The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
Prime Numbers in Java 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 1st JayXon 🇺🇸 1,000 66 579ms 24 Sep 2025 1st sean-niemann 🇺🇸 1,000 66 410ms 24 Sep 2025 1st namelessiw 1,000 66 450ms 4 Oct 2025 1st MeWhenI 🇻🇦 1,000 66 556ms 7 Nov 2025 5th nwellnhof 🇩🇪 943 70 437ms 25 Sep 2025 5th DialFrost 🇸🇬 943 70 315ms 13 Nov 2025 5th KasperKivimaeki 🇫🇮 943 70 398ms 21 days ago 5th Lydxn 🇨🇦 943 70 344ms 9 days ago 9th edsrzf 🇳🇿 930 71 427ms 24 Sep 2025 9th b-illy 🇬🇧 930 71 437ms 24 Sep 2025 9th voytxt 🇨🇿 930 71 495ms 25 Sep 2025 9th stefangimmillaro 930 71 443ms 6 Oct 2025 9th h3ra993huskp 🇯🇵 930 71 605ms 23 days ago 9th ScottHamper 930 71 444ms 23 days ago 9th fuzzylojik-golf 🇺🇸 930 71 360ms 56 mins ago 16th Shanethegamer 🇺🇸 868 76 436ms 25 Sep 2025 16th Yewzir 🇧🇪 868 76 455ms 2 Oct 2025 16th kmathis22 868 76 445ms 24 Oct 2025 16th Jacob385 868 76 446ms 27 Oct 2025 20th WildTooth 835 79 437ms 9 Oct 2025 21st dokutan 795 83 740ms 24 Sep 2025 22nd Liibe 776 85 395ms 25 Sep 2025 23rd snoozingnewt 🇨🇦 767 86 419ms 17 days ago 24th ethanlally 750 88 439ms 5 Nov 2025 25th CaedenHarper 🇨🇦 725 91 462ms 24 Sep 2025 26th Schmitt-Very-Cool 717 92 476ms 3 Oct 2025 27th squid233 710 93 400ms 7 Nov 2025 27th HumanoidCPU 710 93 419ms 8 Nov 2025 29th primo-ppcg 🇹🇭 641 103 414ms 24 Apr 2020 29th prplz 🇦🇺 641 103 420ms 18 Nov 2020 29th Steffan153 🇫🇮 641 103 404ms 9 Aug 2024 32nd Attero 🇸🇪 611 108 416ms 28 Apr 2020 32nd KatieLG 🇬🇧 611 108 478ms 22 Oct 2021 32nd Widgitty 611 108 390ms 18 Jul 2023 35th Looney32768 600 110 404ms 27 Jan 2023 36th BBoehm 🇩🇪 595 111 423ms 29 Oct 2020 36th helbling 🇨🇭 595 111 400ms 11 Mar 2024 38th janbehrens 🇩🇪 584 113 421ms 3 Sep 2020 38th KrausRaus 🇺🇸 584 113 402ms 22 Mar 2021 38th neihousaigaai 584 113 401ms 6 Apr 2021 38th inventshah 584 113 390ms 20 Apr 2021 38th Irratix 🇳🇱 584 113 395ms 7 Dec 2021 38th Betuaredead 584 113 637ms 14 Nov 2023 38th SirBogman 🇺🇸 584 113 404ms 3 Jan 2024 38th yoshykai 584 113 412ms 30 Mar 2025 38th eMGeeneer 584 113 392ms 20 Sep 2025 47th madeforlosers 579 114 401ms 5 Jan 2024 47th sultan 579 114 388ms 27 Mar 2024 49th cbrt-x 564 117 398ms 29 Aug 2021 49th Leftykap 564 117 391ms 14 Sep 2022 49th FlorianCassayre 🇫🇷 564 117 418ms 28 Sep 2022 49th piano-miles 564 117 373ms 7 Feb 2023 53rd Rhinozz 🇨🇦 559 118 387ms 12 Aug 2021 54th lukehewittvandy 555 119 418ms 19 Jul 2022 55th shellbertt 🇨🇦 550 120 437ms 26 Dec 2021 56th jjstreet 545 121 422ms 30 Apr 2020 57th Antonio-Vel 541 122 403ms 20 Aug 2022 57th mathb0y512 541 122 403ms 14 Nov 2022 59th konst-aa 537 123 381ms 11 Aug 2022 60th bwat2 532 124 433ms 21 Apr 2022 60th CarsonChr 🇺🇸 532 124 402ms 26 Jul 2024 62nd coltraloz 🇪🇸 528 125 401ms 6 Mar 2025 63rd ricehens 524 126 423ms 26 Nov 2021 63rd Carloz69 524 126 566ms 3 Dec 2021 65th bac0id 520 127 406ms 26 Sep 2023 66th Re-Adventures 🇮🇳 516 128 389ms 17 Mar 2021 67th richard-oelze 🇩🇪 512 129 393ms 1 May 2021 68th tomh1012 508 130 426ms 9 Oct 2020 68th Luca2812 508 130 412ms 30 Dec 2021 68th lorenzosim 508 130 409ms 5 Aug 2022 68th cnelson20 508 130 409ms 8 Aug 2022 68th GWStuart 508 130 393ms 1 Jul 2024 73rd tkr-sh 🇰🇵 504 131 416ms 4 May 2022 73rd lordsnek 504 131 372ms 26 Jan 2024 75th caynraiser 500 132 475ms 8 Dec 2021 76th Kusarr 496 133 408ms 17 Dec 2020 76th Bolix7 496 133 410ms 23 May 2021 76th astdefu 496 133 700ms 13 Dec 2022 76th gigaprofisi 🇺🇸 496 133 362ms 7 Mar 2025 80th eecb 493 134 412ms 24 Nov 2020 1–80 of 170 Next Last