The Calendar hole will go live in approximately 10 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 442nd gXLg 🇩🇪 939 46 9ms 23 Sep 2023 442nd ridingqwerty 🇺🇸 939 46 9ms 22 Dec 2023 442nd bzijlema 🇳🇱 939 46 9ms 12 Jan 2024 442nd jhu04 939 46 9ms 18 Jan 2024 442nd bob-th 939 46 9ms 2 Feb 2024 442nd Bmrl7 939 46 9ms 21 Feb 2024 442nd elgan65536 939 46 9ms 5 Mar 2024 442nd Lewenhaupt 939 46 9ms 22 Mar 2024 442nd jmfk 939 46 9ms 22 Mar 2024 442nd jtaxen 939 46 9ms 5 Apr 2024 442nd dokutan 939 46 9ms 30 Apr 2024 442nd 5cw 🇺🇸 939 46 10ms 5 May 2024 442nd bizy-coder 939 46 10ms 15 Aug 2024 442nd jatloe 939 46 9ms 26 Aug 2024 442nd croc54 939 46 9ms 18 Nov 2024 442nd lifthrasiir 🇰🇷 939 46 9ms 3 Dec 2024 442nd andrewjc2000 939 46 9ms 3 Mar 2025 442nd plcc0 939 46 9ms 5 Mar 2025 442nd keelimeguy 🇺🇸 939 46 9ms 6 May 2025 442nd Artemis21 🇬🇧 939 46 9ms 23 May 2025 442nd dirckvdende 939 46 9ms 20 Jul 2025 442nd qpwoeirut 939 46 9ms 13 Aug 2025 442nd InigoK 🇺🇸 939 46 9ms 8 Sep 2025 442nd blaztoma 🇱🇹 939 46 9ms 15 Sep 2025 442nd ahmetdemirag 🇨🇾 939 46 9ms 1 Oct 2025 442nd luuumine 🇫🇷 939 46 9ms 17 Oct 2025 442nd butnaruteodor 939 46 9ms 30 Oct 2025 442nd CommandLeo 🇮🇹 939 46 10ms 15 Nov 2025 442nd Languag3 939 46 9ms 16 days ago 442nd zgialor-lab 939 46 14ms 3 days ago 511th rak1507 🇬🇧 938 21 2ms 12 Jan 2022 511th Garklein 🇨🇦 938 21 2ms 15 Jan 2022 511th Bubbler-4 938 21 2ms 16 Jan 2022 511th HPWiz 🇳🇿 938 21 2ms 18 Jan 2022 511th GrayJoKing 🇦🇺 938 21 2ms 2 Feb 2022 511th lynn 938 21 3ms 2 Jun 2022 511th shadowninja55 🇺🇸 938 21 2ms 28 Dec 2022 511th DialFrost 🇸🇬 938 21 2ms 2 Feb 2024 511th SirBogman 🇺🇸 938 21 2ms 12 Feb 2024 511th bstrat 938 21 2ms 5 Aug 2024 511th copy 938 21 2ms 16 Aug 2024 511th zacjl 938 21 2ms 17 Aug 2024 511th Steffan153 🇫🇮 938 21 2ms 18 Aug 2024 511th sean-niemann 🇺🇸 938 21 2ms 11 Apr 2025 511th pardouin 🇫🇷 938 21 2ms 15 Apr 2025 511th fuzzylojik-golf 🇺🇸 938 21 2ms 6 Sep 2025 527th sisyphus-ppcg 🇦🇺 937 33 4ms 12 Aug 2024 527th ovs-code 🇩🇪 937 33 4ms 20 Aug 2024 527th emgordon154 937 33 4ms 15 Nov 2024 530th primo-ppcg 🇹🇭 937 44 84ms 18 Jan 2020 530th prplz 🇦🇺 937 44 85ms 15 Aug 2020 530th JayXon 🇺🇸 937 44 82ms 16 Feb 2021 530th Lydxn 🇨🇦 937 44 83ms 18 Aug 2021 530th stefangimmillaro 937 44 83ms 21 Aug 2023 535th DialFrost 🇸🇬 935 38 1ms 18 Nov 2025 535th Yewzir 🇧🇪 935 38 1ms 18 Nov 2025 535th rucin93 🇵🇱 935 38 1ms 18 Nov 2025 535th edsrzf 🇳🇿 935 38 1ms 18 Nov 2025 535th JayXon 🇺🇸 935 38 1ms 19 Nov 2025 535th sean-niemann 🇺🇸 935 38 1ms 19 Nov 2025 535th GrayJoKing 🇦🇺 935 38 1ms 19 Nov 2025 535th ovs-code 🇩🇪 935 38 1ms 19 Nov 2025 535th Shanethegamer 🇺🇸 935 38 2ms 19 Nov 2025 535th pardouin 🇫🇷 935 38 1ms 19 Nov 2025 535th snoozingnewt 🇨🇦 935 38 1ms 17 days ago 546th primo-ppcg 🇹🇭 935 44 117ms 25 Apr 2020 546th prplz 🇦🇺 935 44 118ms 16 May 2020 546th Lydxn 🇨🇦 935 44 120ms 12 Jan 2021 546th JayXon 🇺🇸 935 44 118ms 16 Feb 2021 546th sisyphus-ppcg 🇦🇺 935 44 120ms 30 May 2021 546th ovs-code 🇩🇪 935 44 118ms 19 Nov 2021 546th GrayJoKing 🇦🇺 935 44 118ms 15 Dec 2021 546th MichalMarsalek 🇨🇿 935 44 120ms 16 Feb 2022 546th lynn 935 44 119ms 3 Jun 2022 546th MeWhenI 🇻🇦 935 44 117ms 10 Oct 2022 546th clockworknazo 935 44 117ms 26 Nov 2022 546th Steffan153 🇫🇮 935 44 116ms 30 Nov 2022 546th sean-niemann 🇺🇸 935 44 120ms 17 Jan 2023 546th DialFrost 🇸🇬 935 44 117ms 18 Jan 2023 546th steffan-polygolf 935 44 117ms 19 Feb 2023 First Prev 481–560 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