The Calendar hole will go live in approximately 11 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 791st ovs-code 🇩🇪 922 49 13ms 30 Jun 2024 791st DialFrost 🇸🇬 922 49 13ms 24 Mar 2025 791st sean-niemann 🇺🇸 922 49 13ms 25 Mar 2025 791st GolfingSuccess 🇬🇷 922 49 12ms 10 Aug 2025 791st snoozingnewt 🇨🇦 922 49 14ms 12 days ago 806th lynn 922 51 2ms 2 Oct 2021 806th GrayJoKing 🇦🇺 922 51 1ms 5 Feb 2022 806th madex 🇩🇪 922 51 1ms 12 Nov 2022 806th m-tkach 🇺🇦 922 51 1ms 2 Jun 2023 806th roupiq 🇵🇱 922 51 2ms 24 Feb 2024 806th wojtekmal 922 51 1ms 27 Feb 2024 806th Herbert00709 🇵🇱 922 51 1ms 12 Apr 2024 813th prplz 🇦🇺 921 43 331ms 15 Jan 2024 813th AlephSquirrel 921 43 341ms 16 Jan 2024 813th neel11235813 921 43 347ms 17 Jan 2024 813th lynn 921 43 368ms 17 Feb 2024 813th CaedenHarper 🇨🇦 921 43 333ms 6 Sep 2024 813th rucin93 🇵🇱 921 43 400ms 26 Sep 2024 813th GolfingSuccess 🇬🇷 921 43 357ms 10 Aug 2025 813th CornerMercury 🇬🇧 921 43 361ms 3 days ago 821st Lydxn 🇨🇦 921 47 5ms 20 Dec 2023 822nd primo-ppcg 🇹🇭 921 49 39ms 6 May 2020 822nd marshallward 🇺🇸 921 49 39ms 12 Oct 2020 822nd LucaArgentiUCF 🇮🇹 921 49 38ms 14 Feb 2021 822nd cure-honey 🇯🇵 921 49 39ms 26 Jun 2021 822nd Lydxn 🇨🇦 921 49 40ms 15 Jul 2021 822nd snoozingnewt 🇨🇦 921 49 38ms 8 days ago 828th MeWhenI 🇻🇦 920 36 4ms 29 Nov 2022 829th Lydxn 🇨🇦 920 46 3ms 16 Jul 2023 830th sean-niemann 🇺🇸 919 40 651ms 12 Sep 2025 830th edsrzf 🇳🇿 919 40 662ms 13 Sep 2025 830th xsot 🇸🇬 919 40 723ms 12 Nov 2025 830th snoozingnewt 🇨🇦 919 40 651ms 9 days ago 834th deflatSOCO 919 47 9ms 11 Apr 2019 834th andre-lameirinhas 🇵🇹 919 47 9ms 27 Apr 2020 834th ToriTheChicken 919 47 10ms 26 Jul 2020 834th thisishowmymindworks 🇳🇴 919 47 13ms 26 Jul 2020 834th JeromeSchweitzer 919 47 9ms 7 Sep 2020 834th Maltysen 919 47 9ms 26 Sep 2020 834th ToonAlfrink 919 47 9ms 13 Nov 2020 834th 77Tigers 919 47 8ms 1 Mar 2021 834th ydevor 🇮🇱 919 47 9ms 11 Mar 2021 834th abba23 919 47 9ms 14 Jun 2021 834th jacklynnepenick 919 47 9ms 19 Aug 2021 834th ehulinsky 🇺🇸 919 47 9ms 10 Nov 2021 834th xy3 🇮🇪 919 47 11ms 19 Nov 2021 834th chartung17 919 47 9ms 5 Dec 2021 834th krcs 🇵🇱 919 47 11ms 29 Dec 2021 834th anter69 🇭🇺 919 47 9ms 9 Mar 2022 834th CedricGebistorf 919 47 9ms 11 Mar 2022 834th tkr-sh 🇰🇵 919 47 11ms 12 May 2022 834th wen1now 919 47 9ms 8 Aug 2022 834th betaveros 919 47 10ms 9 Aug 2022 834th 5quiwyrm 919 47 9ms 16 Aug 2022 834th Eilonlif 🇮🇱 919 47 9ms 3 Sep 2022 834th commandblockguy 🇺🇸 919 47 9ms 18 Sep 2022 834th aiarzhantsev 919 47 12ms 14 Oct 2022 834th nstearns96 🇬🇧 919 47 11ms 6 Jan 2023 834th quimey 919 47 9ms 8 Mar 2023 834th aksyristos 919 47 9ms 11 Mar 2023 834th ejini6969 919 47 11ms 25 Mar 2023 834th 2011-Chan-Ethan 919 47 9ms 19 Jul 2023 834th Griff95 919 47 11ms 21 Sep 2023 834th firegene 🇮🇪 919 47 9ms 15 Oct 2023 834th mikehanus 919 47 9ms 29 Jan 2024 834th ThijsLuttikhuis 919 47 9ms 6 Mar 2024 834th markusgraube 919 47 9ms 9 Mar 2024 834th AminurAlam 919 47 9ms 20 Mar 2024 834th SB-945 919 47 9ms 31 Mar 2024 834th tri1212 🇻🇳 919 47 9ms 15 Jul 2024 834th codingisgreatbutiamnot 919 47 9ms 20 Jul 2024 834th Terobero 919 47 12ms 23 Aug 2024 834th LostSyntax21 🇬🇧 919 47 9ms 3 Sep 2024 834th KingSkyrock 🇺🇸 919 47 10ms 14 Oct 2024 834th Stockoh 🇫🇷 919 47 11ms 17 Nov 2024 834th Europe2048 919 47 9ms 26 Nov 2024 834th CLOStrophobic 🇮🇹 919 47 9ms 20 Jan 2025 834th agreegious 919 47 10ms 16 Mar 2025 834th moustave 919 47 9ms 11 Apr 2025 834th zacjl 919 47 10ms 3 Jul 2025 First Prev 801–880 of 4,112 Next Last