The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Pernicious Numbers 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 477th PaulMWeiser 471 85 9ms 4 Mar 2023 477th NoneTheFewer 471 85 10ms 18 May 2024 483rd qoqosz 465 86 9ms 6 Jun 2019 483rd tomh1012 465 86 15ms 9 Jun 2021 483rd JoaoFelipe3 465 86 16ms 15 Jan 2024 483rd Pale-Vessel 465 86 15ms 18 May 2024 483rd 0dyse 465 86 17ms 26 Sep 2025 488th alangodfrey 460 87 11ms 24 Jan 2019 488th TheZwierzLF 🇵🇱 460 87 16ms 26 May 2025 488th SectorCorruptor 460 87 9ms 25 Sep 2025 491st richard-oelze 🇩🇪 455 88 9ms 10 Feb 2021 492nd dave-ck 449 89 9ms 9 May 2018 492nd TheCod-r 🇦🇶 449 89 9ms 4 Mar 2022 492nd Techdude01 449 89 16ms 19 Dec 2022 492nd DanielPeterssonAI 449 89 9ms 18 Mar 2023 492nd Jacob385 449 89 9ms 13 Apr 2024 492nd Short-C0de 🇺🇸 449 89 9ms 14 Nov 2024 498th Secozzi 444 90 10ms 21 Mar 2021 498th potato-jackson 444 90 9ms 9 Sep 2021 498th pengu1n-master 444 90 9ms 11 Oct 2021 498th feherd 444 90 9ms 20 May 2022 498th ssbhatt4321 444 90 9ms 14 Oct 2023 498th webmiche 444 90 10ms 6 Nov 2025 504th karhuthebear 440 91 10ms 11 May 2022 504th mdnestor 440 91 9ms 23 Dec 2022 504th AstroOrbis 440 91 16ms 16 Jul 2025 507th jamesbtan 435 92 10ms 25 Mar 2019 507th schachmattmatt 435 92 9ms 22 Aug 2021 507th Bonjour27891 🇻🇳 435 92 16ms 19 Feb 2022 507th Drew-j-Smith 435 92 9ms 17 Apr 2022 507th jaxmattfair 🇺🇸 435 92 10ms 17 Jan 2023 507th shellbertt 🇨🇦 435 92 9ms 26 Feb 2023 507th Bit125 435 92 10ms 28 Mar 2024 514th DarkTemplar5 430 93 10ms 1 Nov 2020 514th bbakersmith 430 93 10ms 18 Jul 2021 514th j-Ewan 430 93 16ms 11 Mar 2022 514th cameronezell 430 93 9ms 19 Jun 2022 514th TheAtrossian 430 93 10ms 20 days ago 519th try-except-try-accept 🇹🇭 426 94 15ms 10 Jul 2022 519th madeforlosers 426 94 9ms 11 Nov 2025 521st opsullivan85 421 95 9ms 3 Jun 2019 521st bdendekk 421 95 9ms 10 Jul 2019 521st Trunksistor 🇫🇷 421 95 15ms 20 May 2022 521st Heathcorp 🇦🇺 421 95 15ms 24 Jun 2022 521st pfysches-boop 421 95 9ms 6 Aug 2023 521st madex 🇩🇪 421 95 15ms 9 Jul 2024 527th OpesMentis 417 96 9ms 21 Mar 2018 527th Y0UR-U5ERNAME 417 96 13ms 5 Sep 2021 527th myleopard 417 96 9ms 15 Oct 2021 527th JesseNoEyes 🇺🇸 417 96 16ms 20 Oct 2024 531st adoxography 412 97 17ms 10 Oct 2019 531st twocatsinatrenchcoat 412 97 9ms 11 May 2022 533rd AgathokakologicalBit 408 98 17ms 25 Jul 2019 533rd eshilo-draper 408 98 9ms 13 Sep 2022 533rd Florian-Mt 408 98 15ms 2 Oct 2023 533rd Ythaenagor 408 98 9ms 5 Aug 2024 533rd arjunarya1 408 98 9ms 11 Sep 2025 538th derekthatcher 404 99 15ms 23 Sep 2020 538th garrisonhh 404 99 15ms 21 Nov 2020 538th midnattssol 🇸🇪 404 99 9ms 27 Jul 2023 541st berdzi 400 100 14ms 23 Mar 2022 542nd dillon-duncando 396 101 15ms 3 Oct 2022 543rd ArturLange 392 102 16ms 5 Sep 2018 543rd evautier 392 102 9ms 15 May 2019 543rd ItsMeNoobieboy 392 102 10ms 23 Dec 2022 543rd stegosaurus21 392 102 9ms 29 Aug 2023 543rd jameswmccarty 392 102 16ms 7 Mar 2025 548th stordev 388 103 15ms 26 Feb 2021 548th mhenion8293 🇺🇸 388 103 15ms 19 Jan 2022 550th S-Ruban 385 104 9ms 25 Feb 2023 551st bkshrader 381 105 9ms 29 Dec 2018 551st danwley 381 105 9ms 5 Jan 2019 551st rpuneet 381 105 9ms 27 Sep 2019 551st Pena86 381 105 17ms 18 Feb 2021 555th TetroVolt 377 106 9ms 10 Sep 2018 555th hymanimy 377 106 9ms 6 Jun 2021 555th VV1Git 377 106 16ms 28 Mar 2023 558th CuboidRaptor 🇨🇦 374 107 10ms 19 Jan 2022 558th Feniske 🇫🇷 374 107 9ms 7 Oct 2022 558th tknight00 374 107 17ms 5 Mar 2024 First Prev 481–560 of 649 Next Last