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 721st msbranicky 745 92 123ms 1 Oct 2023 722nd janbehrens 🇩🇪 745 116 274ms 20 Nov 2022 723rd janbehrens 🇩🇪 744 63 15ms 20 Nov 2022 724th Yewzir 🇧🇪 744 72 27ms 6 Mar 2024 725th Kaffeleif 742 71 24ms 8 Feb 2024 725th DialFrost 🇸🇬 742 71 24ms 15 Dec 2024 725th snoozingnewt 🇨🇦 742 71 28ms 9 Oct 2025 728th dokutan 742 92 26ms 24 days ago 729th bob-th 741 67 17ms 23 Dec 2022 729th n0Oo0Oo0b 741 67 18ms 29 Dec 2022 729th betaveros 741 67 32ms 31 Dec 2022 729th vgamula 🇺🇦 741 67 17ms 15 Mar 2023 729th HumanoidCPU 741 67 22ms 19 Feb 2025 729th VictorStenvers 🇳🇱 741 67 18ms 26 Mar 2025 735th janbehrens 🇩🇪 740 99 66ms 20 Nov 2022 735th Yewzir 🇧🇪 740 99 84ms 12 Feb 2024 737th Steffan153 🇫🇮 738 65 1,803ms 14 Jan 2023 738th thisishowmymindworks 🇳🇴 737 60 12ms 19 Jun 2024 738th stefangimmillaro 737 60 12ms 4 Sep 2024 738th targrik 737 60 12ms 6 Feb 2025 738th Lv0Sys 🇵🇱 737 60 13ms 11 days ago 742nd m-tkach 🇺🇦 736 72 4ms 22 Nov 2022 742nd emplv 🇱🇻 736 72 4ms 30 Nov 2022 742nd Steffan153 🇫🇮 736 72 4ms 3 Jan 2023 742nd sean-niemann 🇺🇸 736 72 5ms 7 May 2024 742nd solisolu 736 72 4ms 19 Nov 2025 747th dokutan 735 92 439ms 15 Jul 2025 748th rucin93 🇵🇱 734 63 9ms 18 Nov 2025 749th snoozingnewt 🇨🇦 733 118 261ms 9 Oct 2025 750th h3ra993huskp 🇯🇵 732 94 488ms 18 days ago 751st Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 752nd GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 753rd MaxElf999 730 68 17ms 21 Nov 2022 753rd guilhem-roy 🇫🇷 730 68 16ms 21 Nov 2022 753rd knutae 🇳🇴 730 68 18ms 30 Nov 2022 753rd 4ndyJ 🇬🇧 730 68 16ms 10 Jan 2023 753rd andre-lameirinhas 🇵🇹 730 68 17ms 18 May 2023 753rd WillConker 730 68 20ms 16 Jul 2023 753rd AforAmpere 730 68 16ms 20 Sep 2023 753rd Simpos 730 68 30ms 24 Oct 2023 753rd mikehanus 730 68 19ms 22 Nov 2023 753rd chartung17 730 68 17ms 31 Dec 2023 753rd mathisfun271 730 68 23ms 13 Feb 2024 753rd 77Tigers 730 68 16ms 22 Jun 2024 753rd moustave 730 68 17ms 12 Nov 2024 766th MeWhenI 🇻🇦 729 57 387ms 14 Feb 2023 766th masflam 729 57 431ms 21 Jun 2024 768th dokutan 727 33 36ms 20 Oct 2024 769th annaproxy 727 85 243ms 22 Nov 2022 769th Natanaelel 🇸🇪 727 85 251ms 27 Apr 2025 771st emgordon154 726 119 255ms 19 Mar 2025 772nd Chinay-Domitrix 🇺🇸 725 71 4,937ms 2 Apr 2025 773rd jared-hughes 724 61 12ms 20 Nov 2022 773rd janbehrens 🇩🇪 724 61 12ms 20 Nov 2022 773rd tayloia 🇬🇧 724 61 11ms 9 Jan 2023 773rd iczelia 🇩🇪 724 61 12ms 5 Nov 2025 777th msbranicky 723 63 570ms 16 Jan 2024 778th Shanethegamer 🇺🇸 722 73 57ms 18 Dec 2023 778th steffan-polygolf 722 73 25ms 7 Mar 2024 780th primo-ppcg 🇹🇭 721 43 352ms 20 Nov 2022 781st snoozingnewt 🇨🇦 720 68 119ms 8 Oct 2023 781st rboath 720 68 2,066ms 11 Dec 2024 783rd juliusgeo 720 69 16ms 13 Jan 2023 783rd jhu04 720 69 19ms 18 Jan 2024 783rd ImpressedByRocks 720 69 16ms 15 Nov 2024 786th prplz 🇦🇺 718 86 243ms 16 Jan 2023 787th alemelis 717 58 539ms 29 Aug 2024 788th error256 716 55 59ms 4 Jun 2024 789th Alex-x90 🇺🇸 716 74 4ms 20 Nov 2022 789th jared-hughes 716 74 4ms 20 Nov 2022 791st MeWhenI 🇻🇦 715 36 421ms 30 Dec 2023 792nd dokutan 715 72 2,687ms 3 days ago 793rd edsrzf 🇳🇿 715 82 29ms 9 Sep 2025 794th syntax-rules 714 75 52ms 15 May 2023 795th Alex-x90 🇺🇸 713 62 12ms 14 Jan 2023 795th m-tkach 🇺🇦 713 62 13ms 20 Mar 2023 795th emgordon154 713 62 12ms 19 Mar 2025 795th Yax42 🇫🇷 713 62 11ms 6 Sep 2025 799th emgordon154 711 95 531ms 28 May 2025 800th primo-ppcg 🇹🇭 710 40 282ms 20 Nov 2022 First Prev 721–800 of 1,799 Next Last