The Calendar hole will go live in approximately 13 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 13 days ago 412th billings7 🇬🇧 952 60 322ms 21 Nov 2021 412th JayXon 🇺🇸 952 60 324ms 21 Nov 2021 412th Lydxn 🇨🇦 952 60 321ms 21 Nov 2021 412th nwellnhof 🇩🇪 952 60 318ms 21 Nov 2021 412th ovs-code 🇩🇪 952 60 313ms 21 Nov 2021 412th primo-ppcg 🇹🇭 952 60 320ms 21 Nov 2021 412th prplz 🇦🇺 952 60 316ms 21 Nov 2021 412th ScottHamper 952 60 320ms 21 Nov 2021 412th sisyphus-ppcg 🇦🇺 952 60 317ms 21 Nov 2021 412th ssiquoya 🇷🇺 952 60 324ms 21 Nov 2021 412th GrayJoKing 🇦🇺 952 60 319ms 14 Mar 2022 412th annaproxy 952 60 324ms 15 Mar 2022 412th ericlangedijk 🇸🇮 952 60 321ms 15 Mar 2022 412th lynn 952 60 319ms 3 Jun 2022 412th stefangimmillaro 952 60 314ms 30 Sep 2022 412th MeWhenI 🇻🇦 952 60 322ms 10 Oct 2022 412th Steffan153 🇫🇮 952 60 349ms 17 Nov 2022 412th clockworknazo 952 60 320ms 26 Nov 2022 412th DialFrost 🇸🇬 952 60 360ms 14 Jan 2023 412th sean-niemann 🇺🇸 952 60 360ms 17 Jan 2023 412th tomtheisen 🇺🇸 952 60 351ms 17 Jan 2023 412th btnlq 952 60 322ms 28 Feb 2023 412th Shanethegamer 🇺🇸 952 60 313ms 8 Mar 2023 412th AdrienHache 🇫🇷 952 60 324ms 31 May 2023 412th m-tkach 🇺🇦 952 60 319ms 2 Jun 2023 412th namelessiw 952 60 361ms 29 Jul 2023 412th Yewzir 🇧🇪 952 60 334ms 23 Sep 2023 412th Betuaredead 952 60 318ms 11 Nov 2023 412th pardouin 🇫🇷 952 60 340ms 21 Aug 2024 412th voytxt 🇨🇿 952 60 369ms 12 Jan 2025 412th b-illy 🇬🇧 952 60 318ms 21 Jan 2025 412th fuzzylojik-golf 🇺🇸 952 60 373ms 15 May 2025 412th edsrzf 🇳🇿 952 60 322ms 26 Jul 2025 412th albanian-laundromat 952 60 379ms 24 Sep 2025 412th CaedenHarper 🇨🇦 952 60 354ms 17 Oct 2025 412th snoozingnewt 🇨🇦 952 60 383ms 14 days ago 448th ovs-code 🇩🇪 951 43 365ms 15 Jan 2024 448th sean-niemann 🇺🇸 951 43 352ms 15 Jan 2024 448th DialFrost 🇸🇬 951 43 382ms 15 Jan 2024 448th GrayJoKing 🇦🇺 951 43 392ms 15 Jan 2024 448th Lydxn 🇨🇦 951 43 366ms 15 Jan 2024 448th prplz 🇦🇺 951 43 331ms 15 Jan 2024 448th Steffan153 🇫🇮 951 43 333ms 16 Jan 2024 448th AlephSquirrel 951 43 341ms 16 Jan 2024 448th sisyphus-ppcg 🇦🇺 951 43 360ms 16 Jan 2024 448th JayXon 🇺🇸 951 43 368ms 17 Jan 2024 448th neel11235813 951 43 334ms 17 Jan 2024 448th m-tkach 🇺🇦 951 43 369ms 20 Jan 2024 448th orthoplex 🇨🇽 951 43 344ms 24 Jan 2024 448th xsot 🇸🇬 951 43 394ms 25 Jan 2024 448th lynn 951 43 368ms 17 Feb 2024 448th Shanethegamer 🇺🇸 951 43 358ms 24 Mar 2024 448th MeWhenI 🇻🇦 951 43 402ms 24 May 2024 448th Yewzir 🇧🇪 951 43 357ms 4 Jun 2024 448th pardouin 🇫🇷 951 43 374ms 21 Jun 2024 448th CaedenHarper 🇨🇦 951 43 333ms 6 Sep 2024 448th b-illy 🇬🇧 951 43 369ms 7 Sep 2024 448th rucin93 🇵🇱 951 43 400ms 26 Sep 2024 448th emgordon154 951 43 361ms 10 Oct 2024 448th fuzzylojik-golf 🇺🇸 951 43 365ms 2 Jul 2025 448th kg583 🇺🇸 951 43 379ms 26 Jul 2025 448th GolfingSuccess 🇬🇷 951 43 357ms 10 Aug 2025 448th Babafaba 951 43 353ms 21 days ago 475th JayXon 🇺🇸 950 64 328ms 4 days ago 475th Lydxn 🇨🇦 950 64 330ms 4 days ago 477th DialFrost 🇸🇬 948 38 1ms 18 Nov 2025 477th Yewzir 🇧🇪 948 38 1ms 18 Nov 2025 477th rucin93 🇵🇱 948 38 1ms 18 Nov 2025 477th edsrzf 🇳🇿 948 38 1ms 18 Nov 2025 First Prev 401–480 of 4,135 Next Last