The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Pernicious Numbers 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 463rd Betuaredead 935 55 114ms 11 Nov 2023 463rd dokutan 935 55 120ms 27 Mar 2024 463rd pardouin 🇫🇷 935 55 117ms 19 Aug 2024 463rd acotis 935 55 120ms 4 Feb 2025 463rd emgordon154 935 55 123ms 19 Mar 2025 463rd fuzzylojik-golf 🇺🇸 935 55 116ms 17 Jun 2025 463rd edsrzf 🇳🇿 935 55 117ms 22 Jul 2025 463rd kumavale 935 55 120ms 26 Aug 2025 463rd snoozingnewt 🇨🇦 935 55 115ms 20 Oct 2025 490th henkma 934 51 111ms 26 Jun 2020 490th lynn 934 51 113ms 8 Oct 2021 492nd edsrzf 🇳🇿 934 60 540ms 26 Sep 2025 492nd DialFrost 🇸🇬 934 60 442ms 26 Sep 2025 492nd sean-niemann 🇺🇸 934 60 455ms 26 Sep 2025 492nd JayXon 🇺🇸 934 60 435ms 26 Sep 2025 492nd pardouin 🇫🇷 934 60 546ms 26 Sep 2025 492nd fuzzylojik-golf 🇺🇸 934 60 488ms 26 Sep 2025 492nd namelessiw 934 60 435ms 2 Oct 2025 492nd Yewzir 🇧🇪 934 60 416ms 2 Oct 2025 492nd Yax42 🇫🇷 934 60 502ms 3 Oct 2025 492nd b-illy 🇬🇧 934 60 454ms 3 Oct 2025 492nd ovs-code 🇩🇪 934 60 435ms 3 Oct 2025 492nd CaedenHarper 🇨🇦 934 60 443ms 3 Oct 2025 492nd m-tkach 🇺🇦 934 60 633ms 3 Oct 2025 492nd stefangimmillaro 934 60 416ms 6 Oct 2025 492nd snoozingnewt 🇨🇦 934 60 522ms 20 Oct 2025 492nd sisyphus-ppcg 🇦🇺 934 60 485ms 23 days ago 492nd Lydxn 🇨🇦 934 60 347ms 7 days ago 492nd KasperKivimaeki 🇫🇮 934 60 377ms 7 days ago 510th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 510th lynn 933 18 2ms 27 May 2022 510th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 510th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 510th AdrienHache 🇫🇷 933 18 4ms 17 days ago 515th Waffle3z 933 30 35ms 10 Feb 2021 515th lynn 933 30 33ms 11 Sep 2021 515th Irratix 🇳🇱 933 30 36ms 22 Mar 2022 515th orthoplex 🇨🇽 933 30 35ms 30 Mar 2022 515th SirBogman 🇺🇸 933 30 41ms 31 May 2022 515th inventshah 933 30 32ms 18 Jun 2022 515th jared-hughes 933 30 32ms 10 Sep 2022 515th Shanethegamer 🇺🇸 933 30 35ms 6 Feb 2023 515th ovs-code 🇩🇪 933 30 38ms 17 Jul 2023 515th Betuaredead 933 30 37ms 11 Nov 2023 515th dokutan 933 30 43ms 26 Mar 2024 515th BREMAUCY 🇫🇷 933 30 45ms 14 May 2024 515th FlyingPenguin223 933 30 44ms 23 Oct 2024 515th emgordon154 933 30 45ms 18 Mar 2025 515th edsrzf 🇳🇿 933 30 42ms 26 Jul 2025 515th CaedenHarper 🇨🇦 933 30 35ms 13 Sep 2025 515th blaztoma 🇱🇹 933 30 41ms 9 hours ago 532nd Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 532nd sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 532nd rucin93 🇵🇱 933 33 2ms 18 Nov 2025 532nd edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 532nd DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 532nd JayXon 🇺🇸 933 33 1ms 19 Nov 2025 532nd GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 532nd pardouin 🇫🇷 933 33 1ms 19 Nov 2025 532nd snoozingnewt 🇨🇦 933 33 1ms 15 days ago 541st jared-hughes 933 49 1ms 16 Mar 2022 541st m-tkach 🇺🇦 933 49 1ms 15 Aug 2022 541st emgordon154 933 49 2ms 20 Mar 2025 544th Lydxn 🇨🇦 932 67 53ms 1 Jan 2022 544th prplz 🇦🇺 932 67 80ms 1 Jan 2022 544th JayXon 🇺🇸 932 67 57ms 1 Jan 2022 544th primo-ppcg 🇹🇭 932 67 73ms 18 Jan 2022 544th GrayJoKing 🇦🇺 932 67 75ms 18 Feb 2022 544th Irratix 🇳🇱 932 67 66ms 22 Mar 2022 544th inventshah 932 67 64ms 15 Jun 2022 544th sean-niemann 🇺🇸 932 67 56ms 4 Nov 2022 544th MeWhenI 🇻🇦 932 67 73ms 5 Nov 2022 544th Steffan153 🇫🇮 932 67 71ms 27 Nov 2022 544th DialFrost 🇸🇬 932 67 57ms 12 Jan 2023 544th Shanethegamer 🇺🇸 932 67 82ms 6 Feb 2023 544th Alex-x90 🇺🇸 932 67 64ms 24 Feb 2023 544th sisyphus-ppcg 🇦🇺 932 67 55ms 23 Mar 2023 544th rucin93 🇵🇱 932 67 65ms 20 Jun 2023 544th xsot 🇸🇬 932 67 63ms 14 Jul 2023 544th ovs-code 🇩🇪 932 67 72ms 17 Jul 2023 First Prev 481–560 of 3,299 Next Last