The Calendar hole will go live in approximately 8 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 792nd randolchance 871 56 16ms 9 Feb 2023 792nd TaserTheFox 🇺🇸 871 56 16ms 7 Apr 2023 792nd TheoKeller1 871 56 15ms 11 Jun 2023 792nd BREMAUCY 🇫🇷 871 56 17ms 13 Jul 2023 792nd cros107 🇦🇺 871 56 16ms 21 Jul 2023 792nd primo-ppcg 🇹🇭 871 56 149ms 3 Aug 2023 792nd FortuiteMan 🇫🇷 871 56 20ms 23 Sep 2023 792nd minhtrancccp 871 56 17ms 17 Oct 2023 792nd mikehanus 871 56 18ms 22 Nov 2023 792nd zwxzwxzwx21 871 56 16ms 30 Jan 2024 792nd NickTheEASDude 🇺🇸 871 56 16ms 9 Apr 2024 792nd wuzekai518 871 56 15ms 19 Jul 2024 792nd codingisgreatbutiamnot 871 56 15ms 7 Aug 2024 792nd alemelis 871 56 18ms 31 Aug 2024 792nd hiichbindermax 871 56 16ms 16 Sep 2024 792nd Powerroff 871 56 17ms 11 Nov 2024 792nd Europe2048 871 56 22ms 24 Nov 2024 792nd ApoChagi 871 56 16ms 17 Oct 2025 792nd butnaruteodor 871 56 20ms 30 Oct 2025 820th JDiLenarda 🇫🇷 871 67 1,288ms 7 Dec 2023 821st primo-ppcg 🇹🇭 871 102 268ms 4 Sep 2022 821st m-tkach 🇺🇦 871 102 266ms 14 Jun 2023 821st DialFrost 🇸🇬 871 102 258ms 11 Apr 2025 821st CaedenHarper 🇨🇦 871 102 342ms 15 days ago 825th JayXon 🇺🇸 871 133 1,655ms 15 Sep 2025 826th DialFrost 🇸🇬 870 46 1,928ms 21 Jan 2025 827th DialFrost 🇸🇬 870 52 363ms 15 Jan 2024 827th prplz 🇦🇺 870 52 360ms 15 Jan 2024 827th dokutan 870 52 371ms 1 May 2024 827th lifthrasiir 🇰🇷 870 52 350ms 2 Dec 2024 827th albanian-laundromat 870 52 352ms 25 Aug 2025 832nd jared-hughes 870 165 26ms 18 Dec 2024 833rd pschmid0 🇺🇸 869 54 10ms 8 Aug 2022 833rd oddvalue 869 54 7ms 24 Aug 2022 833rd Stopi 869 54 8ms 1 Sep 2022 833rd janbehrens 🇩🇪 869 54 7ms 27 Nov 2022 833rd DialFrost 🇸🇬 869 54 11ms 6 Feb 2023 833rd Steffan153 🇫🇮 869 54 8ms 27 Mar 2023 833rd stefangimmillaro 869 54 10ms 15 Oct 2023 833rd sean-niemann 🇺🇸 869 54 7ms 4 Nov 2023 841st sisyphus-ppcg 🇦🇺 869 62 108ms 11 Aug 2022 841st Yewzir 🇧🇪 869 62 119ms 10 Apr 2024 841st sean-niemann 🇺🇸 869 62 95ms 27 Apr 2024 841st pardouin 🇫🇷 869 62 90ms 21 Oct 2024 841st DialFrost 🇸🇬 869 62 102ms 11 Apr 2025 841st fuzzylojik-golf 🇺🇸 869 62 93ms 29 Aug 2025 847th DialFrost 🇸🇬 869 87 78ms 11 Apr 2025 848th DialFrost 🇸🇬 868 88 45ms 11 Apr 2025 848th pardouin 🇫🇷 868 88 50ms 25 Apr 2025 850th MeWhenI 🇻🇦 867 95 15ms 21 Feb 2023 850th Yewzir 🇧🇪 867 95 15ms 4 May 2024 852nd Steffan153 🇫🇮 866 66 40ms 28 Jul 2024 852nd pardouin 🇫🇷 866 66 42ms 17 Mar 2025 852nd DialFrost 🇸🇬 866 66 40ms 11 Apr 2025 855th MeWhenI 🇻🇦 866 125 440ms 28 Mar 2025 856th MeWhenI 🇻🇦 865 101 25ms 21 Feb 2023 857th MeWhenI 🇻🇦 863 81 452ms 7 Nov 2025 858th sisyphus-ppcg 🇦🇺 863 103 268ms 8 Aug 2022 858th GrayJoKing 🇦🇺 863 103 262ms 14 Aug 2022 860th JPRuskin 🇬🇧 861 42 4,023ms 26 Apr 2024 860th 5quiwyrm 861 42 3,942ms 10 Dec 2024 862nd NewDefectus 🇮🇱 861 68 2ms 9 Aug 2022 862nd Yewzir 🇧🇪 861 68 2ms 10 Apr 2024 862nd DialFrost 🇸🇬 861 68 2ms 11 Apr 2025 865th Yewzir 🇧🇪 861 74 341ms 10 Apr 2024 865th b-illy 🇬🇧 861 74 393ms 15 days ago 867th error256 861 78 20ms 24 Jul 2025 868th GrayJoKing 🇦🇺 860 35 31ms 13 Aug 2022 869th sidok 860 45 460ms 5 May 2024 869th fuzzylojik-golf 🇺🇸 860 45 360ms 8 Jul 2025 871st pardouin 🇫🇷 859 63 21ms 21 Oct 2024 872nd jared-hughes 859 88 75ms 14 Aug 2022 872nd MeWhenI 🇻🇦 859 88 70ms 21 Feb 2023 872nd Yewzir 🇧🇪 859 88 61ms 10 Apr 2024 872nd BlankSpruce 859 88 69ms 13 Nov 2024 872nd qwertyuiop3 🇷🇺 859 88 61ms 16 May 2025 877th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 878th MeWhenI 🇻🇦 859 187 555ms 19 Apr 2025 879th GrayJoKing 🇦🇺 858 67 183ms 8 Aug 2022 879th Natanaelel 🇸🇪 858 67 193ms 9 Aug 2022 First Prev 801–880 of 2,461 Next Last