The Calendar hole will go live in approximately 6 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 795th edsrzf 🇳🇿 871 56 17ms 3 mins ago 824th JDiLenarda 🇫🇷 871 67 1,288ms 7 Dec 2023 825th primo-ppcg 🇹🇭 871 102 268ms 4 Sep 2022 825th m-tkach 🇺🇦 871 102 266ms 14 Jun 2023 825th DialFrost 🇸🇬 871 102 258ms 11 Apr 2025 825th CaedenHarper 🇨🇦 871 102 342ms 16 days ago 829th JayXon 🇺🇸 871 133 1,655ms 15 Sep 2025 830th DialFrost 🇸🇬 870 46 1,800ms 21 Jan 2025 831st DialFrost 🇸🇬 870 52 363ms 15 Jan 2024 831st prplz 🇦🇺 870 52 360ms 15 Jan 2024 831st dokutan 870 52 371ms 1 May 2024 831st lifthrasiir 🇰🇷 870 52 350ms 2 Dec 2024 831st albanian-laundromat 870 52 352ms 25 Aug 2025 836th jared-hughes 870 165 26ms 18 Dec 2024 837th pschmid0 🇺🇸 869 54 7ms 8 Aug 2022 837th oddvalue 869 54 7ms 24 Aug 2022 837th Stopi 869 54 7ms 1 Sep 2022 837th janbehrens 🇩🇪 869 54 7ms 27 Nov 2022 837th DialFrost 🇸🇬 869 54 7ms 6 Feb 2023 837th Steffan153 🇫🇮 869 54 7ms 27 Mar 2023 837th stefangimmillaro 869 54 8ms 15 Oct 2023 837th sean-niemann 🇺🇸 869 54 6ms 4 Nov 2023 845th sisyphus-ppcg 🇦🇺 869 62 108ms 11 Aug 2022 845th Yewzir 🇧🇪 869 62 119ms 10 Apr 2024 845th sean-niemann 🇺🇸 869 62 95ms 27 Apr 2024 845th pardouin 🇫🇷 869 62 90ms 21 Oct 2024 845th DialFrost 🇸🇬 869 62 102ms 11 Apr 2025 845th fuzzylojik-golf 🇺🇸 869 62 93ms 29 Aug 2025 851st DialFrost 🇸🇬 869 87 57ms 11 Apr 2025 852nd DialFrost 🇸🇬 868 88 45ms 11 Apr 2025 852nd pardouin 🇫🇷 868 88 49ms 25 Apr 2025 854th MeWhenI 🇻🇦 867 95 15ms 21 Feb 2023 854th Yewzir 🇧🇪 867 95 15ms 4 May 2024 856th Steffan153 🇫🇮 866 66 40ms 28 Jul 2024 856th pardouin 🇫🇷 866 66 42ms 17 Mar 2025 856th DialFrost 🇸🇬 866 66 40ms 11 Apr 2025 859th MeWhenI 🇻🇦 866 125 440ms 28 Mar 2025 860th MeWhenI 🇻🇦 865 101 25ms 21 Feb 2023 861st MeWhenI 🇻🇦 863 81 452ms 7 Nov 2025 862nd sisyphus-ppcg 🇦🇺 863 103 268ms 8 Aug 2022 862nd GrayJoKing 🇦🇺 863 103 262ms 14 Aug 2022 864th JPRuskin 🇬🇧 861 42 4,023ms 26 Apr 2024 864th 5quiwyrm 861 42 3,942ms 10 Dec 2024 866th NewDefectus 🇮🇱 861 68 2ms 9 Aug 2022 866th Yewzir 🇧🇪 861 68 2ms 10 Apr 2024 866th DialFrost 🇸🇬 861 68 2ms 11 Apr 2025 869th Yewzir 🇧🇪 861 74 341ms 10 Apr 2024 869th b-illy 🇬🇧 861 74 393ms 17 days ago 871st error256 861 78 20ms 24 Jul 2025 872nd GrayJoKing 🇦🇺 860 35 31ms 13 Aug 2022 873rd sidok 860 45 401ms 5 May 2024 873rd fuzzylojik-golf 🇺🇸 860 45 281ms 8 Jul 2025 875th pardouin 🇫🇷 859 63 21ms 21 Oct 2024 876th GrayJoKing 🇦🇺 859 67 183ms 8 Aug 2022 876th Natanaelel 🇸🇪 859 67 193ms 9 Aug 2022 876th yzhs 🇩🇪 859 67 190ms 26 Jun 2023 876th cbrt-x 859 67 182ms 30 Aug 2024 876th pardouin 🇫🇷 859 67 189ms 19 Mar 2025 First Prev 801–880 of 2,465 Next Last