The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Niven Numbers 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 387th Steffan153 🇫🇮 953 52 117ms 20 Nov 2022 387th Shanethegamer 🇺🇸 953 52 115ms 8 Mar 2023 387th sean-niemann 🇺🇸 953 52 111ms 4 Jul 2023 387th Sakisan 🇧🇪 953 52 115ms 16 Jul 2023 387th btnlq 953 52 113ms 14 Oct 2023 387th Yewzir 🇧🇪 953 52 118ms 20 Nov 2023 387th DialFrost 🇸🇬 953 52 116ms 4 Aug 2024 387th pardouin 🇫🇷 953 52 116ms 21 Aug 2024 387th fuzzylojik-golf 🇺🇸 953 52 115ms 27 Aug 2025 387th albanian-laundromat 953 52 116ms 4 Oct 2025 387th snoozingnewt 🇨🇦 953 52 120ms 16 days ago 387th edsrzf 🇳🇿 953 52 164ms 6 hours ago 413th billings7 🇬🇧 953 60 322ms 21 Nov 2021 413th JayXon 🇺🇸 953 60 324ms 21 Nov 2021 413th Lydxn 🇨🇦 953 60 321ms 21 Nov 2021 413th nwellnhof 🇩🇪 953 60 318ms 21 Nov 2021 413th ovs-code 🇩🇪 953 60 313ms 21 Nov 2021 413th primo-ppcg 🇹🇭 953 60 320ms 21 Nov 2021 413th prplz 🇦🇺 953 60 316ms 21 Nov 2021 413th ScottHamper 953 60 320ms 21 Nov 2021 413th sisyphus-ppcg 🇦🇺 953 60 317ms 21 Nov 2021 413th ssiquoya 🇷🇺 953 60 324ms 21 Nov 2021 413th GrayJoKing 🇦🇺 953 60 319ms 14 Mar 2022 413th annaproxy 953 60 324ms 15 Mar 2022 413th ericlangedijk 🇸🇮 953 60 321ms 15 Mar 2022 413th lynn 953 60 319ms 3 Jun 2022 413th stefangimmillaro 953 60 314ms 30 Sep 2022 413th MeWhenI 🇻🇦 953 60 322ms 10 Oct 2022 413th Steffan153 🇫🇮 953 60 349ms 17 Nov 2022 413th clockworknazo 953 60 320ms 26 Nov 2022 413th DialFrost 🇸🇬 953 60 360ms 14 Jan 2023 413th sean-niemann 🇺🇸 953 60 360ms 17 Jan 2023 413th tomtheisen 🇺🇸 953 60 351ms 17 Jan 2023 413th btnlq 953 60 322ms 28 Feb 2023 413th Shanethegamer 🇺🇸 953 60 313ms 8 Mar 2023 413th AdrienHache 🇫🇷 953 60 324ms 31 May 2023 413th m-tkach 🇺🇦 953 60 319ms 2 Jun 2023 413th namelessiw 953 60 361ms 29 Jul 2023 413th Yewzir 🇧🇪 953 60 334ms 23 Sep 2023 413th Betuaredead 953 60 318ms 11 Nov 2023 413th pardouin 🇫🇷 953 60 340ms 21 Aug 2024 413th voytxt 🇨🇿 953 60 369ms 12 Jan 2025 413th b-illy 🇬🇧 953 60 318ms 21 Jan 2025 413th fuzzylojik-golf 🇺🇸 953 60 373ms 15 May 2025 413th edsrzf 🇳🇿 953 60 322ms 26 Jul 2025 413th albanian-laundromat 953 60 379ms 24 Sep 2025 413th CaedenHarper 🇨🇦 953 60 354ms 17 Oct 2025 413th snoozingnewt 🇨🇦 953 60 383ms 17 days ago 449th ovs-code 🇩🇪 951 43 365ms 15 Jan 2024 449th sean-niemann 🇺🇸 951 43 352ms 15 Jan 2024 449th DialFrost 🇸🇬 951 43 382ms 15 Jan 2024 449th GrayJoKing 🇦🇺 951 43 392ms 15 Jan 2024 449th Lydxn 🇨🇦 951 43 366ms 15 Jan 2024 449th prplz 🇦🇺 951 43 331ms 15 Jan 2024 449th Steffan153 🇫🇮 951 43 333ms 16 Jan 2024 449th AlephSquirrel 951 43 341ms 16 Jan 2024 449th sisyphus-ppcg 🇦🇺 951 43 360ms 16 Jan 2024 449th JayXon 🇺🇸 951 43 368ms 17 Jan 2024 449th neel11235813 951 43 334ms 17 Jan 2024 449th m-tkach 🇺🇦 951 43 369ms 20 Jan 2024 449th orthoplex 🇨🇽 951 43 344ms 24 Jan 2024 449th xsot 🇸🇬 951 43 394ms 25 Jan 2024 449th lynn 951 43 368ms 17 Feb 2024 449th Shanethegamer 🇺🇸 951 43 358ms 24 Mar 2024 449th MeWhenI 🇻🇦 951 43 402ms 24 May 2024 449th Yewzir 🇧🇪 951 43 357ms 4 Jun 2024 449th pardouin 🇫🇷 951 43 374ms 21 Jun 2024 449th CaedenHarper 🇨🇦 951 43 333ms 6 Sep 2024 449th b-illy 🇬🇧 951 43 369ms 7 Sep 2024 449th rucin93 🇵🇱 951 43 400ms 26 Sep 2024 449th emgordon154 951 43 361ms 10 Oct 2024 449th fuzzylojik-golf 🇺🇸 951 43 365ms 2 Jul 2025 449th kg583 🇺🇸 951 43 379ms 26 Jul 2025 449th GolfingSuccess 🇬🇷 951 43 357ms 10 Aug 2025 449th Babafaba 951 43 353ms 24 days ago 476th JayXon 🇺🇸 950 64 328ms 7 days ago 476th Lydxn 🇨🇦 950 64 330ms 7 days ago 478th DialFrost 🇸🇬 948 38 1ms 18 Nov 2025 478th Yewzir 🇧🇪 948 38 1ms 18 Nov 2025 478th rucin93 🇵🇱 948 38 1ms 18 Nov 2025 First Prev 401–480 of 4,138 Next Last