The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Niven Numbers (Long) in Python 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 226th 1231234md5 🇨🇳 833 60 18ms 10 May 2024 226th cyxv 833 60 15ms 26 Jul 2024 226th NanduBC 833 60 16ms 7 Sep 2024 226th Loag 833 60 16ms 22 Sep 2024 226th gallium-gonzollium 833 60 15ms 2 Nov 2024 226th ejini6969 833 60 1,772ms 14 Jun 2025 226th Flekay 🇩🇪 833 60 16ms 10 Jul 2025 226th RaBa21 🇭🇺 833 60 17ms 11 Jul 2025 226th jacekwladzinski 833 60 16ms 3 Oct 2025 226th madeforlosers 833 60 14ms 11 Nov 2025 251st michelebastione 🇮🇹 820 61 17ms 15 Aug 2022 251st glesnick 820 61 15ms 15 Aug 2022 251st MichaelMBradley 🇨🇦 820 61 15ms 18 Aug 2022 251st argusdusty 🇺🇸 820 61 15ms 21 Aug 2022 251st PhysicDev 🇫🇷 820 61 16ms 5 Sep 2022 251st 0-4849 820 61 302ms 30 Oct 2022 251st taesungh 820 61 15ms 15 Oct 2023 251st adamnielson42 🇺🇸 820 61 16ms 15 Nov 2023 251st Jacob385 820 61 19ms 18 Apr 2024 251st kejcao 🇨🇦 820 61 22ms 16 May 2024 251st dal548 820 61 22ms 12 Jun 2024 251st hellwue 820 61 269ms 25 Jun 2024 263rd jaxmattfair 🇺🇸 806 62 15ms 9 Aug 2022 263rd P-Quentin 🇫🇷 806 62 267ms 10 Aug 2022 263rd kenballus 806 62 16ms 17 Aug 2022 263rd shibacho 🇯🇵 806 62 15ms 19 Aug 2022 263rd LordJimX 806 62 16ms 26 Aug 2022 263rd dgambit 806 62 15ms 30 Aug 2022 263rd heyuncle 806 62 15ms 4 Sep 2022 263rd sleepingtable 806 62 16ms 6 Sep 2022 263rd LukasFolwarczny 🇨🇿 806 62 15ms 22 Sep 2022 263rd kevdah 806 62 16ms 4 Oct 2022 263rd Bodo171 806 62 15ms 25 Nov 2022 263rd PYRiTEmonark 806 62 16ms 29 Nov 2022 263rd badboj40 806 62 15ms 26 Dec 2022 263rd MiranDaniel 🇨🇿 806 62 15ms 2 Sep 2023 263rd ssbhatt4321 806 62 15ms 14 Oct 2023 263rd midnattssol 🇸🇪 806 62 15ms 19 Oct 2023 263rd eiburns 806 62 16ms 27 Oct 2023 263rd adoxography 806 62 15ms 19 Nov 2023 263rd Pale-Vessel 806 62 15ms 18 Dec 2023 263rd mstang107 806 62 17ms 20 Dec 2023 263rd HumanoidCPU 806 62 21ms 26 Apr 2024 263rd CutSandstone 806 62 15ms 8 Jul 2024 263rd alexeldridge 806 62 15ms 8 Aug 2024 263rd CyberTapir 806 62 16ms 28 Aug 2024 263rd Andrey135296 806 62 16ms 25 Nov 2024 263rd croc54 806 62 17ms 13 Jan 2025 263rd robin-scragg 806 62 17ms 22 May 2025 263rd iczelia 🇩🇪 806 62 16ms 19 Oct 2025 291st descentcare 794 63 19ms 8 Aug 2022 291st dankleeman 794 63 15ms 8 Aug 2022 291st Lemonz-13223 794 63 16ms 23 Aug 2022 291st MarioSchwalbe 794 63 15ms 26 Aug 2022 291st MichalMarsalek 🇨🇿 794 63 17ms 29 Aug 2022 291st andre-de-lorde 794 63 18ms 6 Sep 2022 291st za3k 794 63 15ms 9 Oct 2022 291st PATTRIM 794 63 18ms 5 Jan 2023 291st Igyeom 🇰🇷 794 63 15ms 9 Jun 2023 291st alexjurkiewicz 🇦🇺 794 63 18ms 8 Nov 2023 291st jameswmccarty 794 63 16ms 15 Jun 2024 291st Mathrew2012 794 63 16ms 15 Aug 2024 291st FernSchoenberg 794 63 16ms 9 Oct 2024 291st ihatethefrench 794 63 18ms 5 Jan 2025 291st EnisEfe0 794 63 21ms 18 May 2025 306th gdupeux 781 64 15ms 26 Aug 2022 306th estomagordo 🇳🇱 781 64 15ms 26 Oct 2022 306th gabrielsqw 781 64 15ms 17 Apr 2023 306th cingulataluke 781 64 16ms 29 Aug 2023 306th DavidHospital 781 64 17ms 22 Sep 2023 306th RedzGoose 🇦🇺 781 64 20ms 20 Oct 2024 306th Andrey2001 781 64 20ms 10 days ago 313th bwenstar 769 65 18ms 11 Aug 2022 313th Glinte 769 65 16ms 13 Dec 2023 313th markusgraube 769 65 16ms 9 Mar 2024 313th wilhelmines 769 65 15ms 17 Jun 2024 313th Schreipfelerer 769 65 16ms 11 Sep 2024 313th TheZwierzLF 🇵🇱 769 65 17ms 19 May 2025 319th hymanimy 758 66 15ms 18 Aug 2022 319th Sloimayyy 758 66 16ms 21 Aug 2022 First Prev 241–320 of 470 Next Last