Oct 2023 390th Mandrzejy 🇵🇱 941 50 1ms 17 Apr 2024 390th qwertyuiop3 🇷🇺 941 50 2ms 14 May 2025 390th b-illy 🇬🇧 941 50 1ms 5 Jun 2025 396th prplz 🇦🇺 941 61 121ms 13 Jan 2022 396th GrayJoKing 🇦🇺 941 61 120ms 13 Jan 2022 396th JayXon 🇺🇸 941 61 120ms 13 Jan 2022 396th Lydxn 🇨🇦 941 61 120ms 13 Jan 2022 396th primo-ppcg 🇹🇭 941 61 126ms 14 Jan 2022 First Prev 321–400 of 4,111 Next Last