The Calendar hole will go live in approximately 7 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 554th Yax42 🇫🇷 915 72 443ms 5 Oct 2025 554th snoozingnewt 🇨🇦 915 72 370ms 14 days ago 563rd Lydxn 🇨🇦 914 63 39ms 11 Nov 2022 563rd marshallward 🇺🇸 914 63 39ms 11 Nov 2022 565th arctouch-cristiannevianna 914 71 371ms 15 Jun 2023 565th leth4 914 71 359ms 5 Jul 2023 565th malworthy 914 71 371ms 25 Oct 2023 565th Mikey-Beep 🇬🇧 914 71 390ms 23 Jul 2025 569th prplz 🇦🇺 913 51 141ms 12 Dec 2022 569th Steffan153 🇫🇮 913 51 148ms 15 Aug 2024 571st edsrzf 🇳🇿 912 76 19ms 18 Jan 2025 571st zacjl 912 76 22ms 19 Jan 2025 573rd KrausRaus 🇺🇸 911 34 108ms 12 Aug 2022 573rd primo-ppcg 🇹🇭 911 34 68ms 22 Jan 2025 575th nwellnhof 🇩🇪 911 40 3,924ms 9 Mar 2023 575th HumanEquivalentUnit 911 40 4,024ms 24 Oct 2023 575th dcgjb 911 40 4,004ms 23 Jan 2024 575th DialFrost 🇸🇬 911 40 3,988ms 10 Oct 2024 579th AlephSquirrel 911 54 13ms 23 Apr 2023 579th ovs-code 🇩🇪 911 54 12ms 10 Dec 2023 581st sisyphus-ppcg 🇦🇺 911 62 83ms 8 Aug 2022 581st GrayJoKing 🇦🇺 911 62 81ms 14 Aug 2022 581st primo-ppcg 🇹🇭 911 62 84ms 4 Sep 2022 581st steffan-polygolf 911 62 80ms 19 Feb 2023 581st MeWhenI 🇻🇦 911 62 81ms 21 Feb 2023 581st stefangimmillaro 911 62 82ms 15 Apr 2023 581st Yewzir 🇧🇪 911 62 80ms 10 Apr 2024 588th MeWhenI 🇻🇦 911 81 452ms 7 Nov 2025 589th inventshah 910 51 357ms 16 Jan 2024 589th GolfingSuccess 🇬🇷 910 51 358ms 20 Jan 2024 589th ridingqwerty 🇺🇸 910 51 358ms 22 Jan 2024 589th neel11235813 910 51 350ms 10 Mar 2024 589th duckyluuk 🇳🇱 910 51 345ms 27 Mar 2024 589th b-illy 🇬🇧 910 51 359ms 9 Sep 2024 589th emgordon154 910 51 360ms 13 Apr 2025 589th Babafaba 910 51 394ms 17 Oct 2025 597th eranws 910 53 34ms 1 Nov 2022 598th Lydxn 🇨🇦 910 55 4ms 15 Jan 2024 598th Steffan153 🇫🇮 910 55 3ms 28 Jul 2024 598th Yewzir 🇧🇪 910 55 5ms 18 Nov 2025 598th GrayJoKing 🇦🇺 910 55 3ms 19 Nov 2025 602nd chunes3 🇺🇸 910 56 76ms 15 Sep 2023 602nd Steffan153 🇫🇮 910 56 74ms 16 Sep 2023 602nd 4hg 🇺🇸 910 56 75ms 17 Sep 2023 602nd Lydxn 🇨🇦 910 56 74ms 28 Sep 2023 602nd Yewzir 🇧🇪 910 56 74ms 7 Mar 2024 607th sisyphus-ppcg 🇦🇺 909 63 122ms 8 Aug 2022 607th GrayJoKing 🇦🇺 909 63 122ms 14 Aug 2022 607th primo-ppcg 🇹🇭 909 63 119ms 4 Sep 2022 607th steffan-polygolf 909 63 121ms 19 Feb 2023 607th MeWhenI 🇻🇦 909 63 121ms 21 Feb 2023 607th Yewzir 🇧🇪 909 63 125ms 10 Apr 2024 613th sisyphus-ppcg 🇦🇺 909 103 268ms 8 Aug 2022 613th GrayJoKing 🇦🇺 909 103 262ms 14 Aug 2022 615th Lv0Sys 🇵🇱 908 43 364ms 17 days ago 615th snoozingnewt 🇨🇦 908 43 390ms 14 days ago 617th Sp3000 🇦🇺 906 54 16ms 8 Aug 2022 617th GolfingSuccess 🇬🇷 906 54 16ms 8 Aug 2022 617th 051 🇸🇬 906 54 16ms 8 Aug 2022 617th CubeyTheCube 906 54 16ms 8 Aug 2022 617th ZakkkkAttackkkk 🇵🇭 906 54 18ms 8 Aug 2022 617th jared-hughes 906 54 16ms 9 Aug 2022 617th annaproxy 906 54 16ms 9 Aug 2022 617th BlankSpruce 906 54 16ms 17 Aug 2022 617th prplz 🇦🇺 906 54 16ms 19 Aug 2022 617th bob-th 906 54 16ms 22 Aug 2022 617th TFeld00 🇩🇰 906 54 16ms 3 Oct 2022 617th bricknellj 906 54 16ms 31 Oct 2022 617th thehylian 906 54 16ms 27 Dec 2022 617th janbehrens 🇩🇪 906 54 16ms 11 Jul 2023 617th AlexanderFair 906 54 16ms 12 Jul 2023 617th fkantelberg 906 54 16ms 18 Jul 2023 617th FlorianCassayre 🇫🇷 906 54 16ms 28 Sep 2023 617th ndren 906 54 20ms 9 Oct 2023 617th neel11235813 906 54 16ms 20 Oct 2023 617th ridingqwerty 🇺🇸 906 54 16ms 22 Dec 2023 617th bzijlema 🇳🇱 906 54 16ms 12 Jan 2024 617th jhu04 906 54 19ms 18 Jan 2024 617th duckyluuk 🇳🇱 906 54 16ms 24 Jan 2024 617th 5cw 🇺🇸 906 54 18ms 5 Mar 2024 First Prev 561–640 of 2,480 Next Last