The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
Niven Numbers (Long) 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 881st jared-hughes 859 88 61ms 14 Aug 2022 881st MeWhenI 🇻🇦 859 88 65ms 21 Feb 2023 881st Yewzir 🇧🇪 859 88 58ms 10 Apr 2024 881st BlankSpruce 859 88 64ms 13 Nov 2024 881st qwertyuiop3 🇷🇺 859 88 61ms 16 May 2025 886th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 887th MeWhenI 🇻🇦 859 187 555ms 19 Apr 2025 888th Shanethegamer 🇺🇸 858 90 136ms 15 Apr 2025 888th emgordon154 858 90 122ms 26 days ago 890th sisyphus-ppcg 🇦🇺 858 96 15ms 15 Nov 2022 891st uttumuttu 🇫🇮 857 56 11ms 8 Aug 2022 891st AlephSquirrel 857 56 11ms 15 Feb 2023 891st ejini6969 857 56 35ms 2 Apr 2023 894th gifti258 857 59 74ms 15 Sep 2023 895th Bubbler-4 857 83 118ms 8 Aug 2022 895th elgan65536 857 83 121ms 11 Apr 2024 895th luuumine 🇫🇷 857 83 119ms 11 Nov 2025 898th Yewzir 🇧🇪 857 102 24ms 10 Apr 2024 899th inventshah 856 54 97ms 12 Dec 2022 899th MeWhenI 🇻🇦 856 54 92ms 13 Dec 2022 899th Alessandro-Balconi 🇮🇹 856 54 94ms 15 Jul 2023 902nd betaveros 856 57 15ms 8 Aug 2022 902nd zacharybarbanell 856 57 15ms 8 Aug 2022 902nd andre-lameirinhas 🇵🇹 856 57 16ms 8 Aug 2022 902nd Bonjour27891 🇻🇳 856 57 235ms 10 Aug 2022 902nd RYNO8 856 57 238ms 16 Aug 2022 902nd galloj 🇨🇿 856 57 15ms 18 Aug 2022 902nd commandblockguy 🇺🇸 856 57 16ms 27 Aug 2022 902nd Eilonlif 🇮🇱 856 57 18ms 9 Sep 2022 902nd MaxElf999 856 57 15ms 23 Sep 2022 902nd fredrik-bakke 🇳🇴 856 57 16ms 2 Oct 2022 902nd aiarzhantsev 856 57 16ms 14 Oct 2022 902nd trist224 🇫🇷 856 57 235ms 18 Oct 2022 902nd Stockoh 🇫🇷 856 57 240ms 21 Oct 2022 902nd andersk 🇺🇸 856 57 16ms 25 Oct 2022 902nd fourth-bit 856 57 235ms 6 Dec 2022 902nd quimey 856 57 18ms 8 Mar 2023 902nd aksyristos 856 57 16ms 11 Mar 2023 902nd CedricGebistorf 856 57 16ms 4 May 2023 902nd ehulinsky 🇺🇸 856 57 16ms 7 May 2023 902nd Griff95 856 57 237ms 21 Sep 2023 902nd inverseLorentz 🇦🇺 856 57 17ms 18 Feb 2024 902nd sultan 856 57 234ms 3 Mar 2024 902nd AminurAlam 856 57 18ms 20 Mar 2024 902nd EnTerr 856 57 15ms 1 Sep 2024 902nd logvp 856 57 230ms 7 Oct 2024 902nd moustave 856 57 16ms 26 Nov 2024 902nd nooberitess 856 57 16ms 22 May 2025 902nd dirckvdende 856 57 15ms 5 Jul 2025 902nd xDragoxboi 856 57 16ms 6 Jul 2025 902nd Mikey-Beep 🇬🇧 856 57 16ms 25 Jul 2025 902nd shelerr 856 57 234ms 21 Aug 2025 902nd CommandLeo 🇮🇹 856 57 16ms 12 Nov 2025 934th inventshah 856 58 4ms 15 Jan 2024 935th Lydxn 🇨🇦 856 60 132ms 9 Aug 2022 935th Shanethegamer 🇺🇸 856 60 126ms 9 Aug 2022 935th Steffan153 🇫🇮 856 60 131ms 6 Dec 2022 935th jipsong 🇩🇪 856 60 131ms 6 May 2025 939th Lydxn 🇨🇦 855 53 135ms 6 Aug 2024 939th emgordon154 855 53 135ms 17 Nov 2024 941st GrayJoKing 🇦🇺 855 63 94ms 14 Aug 2022 941st primo-ppcg 🇹🇭 855 63 94ms 4 Sep 2022 941st MeWhenI 🇻🇦 855 63 114ms 21 Feb 2023 944th SirBogman 🇺🇸 853 53 360ms 16 Jan 2024 944th namelessiw 853 53 356ms 5 Mar 2024 944th commandblockguy 🇺🇸 853 53 343ms 1 Sep 2025 944th snoozingnewt 🇨🇦 853 53 381ms 21 Nov 2025 948th KrausRaus 🇺🇸 853 55 7ms 12 Aug 2022 948th josh-h-90 853 55 7ms 9 Sep 2022 950th GrayJoKing 🇦🇺 853 67 40ms 14 Aug 2022 950th stefangimmillaro 853 67 39ms 15 Apr 2023 950th MeWhenI 🇻🇦 853 67 39ms 10 May 2023 953rd DialFrost 🇸🇬 852 136 1,668ms 13 Sep 2025 953rd Yewzir 🇧🇪 852 136 2,463ms 14 Nov 2025 955th MeWhenI 🇻🇦 851 71 101ms 21 Feb 2023 956th Ripick 850 67 216ms 6 Jan 2023 957th KasperKivimaeki 🇫🇮 850 89 63ms 26 Oct 2025 958th DialFrost 🇸🇬 850 189 59ms 13 Aug 2025 959th primo-ppcg 🇹🇭 849 75 336ms 4 Sep 2022 959th m-tkach 🇺🇦 849 75 335ms 2 Jun 2023 First Prev 881–960 of 2,465 Next Last