The Calendar hole will go live in approximately 13 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 440th bzijlema 🇳🇱 939 46 9ms 12 Jan 2024 440th jhu04 939 46 9ms 18 Jan 2024 440th bob-th 939 46 9ms 2 Feb 2024 440th Bmrl7 939 46 9ms 21 Feb 2024 440th elgan65536 939 46 9ms 5 Mar 2024 440th Lewenhaupt 939 46 9ms 22 Mar 2024 440th jmfk 939 46 9ms 22 Mar 2024 440th jtaxen 939 46 9ms 5 Apr 2024 440th dokutan 939 46 9ms 30 Apr 2024 440th 5cw 🇺🇸 939 46 10ms 5 May 2024 440th bizy-coder 939 46 10ms 15 Aug 2024 440th jatloe 939 46 9ms 26 Aug 2024 440th croc54 939 46 9ms 18 Nov 2024 440th lifthrasiir 🇰🇷 939 46 9ms 3 Dec 2024 440th andrewjc2000 939 46 9ms 3 Mar 2025 440th plcc0 939 46 9ms 5 Mar 2025 440th keelimeguy 🇺🇸 939 46 9ms 6 May 2025 440th Artemis21 🇬🇧 939 46 9ms 23 May 2025 440th dirckvdende 939 46 9ms 20 Jul 2025 440th qpwoeirut 939 46 9ms 13 Aug 2025 440th InigoK 🇺🇸 939 46 9ms 8 Sep 2025 440th blaztoma 🇱🇹 939 46 9ms 15 Sep 2025 440th ahmetdemirag 🇨🇾 939 46 9ms 1 Oct 2025 440th luuumine 🇫🇷 939 46 9ms 17 Oct 2025 440th butnaruteodor 939 46 9ms 30 Oct 2025 440th CommandLeo 🇮🇹 939 46 10ms 15 Nov 2025 440th Languag3 939 46 9ms 13 days ago 440th zgialor-lab 939 46 14ms 23 hours ago 509th rak1507 🇬🇧 938 21 2ms 12 Jan 2022 509th Garklein 🇨🇦 938 21 2ms 15 Jan 2022 509th Bubbler-4 938 21 2ms 16 Jan 2022 509th HPWiz 🇳🇿 938 21 2ms 18 Jan 2022 509th GrayJoKing 🇦🇺 938 21 2ms 2 Feb 2022 509th lynn 938 21 3ms 2 Jun 2022 509th shadowninja55 🇺🇸 938 21 2ms 28 Dec 2022 509th DialFrost 🇸🇬 938 21 2ms 2 Feb 2024 509th SirBogman 🇺🇸 938 21 2ms 12 Feb 2024 509th bstrat 938 21 2ms 5 Aug 2024 509th copy 938 21 2ms 16 Aug 2024 509th zacjl 938 21 2ms 17 Aug 2024 509th Steffan153 🇫🇮 938 21 2ms 18 Aug 2024 509th sean-niemann 🇺🇸 938 21 2ms 11 Apr 2025 509th pardouin 🇫🇷 938 21 2ms 15 Apr 2025 509th fuzzylojik-golf 🇺🇸 938 21 2ms 6 Sep 2025 525th sisyphus-ppcg 🇦🇺 937 33 4ms 12 Aug 2024 525th ovs-code 🇩🇪 937 33 4ms 20 Aug 2024 525th emgordon154 937 33 4ms 15 Nov 2024 528th primo-ppcg 🇹🇭 937 44 84ms 18 Jan 2020 528th prplz 🇦🇺 937 44 85ms 15 Aug 2020 528th JayXon 🇺🇸 937 44 82ms 16 Feb 2021 528th Lydxn 🇨🇦 937 44 83ms 18 Aug 2021 528th stefangimmillaro 937 44 83ms 21 Aug 2023 533rd DialFrost 🇸🇬 935 38 1ms 18 Nov 2025 533rd Yewzir 🇧🇪 935 38 1ms 18 Nov 2025 533rd rucin93 🇵🇱 935 38 1ms 18 Nov 2025 533rd edsrzf 🇳🇿 935 38 1ms 18 Nov 2025 533rd JayXon 🇺🇸 935 38 1ms 19 Nov 2025 533rd sean-niemann 🇺🇸 935 38 1ms 19 Nov 2025 533rd GrayJoKing 🇦🇺 935 38 1ms 19 Nov 2025 533rd ovs-code 🇩🇪 935 38 1ms 19 Nov 2025 533rd Shanethegamer 🇺🇸 935 38 2ms 19 Nov 2025 533rd pardouin 🇫🇷 935 38 1ms 19 Nov 2025 533rd snoozingnewt 🇨🇦 935 38 1ms 14 days ago 544th primo-ppcg 🇹🇭 935 44 117ms 25 Apr 2020 544th prplz 🇦🇺 935 44 118ms 16 May 2020 544th Lydxn 🇨🇦 935 44 120ms 12 Jan 2021 544th JayXon 🇺🇸 935 44 118ms 16 Feb 2021 544th sisyphus-ppcg 🇦🇺 935 44 120ms 30 May 2021 544th ovs-code 🇩🇪 935 44 118ms 19 Nov 2021 544th GrayJoKing 🇦🇺 935 44 118ms 15 Dec 2021 544th MichalMarsalek 🇨🇿 935 44 120ms 16 Feb 2022 544th lynn 935 44 119ms 3 Jun 2022 544th MeWhenI 🇻🇦 935 44 117ms 10 Oct 2022 544th clockworknazo 935 44 117ms 26 Nov 2022 544th Steffan153 🇫🇮 935 44 116ms 30 Nov 2022 544th sean-niemann 🇺🇸 935 44 120ms 17 Jan 2023 544th DialFrost 🇸🇬 935 44 117ms 18 Jan 2023 544th steffan-polygolf 935 44 117ms 19 Feb 2023 544th Shanethegamer 🇺🇸 935 44 117ms 8 Mar 2023 544th stefangimmillaro 935 44 119ms 11 Jun 2023 First 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