The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Niven Numbers (Long) in all languages in bytes. 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 Bytes Time Submitted 615th Yewzir 🇧🇪 906 54 17ms 4 Jun 2024 615th b-illy 🇬🇧 906 54 16ms 8 Aug 2024 615th dokutan 906 54 16ms 28 Sep 2024 615th quarl 906 54 18ms 13 Nov 2024 615th lifthrasiir 🇰🇷 906 54 15ms 13 Nov 2024 615th ryyyn 🇺🇸 906 54 17ms 6 Jan 2025 615th wen1now 906 54 16ms 19 Jan 2025 615th plcc0 906 54 17ms 20 Feb 2025 615th Pyroan 906 54 17ms 3 Mar 2025 615th Languag3 906 54 16ms 6 Mar 2025 615th emgordon154 906 54 19ms 13 Apr 2025 615th andrewjc2000 906 54 18ms 15 Apr 2025 615th keelimeguy 🇺🇸 906 54 17ms 6 May 2025 615th jipsong 🇩🇪 906 54 16ms 20 Jun 2025 615th KasperKivimaeki 🇫🇮 906 54 17ms 30 Jun 2025 615th wuduculfre 906 54 16ms 21 Jul 2025 615th albanian-laundromat 906 54 15ms 18 Aug 2025 615th YAJUE114514 906 54 16ms 24 Aug 2025 615th blaztoma 🇱🇹 906 54 16ms 15 Sep 2025 615th davecame 906 54 16ms 19 Sep 2025 615th Babafaba 906 54 16ms 17 Oct 2025 615th luuumine 🇫🇷 906 54 17ms 20 Oct 2025 615th j-zhang43 906 54 17ms 17 Nov 2025 615th solisolu 906 54 16ms 23 days ago 615th tomh1012 906 54 17ms 15 days ago 615th Lv0Sys 🇵🇱 906 54 17ms 11 days ago 667th GrayJoKing 🇦🇺 906 59 21ms 5 Feb 2025 667th GolfingSuccess 🇬🇷 906 59 25ms 11 Sep 2025 669th Lydxn 🇨🇦 906 75 4ms 15 Jul 2023 669th Steffan153 🇫🇮 906 75 4ms 22 Jul 2023 669th GrayJoKing 🇦🇺 906 75 5ms 26 Jul 2023 669th typeswitch-dev 🇵🇹 906 75 4ms 17 Aug 2023 669th sean-niemann 🇺🇸 906 75 4ms 11 Jun 2025 669th fuzzylojik-golf 🇺🇸 906 75 5ms 18 Sep 2025 675th Lydxn 🇨🇦 905 62 132ms 9 Aug 2022 675th Shanethegamer 🇺🇸 905 62 126ms 9 Aug 2022 675th Steffan153 🇫🇮 905 62 135ms 6 Dec 2022 675th jipsong 🇩🇪 905 62 131ms 6 May 2025 679th Lydxn 🇨🇦 905 79 26ms 13 Jan 2023 679th Steffan153 🇫🇮 905 79 26ms 28 Jul 2024 679th pardouin 🇫🇷 905 79 26ms 21 Oct 2024 679th DialFrost 🇸🇬 905 79 26ms 11 Apr 2025 679th sean-niemann 🇺🇸 905 79 27ms 19 May 2025 684th JayXon 🇺🇸 905 97 24ms 10 Nov 2022 684th Lydxn 🇨🇦 905 97 24ms 11 Nov 2022 684th Steffan153 🇫🇮 905 97 25ms 28 Jul 2024 684th sean-niemann 🇺🇸 905 97 24ms 1 Aug 2024 684th DialFrost 🇸🇬 905 97 29ms 11 Apr 2025 684th fuzzylojik-golf 🇺🇸 905 97 26ms 12 Aug 2025 690th GrayJoKing 🇦🇺 904 65 1,274ms 14 Aug 2022 690th primo-ppcg 🇹🇭 904 65 1,261ms 4 Sep 2022 690th Shanethegamer 🇺🇸 904 65 1,272ms 7 Mar 2023 690th MeWhenI 🇻🇦 904 65 1,259ms 8 Jun 2023 690th lynn 904 65 1,258ms 16 Jul 2023 690th ovs-code 🇩🇪 904 65 3ms 4 Nov 2023 690th Yewzir 🇧🇪 904 65 1,306ms 10 Apr 2024 690th xsot 🇸🇬 904 65 3ms 12 Jun 2024 698th GrayJoKing 🇦🇺 904 85 74ms 14 Aug 2022 698th primo-ppcg 🇹🇭 904 85 62ms 7 Dec 2022 698th inventshah 904 85 67ms 26 Jan 2023 698th m-tkach 🇺🇦 904 85 65ms 2 Jun 2023 698th snyderek 🇺🇸 904 85 70ms 24 Nov 2024 703rd Shanethegamer 🇺🇸 903 64 183ms 13 Aug 2022 704th GrayJoKing 🇦🇺 903 68 17ms 14 Aug 2022 704th Lydxn 🇨🇦 903 68 15ms 15 Aug 2022 704th primo-ppcg 🇹🇭 903 68 16ms 4 Sep 2022 704th IanUtley 903 68 16ms 12 Nov 2022 704th Yewzir 🇧🇪 903 68 16ms 10 Apr 2024 709th kg583 🇺🇸 903 86 81ms 19 Dec 2024 710th sisyphus-ppcg 🇦🇺 902 63 108ms 8 Aug 2022 710th GrayJoKing 🇦🇺 902 63 94ms 14 Aug 2022 710th primo-ppcg 🇹🇭 902 63 94ms 4 Sep 2022 710th MeWhenI 🇻🇦 902 63 114ms 21 Feb 2023 710th Yewzir 🇧🇪 902 63 119ms 10 Apr 2024 715th MeWhenI 🇻🇦 902 69 38ms 21 Feb 2023 716th Steffan153 🇫🇮 900 77 18ms 11 Dec 2023 716th Shanethegamer 🇺🇸 900 77 19ms 11 Dec 2023 716th Lydxn 🇨🇦 900 77 21ms 21 Dec 2023 716th kg583 🇺🇸 900 77 19ms 31 Jul 2025 720th DialFrost 🇸🇬 900 92 17ms 14 Apr 2025 First Prev 641–720 of 2,482 Next Last