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 159th knutae 🇳🇴 765 68 18ms 30 Nov 2022 159th 4ndyJ 🇬🇧 765 68 16ms 10 Jan 2023 159th andre-lameirinhas 🇵🇹 765 68 17ms 18 May 2023 159th WillConker 765 68 20ms 16 Jul 2023 159th AforAmpere 765 68 16ms 20 Sep 2023 159th Simpos 765 68 30ms 24 Oct 2023 159th mikehanus 765 68 19ms 22 Nov 2023 159th chartung17 765 68 17ms 31 Dec 2023 159th mathisfun271 765 68 23ms 13 Feb 2024 159th 77Tigers 765 68 16ms 22 Jun 2024 159th moustave 765 68 17ms 12 Nov 2024 172nd juliusgeo 754 69 16ms 13 Jan 2023 172nd jhu04 754 69 19ms 18 Jan 2024 172nd ImpressedByRocks 754 69 16ms 15 Nov 2024 175th jhpaques 🇫🇷 743 70 18ms 30 Nov 2022 175th michelebastione 🇮🇹 743 70 17ms 7 Dec 2022 175th Skwerl23 743 70 22ms 5 Feb 2023 175th celiendonze 🇨🇭 743 70 17ms 21 Apr 2023 175th epic-programmer-guy 743 70 17ms 20 Dec 2023 175th Stockoh 🇫🇷 743 70 267ms 24 Apr 2024 175th CutSandstone 743 70 16ms 5 Jul 2024 175th Andrey135296 743 70 16ms 25 Oct 2024 175th Emutis 🇱🇹 743 70 19ms 27 Oct 2024 184th Fishron 732 71 17ms 29 Nov 2022 184th wobblybits 732 71 19ms 29 Aug 2025 186th mbittner20 722 72 17ms 27 May 2023 186th eiburns 722 72 19ms 27 Oct 2023 186th WillowWispy 722 72 17ms 14 Mar 2025 189th Anthony-Williams-06 703 74 17ms 12 Sep 2024 190th CedricGebistorf 693 75 24ms 4 May 2023 190th namelessiw 693 75 26ms 11 Jan 2024 192nd jacksonhenry3 684 76 23ms 2 Dec 2022 192nd Irratix 🇳🇱 684 76 23ms 31 Jan 2023 192nd NoahBolohan 🇨🇦 684 76 27ms 8 Feb 2023 192nd Andrey2001 684 76 23ms 16 days ago 196th jakobkordez 🇸🇮 675 77 2,248ms 20 Nov 2022 197th Europe2048 667 78 32ms 4 Dec 2024 198th 051 🇸🇬 650 80 20ms 26 Dec 2023 199th btjones0 642 81 21ms 6 Dec 2022 199th rollershutter 642 81 24ms 4 Jul 2023 199th JunkIce 642 81 22ms 21 Nov 2024 199th Flekay 🇩🇪 642 81 21ms 10 Jul 2025 203rd hiichbindermax 634 82 21ms 17 Feb 2023 203rd scpchicken 🇵🇼 634 82 20ms 24 Feb 2023 205th wuzekai518 619 84 29ms 19 Jul 2024 205th HumanoidCPU 619 84 21ms 19 Feb 2025 207th RandGuy 612 85 25ms 23 Nov 2022 207th neihousaigaai 612 85 23ms 11 Feb 2024 207th alemelis 612 85 21ms 13 Oct 2024 210th SniperSmiley 🇺🇸 605 86 19ms 17 May 2023 210th Nic0M 605 86 26ms 6 Jul 2024 210th Mabeloid 🇳🇴 605 86 20ms 3 Oct 2024 213th Vaekor 598 87 30ms 9 Jul 2023 213th RaBa21 🇭🇺 598 87 20ms 10 Jul 2025 215th jtaxen 591 88 28ms 22 Jun 2023 215th Pale-Vessel 591 88 23ms 18 May 2024 215th AtengChen 591 88 21ms 25 Aug 2024 215th taesungh 591 88 29ms 7 Jun 2025 219th robin-scragg 584 89 30ms 25 Jul 2025 220th TheZwierzLF 🇵🇱 578 90 30ms 26 May 2025 220th SectorCorruptor 578 90 29ms 25 Sep 2025 222nd Mr-McChicken 571 91 23ms 4 Oct 2025 222nd madeforlosers 571 91 26ms 11 Nov 2025 224th Techdude01 565 92 336ms 19 Dec 2022 224th Jacob385 565 92 19ms 18 Apr 2024 226th FortuiteMan 🇫🇷 559 93 31ms 10 Oct 2024 227th mdnestor 553 94 21ms 23 Dec 2022 227th jfallon1997 553 94 23ms 4 Jan 2023 227th ThatAlo 553 94 27ms 13 Jun 2023 227th wh3n3v3r 🇨🇿 553 94 27ms 13 Nov 2024 231st PyryL 🇫🇮 547 95 33ms 27 Aug 2024 231st AstroOrbis 547 95 29ms 16 Jul 2025 233rd j-Ewan 542 96 34ms 9 Feb 2023 233rd NoneTheFewer 542 96 36ms 18 May 2024 235th ridingqwerty 🇺🇸 536 97 24ms 2 Jan 2024 236th mstang107 531 98 39ms 20 Dec 2023 236th adoxography 531 98 33ms 1 Sep 2025 238th JesseNoEyes 🇺🇸 525 99 31ms 20 Oct 2024 239th twocatsinatrenchcoat 520 100 25ms 20 Nov 2022 240th Florian-Mt 515 101 33ms 2 Oct 2023 First Prev 161–240 of 293 Next Last