The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in Python 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 76th jipsong 🇩🇪 897 58 23ms 20 Jun 2025 82nd AlexanderFair 881 59 23ms 18 Jul 2023 82nd Grrisly 881 59 16ms 30 Mar 2024 82nd dokutan 881 59 17ms 9 Jun 2024 82nd albanian-laundromat 881 59 16ms 21 Aug 2025 86th janbehrens 🇩🇪 867 60 24ms 20 Nov 2022 86th Omega65536 🇩🇪 867 60 17ms 24 Nov 2022 86th Just4FunCoder 867 60 16ms 24 Mar 2023 86th Fracture17 867 60 19ms 13 Apr 2023 86th GolfingSuccess 🇬🇷 867 60 18ms 17 Oct 2023 86th steffan-polygolf 867 60 18ms 14 Feb 2024 86th bzijlema 🇳🇱 867 60 29ms 22 Jul 2024 86th bizy-coder 867 60 18ms 15 Aug 2024 86th keelimeguy 🇺🇸 867 60 19ms 15 May 2025 95th Eilonlif 🇮🇱 852 61 17ms 9 Dec 2022 95th SirFireball3521 852 61 16ms 9 Mar 2023 95th minhtrancccp 852 61 19ms 11 Jan 2024 95th stertooy 🇧🇪 852 61 17ms 14 Jun 2024 99th KatieLG 🇬🇧 839 62 16ms 26 Nov 2022 99th suwat513 839 62 17ms 6 Dec 2022 99th StefanHabel 🇨🇦 839 62 19ms 19 Dec 2022 99th Ripick 839 62 23ms 1 Feb 2023 99th quimey 839 62 17ms 8 Mar 2023 99th firegene 🇮🇪 839 62 16ms 2 Apr 2023 99th yzhs 🇩🇪 839 62 23ms 23 Jun 2023 99th Andriamanitra 🇫🇮 839 62 17ms 17 Jul 2023 99th Re-Adventures 🇮🇳 839 62 18ms 20 Jul 2023 99th fkantelberg 839 62 17ms 12 Aug 2023 99th Mikey-Beep 🇬🇧 839 62 16ms 23 Aug 2023 99th htareque 839 62 16ms 13 Oct 2023 99th neel11235813 839 62 17ms 27 Mar 2024 99th SB-945 839 62 18ms 31 Mar 2024 99th BREMAUCY 🇫🇷 839 62 17ms 14 May 2024 99th ahmetdemirag 🇨🇾 839 62 18ms 25 Jun 2024 99th cros107 🇦🇺 839 62 22ms 27 Jun 2024 99th codingisgreatbutiamnot 839 62 16ms 6 Aug 2024 99th tjwrenn 839 62 17ms 6 Dec 2024 118th trist224 🇫🇷 825 63 16ms 14 Dec 2022 118th retrohun 825 63 19ms 28 Dec 2022 118th msbranicky 825 63 22ms 23 Jul 2023 118th PeterTillema 🇳🇱 825 63 17ms 18 Mar 2024 118th hellwue 825 63 302ms 25 Jun 2024 118th InigoK 🇺🇸 825 63 24ms 19 Sep 2025 124th QuincyNash 🇺🇸 813 64 17ms 20 Nov 2022 124th nstearns96 🇬🇧 813 64 245ms 23 Nov 2022 124th Bodo171 813 64 16ms 27 Nov 2022 124th TaserTheFox 🇺🇸 813 64 16ms 14 Jan 2023 124th jmerle 🇳🇱 813 64 16ms 16 Feb 2023 124th vishwathg 813 64 16ms 7 Apr 2023 124th dteague3989 813 64 16ms 8 Aug 2023 124th NickTheEASDude 🇺🇸 813 64 23ms 1 May 2024 124th aalec 813 64 16ms 3 May 2024 124th mishak-sys 813 64 16ms 25 Feb 2025 124th YAJUE114514 813 64 15ms 1 Aug 2025 124th Deedogg 813 64 16ms 30 Oct 2025 136th fourth-bit 800 65 19ms 11 Jul 2023 136th Bmrl7 800 65 18ms 24 Feb 2024 136th shelerr 800 65 26ms 22 Aug 2025 139th aksyristos 788 66 19ms 17 Jan 2023 139th OllieBoyne 🇬🇧 788 66 19ms 28 Feb 2023 139th randolchance 788 66 19ms 12 Mar 2023 139th CheeseCake628 🇳🇴 788 66 18ms 19 Mar 2023 139th adamnielson42 🇺🇸 788 66 17ms 31 Mar 2023 139th ehulinsky 🇺🇸 788 66 18ms 8 May 2023 139th TheoKeller1 788 66 17ms 11 Jun 2023 139th dranjohn 788 66 16ms 11 Sep 2023 139th inverseLorentz 🇦🇺 788 66 19ms 23 Oct 2023 139th RedzGoose 🇦🇺 788 66 19ms 23 Oct 2024 139th yokasuretsu 788 66 17ms 7 Jan 2025 139th croc54 788 66 17ms 13 Jan 2025 139th ejini6969 788 66 17ms 14 Jun 2025 139th osNiko 🇧🇷 788 66 17ms 20 Aug 2025 139th Troon 788 66 24ms 22 Aug 2025 154th bob-th 776 67 17ms 23 Dec 2022 154th n0Oo0Oo0b 776 67 18ms 29 Dec 2022 154th betaveros 776 67 32ms 31 Dec 2022 154th vgamula 🇺🇦 776 67 17ms 15 Mar 2023 154th VictorStenvers 🇳🇱 776 67 18ms 26 Mar 2025 159th MaxElf999 765 68 17ms 21 Nov 2022 159th guilhem-roy 🇫🇷 765 68 16ms 21 Nov 2022 First Prev 81–160 of 293 Next Last