The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Niven Numbers (Long) 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 795th firegene 🇮🇪 871 56 17ms 4 Jan 2023 795th LeeCamp 871 56 16ms 12 Jan 2023 795th SirFireball3521 871 56 16ms 9 Feb 2023 795th randolchance 871 56 16ms 9 Feb 2023 795th TaserTheFox 🇺🇸 871 56 16ms 7 Apr 2023 795th TheoKeller1 871 56 15ms 11 Jun 2023 795th BREMAUCY 🇫🇷 871 56 17ms 13 Jul 2023 795th cros107 🇦🇺 871 56 16ms 21 Jul 2023 795th primo-ppcg 🇹🇭 871 56 149ms 3 Aug 2023 795th FortuiteMan 🇫🇷 871 56 20ms 23 Sep 2023 795th minhtrancccp 871 56 17ms 17 Oct 2023 795th mikehanus 871 56 18ms 22 Nov 2023 795th zwxzwxzwx21 871 56 16ms 30 Jan 2024 795th NickTheEASDude 🇺🇸 871 56 16ms 9 Apr 2024 795th wuzekai518 871 56 15ms 19 Jul 2024 795th codingisgreatbutiamnot 871 56 15ms 7 Aug 2024 795th alemelis 871 56 18ms 31 Aug 2024 795th hiichbindermax 871 56 16ms 16 Sep 2024 795th Powerroff 871 56 17ms 11 Nov 2024 795th Europe2048 871 56 22ms 24 Nov 2024 795th ApoChagi 871 56 16ms 17 Oct 2025 795th butnaruteodor 871 56 20ms 30 Oct 2025 823rd JDiLenarda 🇫🇷 871 67 1,288ms 7 Dec 2023 824th primo-ppcg 🇹🇭 871 102 268ms 4 Sep 2022 824th m-tkach 🇺🇦 871 102 266ms 14 Jun 2023 824th DialFrost 🇸🇬 871 102 258ms 11 Apr 2025 824th CaedenHarper 🇨🇦 871 102 342ms 9 days ago 828th JayXon 🇺🇸 871 133 1,655ms 15 Sep 2025 829th DialFrost 🇸🇬 870 46 1,928ms 21 Jan 2025 830th DialFrost 🇸🇬 870 52 363ms 15 Jan 2024 830th prplz 🇦🇺 870 52 360ms 15 Jan 2024 830th dokutan 870 52 371ms 1 May 2024 830th lifthrasiir 🇰🇷 870 52 350ms 2 Dec 2024 830th albanian-laundromat 870 52 352ms 25 Aug 2025 835th jared-hughes 870 165 26ms 18 Dec 2024 836th pschmid0 🇺🇸 869 54 6ms 8 Aug 2022 836th oddvalue 869 54 7ms 24 Aug 2022 836th Stopi 869 54 6ms 1 Sep 2022 836th janbehrens 🇩🇪 869 54 7ms 27 Nov 2022 836th DialFrost 🇸🇬 869 54 6ms 6 Feb 2023 836th Steffan153 🇫🇮 869 54 7ms 27 Mar 2023 836th stefangimmillaro 869 54 6ms 15 Oct 2023 836th sean-niemann 🇺🇸 869 54 7ms 4 Nov 2023 844th sisyphus-ppcg 🇦🇺 869 62 108ms 11 Aug 2022 844th Yewzir 🇧🇪 869 62 119ms 10 Apr 2024 844th sean-niemann 🇺🇸 869 62 95ms 27 Apr 2024 844th pardouin 🇫🇷 869 62 90ms 21 Oct 2024 844th DialFrost 🇸🇬 869 62 102ms 11 Apr 2025 844th fuzzylojik-golf 🇺🇸 869 62 93ms 29 Aug 2025 850th DialFrost 🇸🇬 869 87 78ms 11 Apr 2025 851st DialFrost 🇸🇬 868 88 45ms 11 Apr 2025 851st pardouin 🇫🇷 868 88 50ms 25 Apr 2025 853rd MeWhenI 🇻🇦 867 95 15ms 21 Feb 2023 853rd Yewzir 🇧🇪 867 95 15ms 4 May 2024 855th Steffan153 🇫🇮 866 66 40ms 28 Jul 2024 855th pardouin 🇫🇷 866 66 42ms 17 Mar 2025 855th DialFrost 🇸🇬 866 66 40ms 11 Apr 2025 858th MeWhenI 🇻🇦 866 125 440ms 28 Mar 2025 859th MeWhenI 🇻🇦 865 101 25ms 21 Feb 2023 860th MeWhenI 🇻🇦 863 81 452ms 7 Nov 2025 861st sisyphus-ppcg 🇦🇺 863 103 268ms 8 Aug 2022 861st GrayJoKing 🇦🇺 863 103 262ms 14 Aug 2022 863rd JPRuskin 🇬🇧 861 42 4,023ms 26 Apr 2024 863rd 5quiwyrm 861 42 3,942ms 10 Dec 2024 865th NewDefectus 🇮🇱 861 68 2ms 9 Aug 2022 865th Yewzir 🇧🇪 861 68 2ms 10 Apr 2024 865th DialFrost 🇸🇬 861 68 2ms 11 Apr 2025 868th Yewzir 🇧🇪 861 74 341ms 10 Apr 2024 868th b-illy 🇬🇧 861 74 393ms 10 days ago 870th error256 861 78 20ms 24 Jul 2025 871st GrayJoKing 🇦🇺 860 35 31ms 13 Aug 2022 872nd sidok 860 45 460ms 5 May 2024 872nd fuzzylojik-golf 🇺🇸 860 45 360ms 8 Jul 2025 874th pardouin 🇫🇷 859 63 21ms 21 Oct 2024 875th jared-hughes 859 88 75ms 14 Aug 2022 875th MeWhenI 🇻🇦 859 88 70ms 21 Feb 2023 875th Yewzir 🇧🇪 859 88 61ms 10 Apr 2024 875th BlankSpruce 859 88 69ms 13 Nov 2024 875th qwertyuiop3 🇷🇺 859 88 61ms 16 May 2025 880th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 First Prev 801–880 of 2,465 Next Last