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 545th stefangimmillaro 935 44 119ms 11 Jun 2023 545th Yewzir 🇧🇪 935 44 118ms 23 Sep 2023 545th Betuaredead 935 44 119ms 13 Nov 2023 545th pardouin 🇫🇷 935 44 126ms 21 Sep 2024 545th fuzzylojik-golf 🇺🇸 935 44 124ms 7 Aug 2025 566th thospel 934 25 141ms 3 May 2018 566th o0lit3 🇺🇸 934 25 253ms 11 Feb 2021 566th Indivicivet 934 25 155ms 24 Mar 2021 566th scpchicken 🇵🇼 934 25 129ms 8 Mar 2022 566th sisyphus-ppcg 🇦🇺 934 25 116ms 16 Dec 2022 566th 4hg 🇺🇸 934 25 191ms 9 Feb 2023 566th Natanaelel 🇸🇪 934 25 94ms 19 Feb 2023 566th Yewzir 🇧🇪 934 25 141ms 12 Mar 2024 574th btnlq 934 29 230ms 21 Feb 2021 574th nwellnhof 🇩🇪 934 29 246ms 25 Oct 2021 574th primo-ppcg 🇹🇭 934 29 260ms 10 Mar 2022 574th GrayJoKing 🇦🇺 934 29 222ms 10 Mar 2022 574th SirBogman 🇺🇸 934 29 250ms 23 Jun 2022 574th MeWhenI 🇻🇦 934 29 217ms 28 Jan 2023 574th stefangimmillaro 934 29 249ms 29 Oct 2023 574th Yewzir 🇧🇪 934 29 233ms 19 Nov 2023 574th dcgjb 934 29 258ms 24 Jan 2024 574th DialFrost 🇸🇬 934 29 247ms 6 Jun 2024 574th bitsandbeyond 🇳🇱 934 29 216ms 20 Oct 2025 585th Steffan153 🇫🇮 934 38 125ms 4 Aug 2024 585th sean-niemann 🇺🇸 934 38 131ms 4 Aug 2024 585th JayXon 🇺🇸 934 38 131ms 4 Aug 2024 585th DialFrost 🇸🇬 934 38 127ms 4 Aug 2024 585th Lydxn 🇨🇦 934 38 128ms 5 Aug 2024 585th lukegustafson 🇺🇸 934 38 123ms 7 Aug 2024 591st Lydxn 🇨🇦 933 37 72ms 12 Dec 2022 591st ovs-code 🇩🇪 933 37 67ms 29 Jan 2023 591st DialFrost 🇸🇬 933 37 70ms 27 May 2024 591st sean-niemann 🇺🇸 933 37 72ms 12 Jul 2024 591st Steffan153 🇫🇮 933 37 71ms 13 Jul 2024 591st pardouin 🇫🇷 933 37 73ms 22 Aug 2024 597th Lydxn 🇨🇦 933 41 4ms 12 May 2023 597th Steffan153 🇫🇮 933 41 4ms 14 May 2023 597th sean-niemann 🇺🇸 933 41 4ms 21 Apr 2025 600th Lydxn 🇨🇦 931 42 2ms 30 Oct 2022 600th btnlq 931 42 2ms 5 Nov 2022 600th clockworknazo 931 42 2ms 18 Nov 2022 600th primo-ppcg 🇹🇭 931 42 2ms 19 Nov 2022 600th sisyphus-ppcg 🇦🇺 931 42 2ms 22 Feb 2023 600th xsot 🇸🇬 931 42 2ms 16 May 2023 600th fuzzylojik-golf 🇺🇸 931 42 1ms 12 Aug 2025 600th sean-niemann 🇺🇸 931 42 2ms 27 Aug 2025 608th Lydxn 🇨🇦 931 43 115ms 18 Aug 2021 608th JayXon 🇺🇸 931 43 119ms 18 Aug 2021 610th edsrzf 🇳🇿 931 65 495ms 26 Sep 2025 610th DialFrost 🇸🇬 931 65 314ms 26 Sep 2025 610th sean-niemann 🇺🇸 931 65 443ms 26 Sep 2025 610th pardouin 🇫🇷 931 65 330ms 26 Sep 2025 610th fuzzylojik-golf 🇺🇸 931 65 442ms 26 Sep 2025 610th Yewzir 🇧🇪 931 65 437ms 2 Oct 2025 610th namelessiw 931 65 470ms 2 Oct 2025 610th ovs-code 🇩🇪 931 65 437ms 3 Oct 2025 610th m-tkach 🇺🇦 931 65 524ms 3 Oct 2025 610th CaedenHarper 🇨🇦 931 65 420ms 3 Oct 2025 610th stefangimmillaro 931 65 399ms 6 Oct 2025 610th b-illy 🇬🇧 931 65 343ms 9 Oct 2025 610th sisyphus-ppcg 🇦🇺 931 65 451ms 22 days ago 610th ScottHamper 931 65 446ms 18 days ago 610th KasperKivimaeki 🇫🇮 931 65 376ms 16 days ago 610th snoozingnewt 🇨🇦 931 65 352ms 14 days ago 626th error256 930 39 64ms 7 days ago 627th thospel 929 29 2ms 3 May 2018 627th nwellnhof 🇩🇪 929 29 2ms 15 Feb 2020 627th saito-ta 🇯🇵 929 29 2ms 16 Aug 2024 627th xsot 🇸🇬 929 29 2ms 24 Jun 2025 631st villfa 929 43 4ms 11 May 2018 631st alexeytihomirov 929 43 4ms 5 Apr 2019 631st prplz 🇦🇺 929 43 4ms 22 Feb 2020 631st janbehrens 🇩🇪 929 43 4ms 11 Aug 2020 631st Attero 🇸🇪 929 43 4ms 8 Sep 2020 631st JayXon 🇺🇸 929 43 5ms 18 Feb 2021 631st GrayJoKing 🇦🇺 929 43 4ms 27 Feb 2021 631st emplv 🇱🇻 929 43 4ms 6 May 2021 631st Shanethegamer 🇺🇸 929 43 4ms 16 Feb 2022 631st sean-niemann 🇺🇸 929 43 4ms 19 Mar 2022 First Prev 561–640 of 4,111 Next Last