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 477th JayXon 🇺🇸 948 38 1ms 19 Nov 2025 477th sean-niemann 🇺🇸 948 38 1ms 19 Nov 2025 477th GrayJoKing 🇦🇺 948 38 1ms 19 Nov 2025 477th ovs-code 🇩🇪 948 38 1ms 19 Nov 2025 477th Shanethegamer 🇺🇸 948 38 2ms 19 Nov 2025 477th pardouin 🇫🇷 948 38 1ms 19 Nov 2025 477th snoozingnewt 🇨🇦 948 38 1ms 14 days ago 488th Lydxn 🇨🇦 947 37 72ms 12 Dec 2022 488th ovs-code 🇩🇪 947 37 67ms 29 Jan 2023 488th DialFrost 🇸🇬 947 37 70ms 27 May 2024 488th sean-niemann 🇺🇸 947 37 72ms 12 Jul 2024 488th Steffan153 🇫🇮 947 37 71ms 13 Jul 2024 488th pardouin 🇫🇷 947 37 73ms 22 Aug 2024 494th prplz 🇦🇺 947 61 121ms 13 Jan 2022 494th GrayJoKing 🇦🇺 947 61 120ms 13 Jan 2022 494th JayXon 🇺🇸 947 61 120ms 13 Jan 2022 494th Lydxn 🇨🇦 947 61 120ms 13 Jan 2022 494th primo-ppcg 🇹🇭 947 61 126ms 14 Jan 2022 494th sisyphus-ppcg 🇦🇺 947 61 124ms 17 Jan 2022 494th lynn 947 61 118ms 10 Mar 2022 494th Bubbler-4 947 61 120ms 8 Aug 2022 494th MeWhenI 🇻🇦 947 61 118ms 10 Oct 2022 494th clockworknazo 947 61 120ms 12 Oct 2022 494th andersk 🇺🇸 947 61 123ms 22 Oct 2022 494th Steffan153 🇫🇮 947 61 120ms 17 Nov 2022 494th stefangimmillaro 947 61 122ms 25 Nov 2022 494th sean-niemann 🇺🇸 947 61 122ms 17 Jan 2023 494th DialFrost 🇸🇬 947 61 123ms 18 Jan 2023 494th rucin93 🇵🇱 947 61 123ms 23 Jan 2023 494th Shanethegamer 🇺🇸 947 61 121ms 8 Mar 2023 494th ovs-code 🇩🇪 947 61 119ms 20 Jun 2023 494th Yewzir 🇧🇪 947 61 118ms 23 Sep 2023 494th Betuaredead 947 61 120ms 11 Nov 2023 494th elgan65536 947 61 120ms 5 Mar 2024 494th pardouin 🇫🇷 947 61 122ms 22 Aug 2024 494th nullie 947 61 120ms 18 Dec 2024 494th acotis 947 61 120ms 26 Jan 2025 494th emgordon154 947 61 132ms 18 Feb 2025 494th fuzzylojik-golf 🇺🇸 947 61 172ms 17 Jun 2025 494th edsrzf 🇳🇿 947 61 120ms 26 Jul 2025 494th qpwoeirut 947 61 122ms 16 Aug 2025 494th kumavale 947 61 121ms 17 Aug 2025 494th albanian-laundromat 947 61 119ms 24 Sep 2025 494th snoozingnewt 🇨🇦 947 61 116ms 14 days ago 525th GrayJoKing 🇦🇺 946 35 39ms 8 Sep 2021 525th ovs-code 🇩🇪 946 35 43ms 21 Jun 2022 527th michael-pruglo 🇺🇦 946 50 1ms 13 Jul 2022 527th qwertyuiop3 🇷🇺 946 50 2ms 14 May 2025 529th btnlq 945 29 230ms 21 Feb 2021 529th nwellnhof 🇩🇪 945 29 246ms 25 Oct 2021 529th primo-ppcg 🇹🇭 945 29 260ms 10 Mar 2022 529th GrayJoKing 🇦🇺 945 29 222ms 10 Mar 2022 529th SirBogman 🇺🇸 945 29 250ms 23 Jun 2022 529th MeWhenI 🇻🇦 945 29 217ms 28 Jan 2023 529th stefangimmillaro 945 29 249ms 29 Oct 2023 529th Yewzir 🇧🇪 945 29 233ms 19 Nov 2023 529th dcgjb 945 29 258ms 24 Jan 2024 529th DialFrost 🇸🇬 945 29 247ms 6 Jun 2024 529th bitsandbeyond 🇳🇱 945 29 216ms 20 Oct 2025 540th primo-ppcg 🇹🇭 945 44 117ms 25 Apr 2020 540th prplz 🇦🇺 945 44 118ms 16 May 2020 540th Lydxn 🇨🇦 945 44 117ms 12 Jan 2021 540th JayXon 🇺🇸 945 44 118ms 16 Feb 2021 540th sisyphus-ppcg 🇦🇺 945 44 120ms 30 May 2021 540th ovs-code 🇩🇪 945 44 118ms 19 Nov 2021 540th GrayJoKing 🇦🇺 945 44 118ms 15 Dec 2021 540th MichalMarsalek 🇨🇿 945 44 120ms 16 Feb 2022 540th lynn 945 44 119ms 3 Jun 2022 540th MeWhenI 🇻🇦 945 44 117ms 10 Oct 2022 540th clockworknazo 945 44 117ms 26 Nov 2022 540th Steffan153 🇫🇮 945 44 116ms 30 Nov 2022 540th sean-niemann 🇺🇸 945 44 120ms 17 Jan 2023 540th DialFrost 🇸🇬 945 44 117ms 18 Jan 2023 540th steffan-polygolf 945 44 117ms 19 Feb 2023 540th Shanethegamer 🇺🇸 945 44 117ms 8 Mar 2023 540th stefangimmillaro 945 44 119ms 11 Jun 2023 540th Yewzir 🇧🇪 945 44 118ms 23 Sep 2023 540th Betuaredead 945 44 119ms 13 Nov 2023 540th pardouin 🇫🇷 945 44 126ms 21 Sep 2024 540th fuzzylojik-golf 🇺🇸 945 44 124ms 7 Aug 2025 First Prev 481–560 of 4,135 Next Last