The Calendar hole will go live in approximately 8 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 879th yzhs 🇩🇪 858 67 190ms 26 Jun 2023 879th cbrt-x 858 67 182ms 30 Aug 2024 879th pardouin 🇫🇷 858 67 189ms 19 Mar 2025 884th Shanethegamer 🇺🇸 858 90 136ms 15 Apr 2025 884th emgordon154 858 90 122ms 23 days ago 886th sisyphus-ppcg 🇦🇺 858 96 15ms 15 Nov 2022 887th uttumuttu 🇫🇮 857 56 11ms 8 Aug 2022 887th AlephSquirrel 857 56 11ms 15 Feb 2023 887th ejini6969 857 56 35ms 2 Apr 2023 890th gifti258 857 59 74ms 15 Sep 2023 891st Bubbler-4 857 83 118ms 8 Aug 2022 891st elgan65536 857 83 121ms 11 Apr 2024 891st luuumine 🇫🇷 857 83 119ms 11 Nov 2025 894th Yewzir 🇧🇪 857 102 24ms 10 Apr 2024 895th inventshah 856 54 97ms 12 Dec 2022 895th MeWhenI 🇻🇦 856 54 92ms 13 Dec 2022 895th Alessandro-Balconi 🇮🇹 856 54 94ms 15 Jul 2023 898th betaveros 856 57 15ms 8 Aug 2022 898th zacharybarbanell 856 57 15ms 8 Aug 2022 898th andre-lameirinhas 🇵🇹 856 57 16ms 8 Aug 2022 898th Bonjour27891 🇻🇳 856 57 235ms 10 Aug 2022 898th RYNO8 856 57 238ms 16 Aug 2022 898th galloj 🇨🇿 856 57 15ms 18 Aug 2022 898th commandblockguy 🇺🇸 856 57 16ms 27 Aug 2022 898th Eilonlif 🇮🇱 856 57 18ms 9 Sep 2022 898th MaxElf999 856 57 15ms 23 Sep 2022 898th fredrik-bakke 🇳🇴 856 57 16ms 2 Oct 2022 898th aiarzhantsev 856 57 16ms 14 Oct 2022 898th trist224 🇫🇷 856 57 235ms 18 Oct 2022 898th Stockoh 🇫🇷 856 57 240ms 21 Oct 2022 898th andersk 🇺🇸 856 57 16ms 25 Oct 2022 898th fourth-bit 856 57 235ms 6 Dec 2022 898th quimey 856 57 18ms 8 Mar 2023 898th aksyristos 856 57 16ms 11 Mar 2023 898th CedricGebistorf 856 57 16ms 4 May 2023 898th ehulinsky 🇺🇸 856 57 16ms 7 May 2023 898th Griff95 856 57 237ms 21 Sep 2023 898th inverseLorentz 🇦🇺 856 57 17ms 18 Feb 2024 898th sultan 856 57 234ms 3 Mar 2024 898th AminurAlam 856 57 18ms 20 Mar 2024 898th EnTerr 856 57 15ms 1 Sep 2024 898th logvp 856 57 230ms 7 Oct 2024 898th moustave 856 57 16ms 26 Nov 2024 898th nooberitess 856 57 16ms 22 May 2025 898th dirckvdende 856 57 15ms 5 Jul 2025 898th xDragoxboi 856 57 16ms 6 Jul 2025 898th Mikey-Beep 🇬🇧 856 57 16ms 25 Jul 2025 898th shelerr 856 57 234ms 21 Aug 2025 898th CommandLeo 🇮🇹 856 57 16ms 12 Nov 2025 930th inventshah 856 58 4ms 15 Jan 2024 931st Lydxn 🇨🇦 856 60 132ms 9 Aug 2022 931st Shanethegamer 🇺🇸 856 60 126ms 9 Aug 2022 931st Steffan153 🇫🇮 856 60 131ms 6 Dec 2022 931st jipsong 🇩🇪 856 60 131ms 6 May 2025 935th Lydxn 🇨🇦 855 53 135ms 6 Aug 2024 935th emgordon154 855 53 135ms 17 Nov 2024 937th GrayJoKing 🇦🇺 855 63 94ms 14 Aug 2022 937th primo-ppcg 🇹🇭 855 63 94ms 4 Sep 2022 937th MeWhenI 🇻🇦 855 63 114ms 21 Feb 2023 940th SirBogman 🇺🇸 853 53 360ms 16 Jan 2024 940th namelessiw 853 53 356ms 5 Mar 2024 940th commandblockguy 🇺🇸 853 53 343ms 1 Sep 2025 940th snoozingnewt 🇨🇦 853 53 381ms 21 Nov 2025 944th KrausRaus 🇺🇸 853 55 9ms 12 Aug 2022 944th josh-h-90 853 55 7ms 9 Sep 2022 946th GrayJoKing 🇦🇺 853 67 40ms 14 Aug 2022 946th stefangimmillaro 853 67 39ms 15 Apr 2023 946th MeWhenI 🇻🇦 853 67 39ms 10 May 2023 949th DialFrost 🇸🇬 852 136 1,668ms 13 Sep 2025 949th Yewzir 🇧🇪 852 136 2,463ms 14 Nov 2025 951st MeWhenI 🇻🇦 851 71 101ms 21 Feb 2023 952nd Ripick 850 67 216ms 6 Jan 2023 953rd KasperKivimaeki 🇫🇮 850 89 89ms 26 Oct 2025 954th DialFrost 🇸🇬 850 189 59ms 13 Aug 2025 955th primo-ppcg 🇹🇭 849 75 336ms 4 Sep 2022 955th m-tkach 🇺🇦 849 75 335ms 2 Jun 2023 955th CaedenHarper 🇨🇦 849 75 488ms 14 days ago 958th edsrzf 🇳🇿 849 90 46ms 19 Jan 2025 958th kg583 🇺🇸 849 90 41ms 13 Feb 2025 960th CLOStrophobic 🇮🇹 849 91 83ms 8 Feb 2025 First Prev 881–960 of 2,461 Next Last