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 chars. 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 Chars Time Submitted 548th KatieLG 🇬🇧 903 54 17ms 11 Dec 2022 548th thehylian 903 54 16ms 27 Dec 2022 548th neel11235813 903 54 16ms 11 Jan 2023 548th Alex-x90 🇺🇸 903 54 16ms 20 Jan 2023 548th anter69 🇭🇺 903 54 16ms 31 Jan 2023 548th janbehrens 🇩🇪 903 54 16ms 11 Jul 2023 548th AlexanderFair 903 54 16ms 12 Jul 2023 548th fkantelberg 903 54 16ms 18 Jul 2023 548th m42km 903 54 1,657ms 19 Oct 2023 548th ridingqwerty 🇺🇸 903 54 16ms 22 Dec 2023 548th bzijlema 🇳🇱 903 54 16ms 12 Jan 2024 548th jhu04 903 54 19ms 18 Jan 2024 548th 5cw 🇺🇸 903 54 18ms 5 Mar 2024 548th Lewenhaupt 903 54 17ms 22 Mar 2024 548th Grrisly 903 54 15ms 25 Mar 2024 548th SB-945 903 54 18ms 31 Mar 2024 548th jatloe 903 54 18ms 24 Aug 2024 548th quarl 903 54 18ms 13 Nov 2024 548th wh3n3v3r 🇨🇿 903 54 16ms 13 Nov 2024 548th ryyyn 🇺🇸 903 54 17ms 6 Jan 2025 548th wen1now 903 54 16ms 19 Jan 2025 548th plcc0 903 54 17ms 20 Feb 2025 548th Pyroan 903 54 17ms 3 Mar 2025 548th Languag3 903 54 16ms 6 Mar 2025 548th andrewjc2000 903 54 18ms 15 Apr 2025 548th jipsong 🇩🇪 903 54 16ms 20 Jun 2025 548th KasperKivimaeki 🇫🇮 903 54 17ms 30 Jun 2025 548th wuduculfre 903 54 16ms 21 Jul 2025 548th YAJUE114514 903 54 16ms 24 Aug 2025 548th blaztoma 🇱🇹 903 54 16ms 15 Sep 2025 548th davecame 903 54 16ms 19 Sep 2025 548th j-zhang43 903 54 17ms 17 Nov 2025 548th solisolu 903 54 16ms 22 days ago 548th tomh1012 903 54 17ms 15 days ago 548th Lv0Sys 🇵🇱 903 54 17ms 11 days ago 596th Lydxn 🇨🇦 903 55 4ms 15 Jan 2024 596th Steffan153 🇫🇮 903 55 3ms 28 Jul 2024 596th fuzzylojik-golf 🇺🇸 903 55 3ms 13 Jul 2025 596th Yewzir 🇧🇪 903 55 5ms 18 Nov 2025 596th GrayJoKing 🇦🇺 903 55 3ms 19 Nov 2025 601st chunes3 🇺🇸 903 56 77ms 15 Sep 2023 601st Steffan153 🇫🇮 903 56 74ms 16 Sep 2023 601st 4hg 🇺🇸 903 56 75ms 17 Sep 2023 601st Lydxn 🇨🇦 903 56 74ms 28 Sep 2023 601st Yewzir 🇧🇪 903 56 74ms 7 Mar 2024 606th KrausRaus 🇺🇸 901 34 108ms 12 Aug 2022 606th primo-ppcg 🇹🇭 901 34 68ms 22 Jan 2025 608th JayXon 🇺🇸 901 97 24ms 10 Nov 2022 608th Lydxn 🇨🇦 901 97 24ms 11 Nov 2022 608th Steffan153 🇫🇮 901 97 25ms 28 Jul 2024 608th sean-niemann 🇺🇸 901 97 24ms 1 Aug 2024 608th DialFrost 🇸🇬 901 97 29ms 11 Apr 2025 608th fuzzylojik-golf 🇺🇸 901 97 26ms 12 Aug 2025 614th Lv0Sys 🇵🇱 900 43 364ms 11 days ago 615th xsot 🇸🇬 900 65 3ms 12 Jun 2024 616th Lydxn 🇨🇦 900 75 4ms 15 Jul 2023 616th Steffan153 🇫🇮 900 75 4ms 22 Jul 2023 616th GrayJoKing 🇦🇺 900 75 5ms 26 Jul 2023 616th typeswitch-dev 🇵🇹 900 75 4ms 17 Aug 2023 616th sean-niemann 🇺🇸 900 75 4ms 11 Jun 2025 616th fuzzylojik-golf 🇺🇸 900 75 5ms 18 Sep 2025 622nd Lydxn 🇨🇦 900 79 26ms 13 Jan 2023 622nd Steffan153 🇫🇮 900 79 26ms 28 Jul 2024 622nd pardouin 🇫🇷 900 79 26ms 21 Oct 2024 622nd DialFrost 🇸🇬 900 79 26ms 11 Apr 2025 622nd sean-niemann 🇺🇸 900 79 27ms 19 May 2025 627th kg583 🇺🇸 899 86 81ms 19 Dec 2024 628th GrayJoKing 🇦🇺 898 59 21ms 5 Feb 2025 628th GolfingSuccess 🇬🇷 898 59 25ms 11 Sep 2025 630th Shanethegamer 🇺🇸 898 64 183ms 13 Aug 2022 631st GrayJoKing 🇦🇺 898 65 1,274ms 14 Aug 2022 631st primo-ppcg 🇹🇭 898 65 1,261ms 4 Sep 2022 631st Shanethegamer 🇺🇸 898 65 1,272ms 7 Mar 2023 631st MeWhenI 🇻🇦 898 65 1,259ms 8 Jun 2023 631st lynn 898 65 1,258ms 16 Jul 2023 631st Yewzir 🇧🇪 898 65 1,306ms 10 Apr 2024 637th arctouch-cristiannevianna 897 71 371ms 15 Jun 2023 637th leth4 897 71 359ms 5 Jul 2023 637th malworthy 897 71 371ms 25 Oct 2023 637th Mikey-Beep 🇬🇧 897 71 402ms 23 Jul 2025 First Prev 561–640 of 2,465 Next Last