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 790th DialFrost 🇸🇬 922 49 13ms 24 Mar 2025 790th sean-niemann 🇺🇸 922 49 13ms 25 Mar 2025 790th GolfingSuccess 🇬🇷 922 49 12ms 10 Aug 2025 790th snoozingnewt 🇨🇦 922 49 14ms 10 days ago 805th lynn 922 51 2ms 2 Oct 2021 805th GrayJoKing 🇦🇺 922 51 1ms 5 Feb 2022 805th madex 🇩🇪 922 51 1ms 12 Nov 2022 805th m-tkach 🇺🇦 922 51 1ms 2 Jun 2023 805th roupiq 🇵🇱 922 51 2ms 24 Feb 2024 805th wojtekmal 922 51 1ms 27 Feb 2024 805th Herbert00709 🇵🇱 922 51 1ms 12 Apr 2024 812th prplz 🇦🇺 921 43 331ms 15 Jan 2024 812th AlephSquirrel 921 43 341ms 16 Jan 2024 812th neel11235813 921 43 347ms 17 Jan 2024 812th lynn 921 43 368ms 17 Feb 2024 812th CaedenHarper 🇨🇦 921 43 333ms 6 Sep 2024 812th rucin93 🇵🇱 921 43 400ms 26 Sep 2024 812th GolfingSuccess 🇬🇷 921 43 357ms 10 Aug 2025 812th CornerMercury 🇬🇧 921 43 361ms 30 hours ago 820th Lydxn 🇨🇦 921 47 5ms 20 Dec 2023 821st primo-ppcg 🇹🇭 921 49 39ms 6 May 2020 821st marshallward 🇺🇸 921 49 39ms 12 Oct 2020 821st LucaArgentiUCF 🇮🇹 921 49 38ms 14 Feb 2021 821st cure-honey 🇯🇵 921 49 39ms 26 Jun 2021 821st Lydxn 🇨🇦 921 49 40ms 15 Jul 2021 821st snoozingnewt 🇨🇦 921 49 38ms 7 days ago 827th Lydxn 🇨🇦 920 46 3ms 16 Jul 2023 828th sean-niemann 🇺🇸 919 40 651ms 12 Sep 2025 828th edsrzf 🇳🇿 919 40 662ms 13 Sep 2025 828th xsot 🇸🇬 919 40 723ms 12 Nov 2025 828th snoozingnewt 🇨🇦 919 40 651ms 8 days ago 832nd deflatSOCO 919 47 9ms 11 Apr 2019 832nd andre-lameirinhas 🇵🇹 919 47 9ms 27 Apr 2020 832nd ToriTheChicken 919 47 10ms 26 Jul 2020 832nd thisishowmymindworks 🇳🇴 919 47 13ms 26 Jul 2020 832nd JeromeSchweitzer 919 47 9ms 7 Sep 2020 832nd Maltysen 919 47 9ms 26 Sep 2020 832nd ToonAlfrink 919 47 9ms 13 Nov 2020 832nd 77Tigers 919 47 8ms 1 Mar 2021 832nd ydevor 🇮🇱 919 47 9ms 11 Mar 2021 832nd abba23 919 47 9ms 14 Jun 2021 832nd jacklynnepenick 919 47 9ms 19 Aug 2021 832nd ehulinsky 🇺🇸 919 47 9ms 10 Nov 2021 832nd xy3 🇮🇪 919 47 11ms 19 Nov 2021 832nd chartung17 919 47 9ms 5 Dec 2021 832nd krcs 🇵🇱 919 47 11ms 29 Dec 2021 832nd anter69 🇭🇺 919 47 9ms 9 Mar 2022 832nd CedricGebistorf 919 47 9ms 11 Mar 2022 832nd tkr-sh 🇰🇵 919 47 11ms 12 May 2022 832nd wen1now 919 47 9ms 8 Aug 2022 832nd betaveros 919 47 10ms 9 Aug 2022 832nd 5quiwyrm 919 47 9ms 16 Aug 2022 832nd Eilonlif 🇮🇱 919 47 9ms 3 Sep 2022 832nd commandblockguy 🇺🇸 919 47 9ms 18 Sep 2022 832nd aiarzhantsev 919 47 12ms 14 Oct 2022 832nd nstearns96 🇬🇧 919 47 11ms 6 Jan 2023 832nd quimey 919 47 9ms 8 Mar 2023 832nd aksyristos 919 47 9ms 11 Mar 2023 832nd ejini6969 919 47 11ms 25 Mar 2023 832nd 2011-Chan-Ethan 919 47 9ms 19 Jul 2023 832nd Griff95 919 47 11ms 21 Sep 2023 832nd firegene 🇮🇪 919 47 9ms 15 Oct 2023 832nd mikehanus 919 47 9ms 29 Jan 2024 832nd ThijsLuttikhuis 919 47 9ms 6 Mar 2024 832nd markusgraube 919 47 9ms 9 Mar 2024 832nd AminurAlam 919 47 9ms 20 Mar 2024 832nd SB-945 919 47 9ms 31 Mar 2024 832nd tri1212 🇻🇳 919 47 9ms 15 Jul 2024 832nd codingisgreatbutiamnot 919 47 9ms 20 Jul 2024 832nd Terobero 919 47 12ms 23 Aug 2024 832nd LostSyntax21 🇬🇧 919 47 9ms 3 Sep 2024 832nd KingSkyrock 🇺🇸 919 47 10ms 14 Oct 2024 832nd Stockoh 🇫🇷 919 47 11ms 17 Nov 2024 832nd Europe2048 919 47 9ms 26 Nov 2024 832nd CLOStrophobic 🇮🇹 919 47 9ms 20 Jan 2025 832nd agreegious 919 47 10ms 16 Mar 2025 832nd moustave 919 47 9ms 11 Apr 2025 832nd zacjl 919 47 10ms 3 Jul 2025 832nd RaBa21 🇭🇺 919 47 11ms 18 Jul 2025 832nd janlelis 919 47 9ms 15 Aug 2025 First Prev 801–880 of 4,111 Next Last