The Calendar hole will go live in approximately 8 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 437th Bmrl7 939 46 9ms 21 Feb 2024 437th elgan65536 939 46 9ms 5 Mar 2024 437th Lewenhaupt 939 46 9ms 22 Mar 2024 437th jmfk 939 46 9ms 22 Mar 2024 437th jtaxen 939 46 9ms 5 Apr 2024 437th dokutan 939 46 9ms 30 Apr 2024 437th 5cw 🇺🇸 939 46 10ms 5 May 2024 437th bizy-coder 939 46 10ms 15 Aug 2024 437th jatloe 939 46 9ms 26 Aug 2024 437th croc54 939 46 9ms 18 Nov 2024 437th lifthrasiir 🇰🇷 939 46 9ms 3 Dec 2024 437th andrewjc2000 939 46 9ms 3 Mar 2025 437th plcc0 939 46 9ms 5 Mar 2025 437th keelimeguy 🇺🇸 939 46 9ms 6 May 2025 437th Artemis21 🇬🇧 939 46 9ms 23 May 2025 437th dirckvdende 939 46 9ms 20 Jul 2025 437th qpwoeirut 939 46 9ms 13 Aug 2025 437th InigoK 🇺🇸 939 46 9ms 8 Sep 2025 437th blaztoma 🇱🇹 939 46 9ms 15 Sep 2025 437th ahmetdemirag 🇨🇾 939 46 9ms 1 Oct 2025 437th luuumine 🇫🇷 939 46 9ms 17 Oct 2025 437th butnaruteodor 939 46 9ms 30 Oct 2025 437th CommandLeo 🇮🇹 939 46 10ms 15 Nov 2025 437th Languag3 939 46 9ms 18 days ago 437th zgialor-lab 939 46 14ms 5 days ago 506th rak1507 🇬🇧 938 21 2ms 12 Jan 2022 506th Garklein 🇨🇦 938 21 2ms 15 Jan 2022 506th Bubbler-4 938 21 2ms 16 Jan 2022 506th HPWiz 🇳🇿 938 21 2ms 18 Jan 2022 506th GrayJoKing 🇦🇺 938 21 2ms 2 Feb 2022 506th lynn 938 21 3ms 2 Jun 2022 506th shadowninja55 🇺🇸 938 21 2ms 28 Dec 2022 506th DialFrost 🇸🇬 938 21 2ms 2 Feb 2024 506th SirBogman 🇺🇸 938 21 2ms 12 Feb 2024 506th bstrat 938 21 2ms 5 Aug 2024 506th copy 938 21 2ms 16 Aug 2024 506th zacjl 938 21 2ms 17 Aug 2024 506th Steffan153 🇫🇮 938 21 2ms 18 Aug 2024 506th sean-niemann 🇺🇸 938 21 2ms 11 Apr 2025 506th pardouin 🇫🇷 938 21 2ms 15 Apr 2025 506th fuzzylojik-golf 🇺🇸 938 21 2ms 6 Sep 2025 522nd sisyphus-ppcg 🇦🇺 937 33 4ms 12 Aug 2024 522nd ovs-code 🇩🇪 937 33 4ms 20 Aug 2024 522nd emgordon154 937 33 4ms 15 Nov 2024 525th primo-ppcg 🇹🇭 937 44 84ms 18 Jan 2020 525th prplz 🇦🇺 937 44 85ms 15 Aug 2020 525th JayXon 🇺🇸 937 44 82ms 16 Feb 2021 525th Lydxn 🇨🇦 937 44 83ms 18 Aug 2021 525th stefangimmillaro 937 44 83ms 21 Aug 2023 530th DialFrost 🇸🇬 935 38 1ms 18 Nov 2025 530th Yewzir 🇧🇪 935 38 1ms 18 Nov 2025 530th rucin93 🇵🇱 935 38 1ms 18 Nov 2025 530th edsrzf 🇳🇿 935 38 1ms 18 Nov 2025 530th JayXon 🇺🇸 935 38 1ms 19 Nov 2025 530th sean-niemann 🇺🇸 935 38 1ms 19 Nov 2025 530th GrayJoKing 🇦🇺 935 38 1ms 19 Nov 2025 530th ovs-code 🇩🇪 935 38 1ms 19 Nov 2025 530th Shanethegamer 🇺🇸 935 38 2ms 19 Nov 2025 530th pardouin 🇫🇷 935 38 1ms 19 Nov 2025 530th snoozingnewt 🇨🇦 935 38 1ms 19 days ago 541st primo-ppcg 🇹🇭 935 44 117ms 25 Apr 2020 541st prplz 🇦🇺 935 44 118ms 16 May 2020 541st Lydxn 🇨🇦 935 44 120ms 12 Jan 2021 541st JayXon 🇺🇸 935 44 118ms 16 Feb 2021 541st sisyphus-ppcg 🇦🇺 935 44 120ms 30 May 2021 541st ovs-code 🇩🇪 935 44 118ms 19 Nov 2021 541st GrayJoKing 🇦🇺 935 44 118ms 15 Dec 2021 541st MichalMarsalek 🇨🇿 935 44 120ms 16 Feb 2022 541st lynn 935 44 119ms 3 Jun 2022 541st MeWhenI 🇻🇦 935 44 117ms 10 Oct 2022 541st clockworknazo 935 44 117ms 26 Nov 2022 541st Steffan153 🇫🇮 935 44 116ms 30 Nov 2022 541st sean-niemann 🇺🇸 935 44 120ms 17 Jan 2023 541st DialFrost 🇸🇬 935 44 117ms 18 Jan 2023 541st steffan-polygolf 935 44 117ms 19 Feb 2023 541st Shanethegamer 🇺🇸 935 44 117ms 8 Mar 2023 541st stefangimmillaro 935 44 119ms 11 Jun 2023 541st Yewzir 🇧🇪 935 44 118ms 23 Sep 2023 541st Betuaredead 935 44 119ms 13 Nov 2023 541st pardouin 🇫🇷 935 44 126ms 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