The Calendar hole will go live in approximately 7 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 480th ovs-code 🇩🇪 856 52 55ms 10 Oct 2024 482nd kg583 🇺🇸 856 69 47ms 13 Feb 2025 482nd pardouin 🇫🇷 856 69 52ms 25 Apr 2025 482nd DialFrost 🇸🇬 856 69 50ms 25 Apr 2025 485th emplv 🇱🇻 853 80 24ms 30 Nov 2022 486th MeWhenI 🇻🇦 852 64 23ms 12 Dec 2023 486th emgordon154 852 64 23ms 10 Dec 2024 486th error256 852 64 25ms 5 hours ago 489th Steffan153 🇫🇮 852 86 59ms 14 Jan 2023 489th tailorspy 852 86 62ms 24 May 2024 489th snyderek 🇺🇸 852 86 57ms 13 Oct 2024 492nd kg583 🇺🇸 850 63 47ms 26 Aug 2025 493rd primo-ppcg 🇹🇭 849 62 82ms 20 Nov 2022 494th Shanethegamer 🇺🇸 848 49 453ms 10 Dec 2023 495th Yewzir 🇧🇪 846 56 379ms 24 Feb 2024 496th MeWhenI 🇻🇦 846 68 85ms 24 Dec 2024 497th GrayJoKing 🇦🇺 845 73 44ms 26 Oct 2023 498th Shanethegamer 🇺🇸 845 82 389ms 21 Nov 2022 499th ovs-code 🇩🇪 845 149 509ms 27 Mar 2025 500th primo-ppcg 🇹🇭 844 135 1,735ms 15 Sep 2025 501st janbehrens 🇩🇪 843 60 24ms 20 Nov 2022 501st Omega65536 🇩🇪 843 60 17ms 24 Nov 2022 501st Just4FunCoder 843 60 16ms 24 Mar 2023 501st Fracture17 843 60 19ms 13 Apr 2023 501st GolfingSuccess 🇬🇷 843 60 18ms 17 Oct 2023 501st steffan-polygolf 843 60 18ms 14 Feb 2024 501st bzijlema 🇳🇱 843 60 29ms 22 Jul 2024 501st bizy-coder 843 60 18ms 15 Aug 2024 501st keelimeguy 🇺🇸 843 60 19ms 15 May 2025 510th DialFrost 🇸🇬 843 81 24ms 23 Dec 2024 510th fuzzylojik-golf 🇺🇸 843 81 24ms 20 Aug 2025 512th DialFrost 🇸🇬 842 57 83ms 5 days ago 513th m-tkach 🇺🇦 842 87 62ms 22 Nov 2022 513th sean-niemann 🇺🇸 842 87 62ms 7 Feb 2023 515th GrayJoKing 🇦🇺 842 92 28ms 26 Oct 2023 516th dokutan 840 49 52ms 30 Apr 2024 517th MeWhenI 🇻🇦 837 51 707ms 15 Sep 2025 517th dokutan 837 51 676ms 21 days ago 519th Steffan153 🇫🇮 837 56 30ms 9 Feb 2023 519th sean-niemann 🇺🇸 837 56 28ms 2 Aug 2024 521st MeWhenI 🇻🇦 837 64 52ms 9 Apr 2024 522nd ovs-code 🇩🇪 835 74 332ms 12 Nov 2023 523rd janbehrens 🇩🇪 835 83 420ms 20 Nov 2022 524th duckyluuk 🇳🇱 833 69 92ms 25 Dec 2024 525th Yax42 🇫🇷 833 77 455ms 21 Apr 2025 526th primo-ppcg 🇹🇭 833 82 25ms 20 Nov 2022 527th janbehrens 🇩🇪 831 50 360ms 11 Jul 2023 528th dokutan 831 57 361ms 7 Apr 2024 529th emgordon154 831 62 3,311ms 8 Nov 2024 530th lynn 830 31 138ms 16 Oct 2023 531st Eilonlif 🇮🇱 830 61 17ms 9 Dec 2022 531st SirFireball3521 830 61 16ms 9 Mar 2023 531st minhtrancccp 830 61 19ms 11 Jan 2024 531st stertooy 🇧🇪 830 61 17ms 14 Jun 2024 535th SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 536th GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 536th 5cw 🇺🇸 828 29 5ms 10 Apr 2023 536th codereport 🇨🇦 828 29 3ms 17 May 2024 539th snoozingnewt 🇨🇦 828 100 120ms 25 days ago 540th Ripick 827 69 155ms 8 Jan 2023 540th dokutan 827 69 155ms 31 Dec 2023 540th Yewzir 🇧🇪 827 69 168ms 14 Feb 2024 543rd AlephSquirrel 824 50 42ms 7 Mar 2023 543rd SirBogman 🇺🇸 824 50 48ms 10 Jan 2024 545th jared-hughes 823 89 57ms 20 Nov 2022 545th roupiq 🇵🇱 823 89 60ms 3 Jan 2024 545th Herbert00709 🇵🇱 823 89 62ms 7 Jun 2024 545th DialFrost 🇸🇬 823 89 64ms 17 Jun 2024 545th KasperKivimaeki 🇫🇮 823 89 60ms 17 days ago 550th DialFrost 🇸🇬 820 139 1,670ms 13 Sep 2025 551st KatieLG 🇬🇧 816 62 16ms 26 Nov 2022 551st suwat513 816 62 17ms 6 Dec 2022 551st StefanHabel 🇨🇦 816 62 19ms 19 Dec 2022 551st Ripick 816 62 23ms 1 Feb 2023 551st quimey 816 62 17ms 8 Mar 2023 551st firegene 🇮🇪 816 62 16ms 2 Apr 2023 551st yzhs 🇩🇪 816 62 23ms 23 Jun 2023 551st Andriamanitra 🇫🇮 816 62 17ms 17 Jul 2023 551st Re-Adventures 🇮🇳 816 62 18ms 20 Jul 2023 551st fkantelberg 816 62 17ms 12 Aug 2023 First Prev 481–560 of 1,820 Next Last