The Calendar hole will go live in approximately 5 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 877th pardouin 🇫🇷 859 67 189ms 19 Mar 2025 882nd jared-hughes 859 88 61ms 14 Aug 2022 882nd MeWhenI 🇻🇦 859 88 65ms 21 Feb 2023 882nd Yewzir 🇧🇪 859 88 58ms 10 Apr 2024 882nd BlankSpruce 859 88 64ms 13 Nov 2024 882nd qwertyuiop3 🇷🇺 859 88 61ms 16 May 2025 887th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 888th MeWhenI 🇻🇦 859 187 555ms 19 Apr 2025 889th Shanethegamer 🇺🇸 858 90 136ms 15 Apr 2025 889th emgordon154 858 90 122ms 27 days ago 891st sisyphus-ppcg 🇦🇺 858 96 15ms 15 Nov 2022 892nd uttumuttu 🇫🇮 857 56 11ms 8 Aug 2022 892nd AlephSquirrel 857 56 11ms 15 Feb 2023 892nd ejini6969 857 56 35ms 2 Apr 2023 895th gifti258 857 59 74ms 15 Sep 2023 896th Lydxn 🇨🇦 857 60 132ms 9 Aug 2022 896th Shanethegamer 🇺🇸 857 60 126ms 9 Aug 2022 896th Steffan153 🇫🇮 857 60 131ms 6 Dec 2022 896th jipsong 🇩🇪 857 60 131ms 6 May 2025 900th Bubbler-4 857 83 118ms 8 Aug 2022 900th elgan65536 857 83 121ms 11 Apr 2024 900th luuumine 🇫🇷 857 83 119ms 11 Nov 2025 903rd Yewzir 🇧🇪 857 102 24ms 10 Apr 2024 904th inventshah 856 54 97ms 12 Dec 2022 904th MeWhenI 🇻🇦 856 54 92ms 13 Dec 2022 904th Alessandro-Balconi 🇮🇹 856 54 94ms 15 Jul 2023 907th betaveros 856 57 15ms 8 Aug 2022 907th zacharybarbanell 856 57 15ms 8 Aug 2022 907th andre-lameirinhas 🇵🇹 856 57 16ms 8 Aug 2022 907th Bonjour27891 🇻🇳 856 57 235ms 10 Aug 2022 907th RYNO8 856 57 238ms 16 Aug 2022 907th galloj 🇨🇿 856 57 15ms 18 Aug 2022 907th commandblockguy 🇺🇸 856 57 16ms 27 Aug 2022 907th Eilonlif 🇮🇱 856 57 18ms 9 Sep 2022 907th MaxElf999 856 57 15ms 23 Sep 2022 907th fredrik-bakke 🇳🇴 856 57 16ms 2 Oct 2022 907th aiarzhantsev 856 57 16ms 14 Oct 2022 907th trist224 🇫🇷 856 57 235ms 18 Oct 2022 907th Stockoh 🇫🇷 856 57 240ms 21 Oct 2022 907th andersk 🇺🇸 856 57 16ms 25 Oct 2022 907th fourth-bit 856 57 235ms 6 Dec 2022 907th quimey 856 57 18ms 8 Mar 2023 907th aksyristos 856 57 16ms 11 Mar 2023 907th CedricGebistorf 856 57 16ms 4 May 2023 907th ehulinsky 🇺🇸 856 57 16ms 7 May 2023 907th Griff95 856 57 237ms 21 Sep 2023 907th inverseLorentz 🇦🇺 856 57 17ms 18 Feb 2024 907th sultan 856 57 234ms 3 Mar 2024 907th AminurAlam 856 57 18ms 20 Mar 2024 907th EnTerr 856 57 15ms 1 Sep 2024 907th logvp 856 57 230ms 7 Oct 2024 907th moustave 856 57 16ms 26 Nov 2024 907th nooberitess 856 57 16ms 22 May 2025 907th dirckvdende 856 57 15ms 5 Jul 2025 907th xDragoxboi 856 57 16ms 6 Jul 2025 907th Mikey-Beep 🇬🇧 856 57 16ms 25 Jul 2025 907th shelerr 856 57 234ms 21 Aug 2025 907th CommandLeo 🇮🇹 856 57 16ms 12 Nov 2025 939th inventshah 856 58 4ms 15 Jan 2024 940th Lydxn 🇨🇦 855 53 135ms 6 Aug 2024 940th emgordon154 855 53 135ms 17 Nov 2024 942nd GrayJoKing 🇦🇺 855 63 94ms 14 Aug 2022 942nd primo-ppcg 🇹🇭 855 63 94ms 4 Sep 2022 942nd MeWhenI 🇻🇦 855 63 114ms 21 Feb 2023 945th SirBogman 🇺🇸 853 53 360ms 16 Jan 2024 945th namelessiw 853 53 356ms 5 Mar 2024 945th commandblockguy 🇺🇸 853 53 343ms 1 Sep 2025 945th snoozingnewt 🇨🇦 853 53 381ms 21 Nov 2025 949th KrausRaus 🇺🇸 853 55 7ms 12 Aug 2022 949th josh-h-90 853 55 7ms 9 Sep 2022 951st GrayJoKing 🇦🇺 853 67 40ms 14 Aug 2022 951st stefangimmillaro 853 67 39ms 15 Apr 2023 951st MeWhenI 🇻🇦 853 67 39ms 10 May 2023 954th DialFrost 🇸🇬 852 136 1,668ms 13 Sep 2025 954th Yewzir 🇧🇪 852 136 2,463ms 14 Nov 2025 956th MeWhenI 🇻🇦 851 71 101ms 21 Feb 2023 957th Ripick 850 67 216ms 6 Jan 2023 958th KasperKivimaeki 🇫🇮 850 89 63ms 26 Oct 2025 959th DialFrost 🇸🇬 850 189 59ms 13 Aug 2025 960th primo-ppcg 🇹🇭 849 75 336ms 4 Sep 2022 First Prev 881–960 of 2,469 Next Last