The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Pernicious Numbers (Long) in all languages 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 641st stefangimmillaro 788 113 268ms 22 Jun 2023 642nd sisyphus-ppcg 🇦🇺 785 45 13ms 23 Jan 2023 642nd Steffan153 🇫🇮 785 45 4ms 9 Feb 2023 642nd DialFrost 🇸🇬 785 45 4ms 25 Nov 2023 645th Yewzir 🇧🇪 783 43 903ms 13 Feb 2024 645th dokutan 783 43 981ms 30 Apr 2024 647th Steffan153 🇫🇮 783 84 6ms 16 Jul 2023 647th typeswitch-dev 🇵🇹 783 84 398ms 28 Jul 2023 647th GrayJoKing 🇦🇺 783 84 375ms 29 Jul 2023 650th targrik 782 60 7ms 16 Jan 2025 651st pardouin 🇫🇷 782 79 187ms 22 Apr 2025 652nd inventshah 781 69 5ms 29 Nov 2022 652nd xsot 🇸🇬 781 69 4ms 10 Feb 2024 652nd ovs-code 🇩🇪 781 69 5ms 10 Feb 2024 655th emgordon154 781 106 115ms 19 days ago 656th SirBogman 🇺🇸 780 33 332ms 22 Nov 2022 657th fourth-bit 779 65 19ms 11 Jul 2023 657th Bmrl7 779 65 18ms 24 Feb 2024 657th shelerr 779 65 26ms 22 Aug 2025 660th prplz 🇦🇺 778 41 229ms 19 Nov 2022 660th scpchicken 🇵🇼 778 41 294ms 20 Nov 2022 660th SirFireball3521 778 41 354ms 13 Mar 2023 663rd Steffan153 🇫🇮 778 72 98ms 20 Nov 2022 663rd emplv 🇱🇻 778 72 100ms 30 Nov 2022 665th albanian-laundromat 776 55 774ms 12 Sep 2025 666th Yewzir 🇧🇪 776 88 25ms 13 Feb 2024 667th Steffan153 🇫🇮 775 57 12ms 14 Jan 2023 667th sisyphus-ppcg 🇦🇺 775 57 11ms 20 Jul 2023 669th rak1507 🇬🇧 774 31 2ms 7 Jan 2023 669th Yewzir 🇧🇪 774 31 9ms 9 Dec 2023 669th snoozingnewt 🇨🇦 774 31 37ms 20 Sep 2025 672nd DialFrost 🇸🇬 773 181 52ms 23 May 2025 673rd xsot 🇸🇬 772 50 54ms 30 Jan 2024 674th pardouin 🇫🇷 772 76 10ms 24 Apr 2025 675th DialFrost 🇸🇬 772 80 184ms 5 Aug 2024 676th dokutan 771 95 71ms 23 Mar 2024 677th Yewzir 🇧🇪 770 90 435ms 12 Feb 2024 678th emplv 🇱🇻 769 61 7ms 21 Jun 2023 679th Yewzir 🇧🇪 769 68 123ms 14 Feb 2024 680th janbehrens 🇩🇪 768 116 274ms 20 Nov 2022 681st aksyristos 767 66 19ms 17 Jan 2023 681st OllieBoyne 🇬🇧 767 66 19ms 28 Feb 2023 681st randolchance 767 66 19ms 12 Mar 2023 681st CheeseCake628 🇳🇴 767 66 18ms 19 Mar 2023 681st adamnielson42 🇺🇸 767 66 17ms 31 Mar 2023 681st ehulinsky 🇺🇸 767 66 18ms 8 May 2023 681st TheoKeller1 767 66 17ms 11 Jun 2023 681st dranjohn 767 66 16ms 11 Sep 2023 681st inverseLorentz 🇦🇺 767 66 19ms 23 Oct 2023 681st RedzGoose 🇦🇺 767 66 19ms 23 Oct 2024 681st yokasuretsu 767 66 17ms 7 Jan 2025 681st croc54 767 66 17ms 13 Jan 2025 681st ejini6969 767 66 17ms 14 Jun 2025 681st osNiko 🇧🇷 767 66 17ms 20 Aug 2025 681st Troon 767 66 24ms 22 Aug 2025 696th Kaffeleif 767 71 24ms 8 Feb 2024 696th DialFrost 🇸🇬 767 71 24ms 15 Dec 2024 696th snoozingnewt 🇨🇦 767 71 28ms 9 Oct 2025 699th Irratix 🇳🇱 763 96 57ms 11 Dec 2022 700th AlephSquirrel 762 58 116ms 1 Jun 2023 701st JGDoerrer 761 90 125ms 20 Dec 2022 701st klixel 🇨🇦 761 90 124ms 17 Apr 2023 701st TylerBloom 761 90 118ms 22 Mar 2024 701st Aurel300 🇨🇭 761 90 119ms 8 Jun 2024 705th ovs-code 🇩🇪 759 70 23ms 14 Dec 2024 706th lynn 759 102 31ms 18 Jul 2023 706th m-tkach 🇺🇦 759 102 31ms 7 Dec 2023 708th tigerdan2 🇩🇪 758 92 450ms 18 days ago 709th SirBogman 🇺🇸 756 41 332ms 9 Jan 2024 709th dcgjb 756 41 1,753ms 31 Jan 2024 709th IISResetMe 756 41 313ms 10 Apr 2024 709th juliansiebert 🇩🇪 756 41 326ms 2 Feb 2025 713th snoozingnewt 🇨🇦 756 55 323ms 9 Oct 2025 714th bob-th 755 67 17ms 23 Dec 2022 714th n0Oo0Oo0b 755 67 18ms 29 Dec 2022 714th betaveros 755 67 32ms 31 Dec 2022 714th vgamula 🇺🇦 755 67 17ms 15 Mar 2023 714th VictorStenvers 🇳🇱 755 67 18ms 26 Mar 2025 719th DialFrost 🇸🇬 755 71 48ms 7 Dec 2024 720th Alex-x90 🇺🇸 755 97 66ms 20 Nov 2022 First Prev 641–720 of 1,816 Next Last