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 chars. 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 Chars Time Submitted 481st primo-ppcg 🇹🇭 849 62 82ms 20 Nov 2022 482nd MarcMush 🇫🇷 848 49 514ms 11 Jan 2024 482nd antimon2 🇯🇵 848 49 346ms 5 May 2024 484th MeWhenI 🇻🇦 846 68 85ms 24 Dec 2024 484th pardouin 🇫🇷 846 68 139ms 23 Apr 2025 486th GrayJoKing 🇦🇺 845 73 44ms 26 Oct 2023 487th Shanethegamer 🇺🇸 845 80 389ms 26 Apr 2023 487th DialFrost 🇸🇬 845 80 431ms 3 Jun 2024 487th ovs-code 🇩🇪 845 80 427ms 23 Jul 2024 490th ovs-code 🇩🇪 845 149 509ms 27 Mar 2025 491st Shanethegamer 🇺🇸 844 54 360ms 16 Jan 2024 491st Yewzir 🇧🇪 844 54 388ms 24 Feb 2024 493rd emgordon154 844 133 1,931ms 9 hours ago 494th DialFrost 🇸🇬 843 81 24ms 23 Dec 2024 494th fuzzylojik-golf 🇺🇸 843 81 24ms 20 Aug 2025 496th QuincyNash 🇺🇸 842 59 21ms 1 Dec 2022 496th yzhs 🇩🇪 842 59 23ms 23 Jun 2023 496th AlexanderFair 842 59 23ms 18 Jul 2023 496th Grrisly 842 59 16ms 30 Mar 2024 500th m-tkach 🇺🇦 842 87 87ms 22 Nov 2022 500th sean-niemann 🇺🇸 842 87 70ms 7 Feb 2023 502nd GrayJoKing 🇦🇺 842 92 28ms 26 Oct 2023 503rd anter69 🇭🇺 837 47 54ms 24 Jan 2023 503rd emgordon154 837 47 49ms 19 Mar 2025 503rd Lv0Sys 🇵🇱 837 47 55ms 11 days ago 506th MeWhenI 🇻🇦 837 51 707ms 15 Sep 2025 506th dokutan 837 51 676ms 16 days ago 508th Steffan153 🇫🇮 837 56 28ms 9 Feb 2023 508th sean-niemann 🇺🇸 837 56 26ms 2 Aug 2024 510th MeWhenI 🇻🇦 837 64 52ms 9 Apr 2024 511th snoozingnewt 🇨🇦 837 96 120ms 20 days ago 512th ovs-code 🇩🇪 835 74 332ms 12 Nov 2023 513th duckyluuk 🇳🇱 833 69 93ms 25 Dec 2024 514th Steffan153 🇫🇮 833 75 49ms 22 Aug 2024 515th primo-ppcg 🇹🇭 833 82 25ms 20 Nov 2022 516th primo-ppcg 🇹🇭 832 135 1,735ms 15 Sep 2025 517th janbehrens 🇩🇪 831 50 500ms 11 Jul 2023 517th Yewzir 🇧🇪 831 50 387ms 26 Feb 2024 519th emgordon154 831 62 4,090ms 8 Nov 2024 520th lynn 830 31 138ms 16 Oct 2023 521st SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 522nd GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 522nd 5cw 🇺🇸 828 29 5ms 10 Apr 2023 522nd codereport 🇨🇦 828 29 3ms 17 May 2024 525th neel11235813 828 55 373ms 27 Mar 2024 525th dokutan 828 55 387ms 14 Jun 2024 527th janbehrens 🇩🇪 828 60 24ms 20 Nov 2022 527th Omega65536 🇩🇪 828 60 17ms 24 Nov 2022 527th Fracture17 828 60 19ms 13 Apr 2023 527th GolfingSuccess 🇬🇷 828 60 18ms 17 Oct 2023 527th bzijlema 🇳🇱 828 60 29ms 22 Jul 2024 527th bizy-coder 828 60 18ms 15 Aug 2024 533rd Ripick 827 69 155ms 8 Jan 2023 533rd dokutan 827 69 155ms 31 Dec 2023 533rd Yewzir 🇧🇪 827 69 168ms 14 Feb 2024 536th MeWhenI 🇻🇦 824 64 23ms 12 Dec 2023 536th emgordon154 824 64 23ms 10 Dec 2024 538th jared-hughes 823 89 57ms 20 Nov 2022 538th roupiq 🇵🇱 823 89 73ms 3 Jan 2024 538th Herbert00709 🇵🇱 823 89 75ms 7 Jun 2024 538th DialFrost 🇸🇬 823 89 64ms 17 Jun 2024 538th KasperKivimaeki 🇫🇮 823 89 60ms 11 days ago 543rd Yax42 🇫🇷 822 77 458ms 21 Apr 2025 544th snoozingnewt 🇨🇦 820 48 59ms 23 Oct 2025 545th ian-h-chamberlain 🇺🇸 815 84 141ms 2 days ago 546th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 547th KatieLG 🇬🇧 814 56 364ms 28 Oct 2024 548th Eilonlif 🇮🇱 814 61 17ms 9 Dec 2022 548th SirFireball3521 814 61 16ms 9 Mar 2023 548th minhtrancccp 814 61 19ms 11 Jan 2024 548th stertooy 🇧🇪 814 61 17ms 14 Jun 2024 552nd janbehrens 🇩🇪 814 83 420ms 20 Nov 2022 553rd Steffan153 🇫🇮 812 66 48ms 16 Jan 2023 553rd CLOStrophobic 🇮🇹 812 66 54ms 3 Mar 2025 555th MeWhenI 🇻🇦 812 155 461ms 28 Mar 2025 556th Steffan153 🇫🇮 811 35 342ms 23 Nov 2022 557th DialFrost 🇸🇬 808 139 1,670ms 13 Sep 2025 558th rucin93 🇵🇱 807 156 526ms 20 Mar 2025 559th snoozingnewt 🇨🇦 805 53 693ms 23 Oct 2025 560th GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 First Prev 481–560 of 1,799 Next Last