The Calendar hole will go live in approximately 7 days. Why not try and solve it ahead of time?
Happy Numbers in Java 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 1st sean-niemann 🇺🇸 1,000 89 337ms 24 Sep 2025 1st JayXon 🇺🇸 1,000 89 428ms 24 Sep 2025 1st nwellnhof 🇩🇪 1,000 89 451ms 25 Sep 2025 1st stefangimmillaro 1,000 89 437ms 6 Oct 2025 1st MeWhenI 🇻🇦 1,000 89 449ms 7 Nov 2025 1st DialFrost 🇸🇬 1,000 89 321ms 14 Nov 2025 1st h3ra993huskp 🇯🇵 1,000 89 459ms 24 days ago 1st ScottHamper 1,000 89 440ms 24 days ago 1st Lydxn 🇨🇦 1,000 89 355ms 12 days ago 10th namelessiw 989 90 468ms 3 Oct 2025 11th Yax42 🇫🇷 967 92 413ms 12 Nov 2025 12th snoozingnewt 🇨🇦 937 95 356ms 25 days ago 13th Yewzir 🇧🇪 908 98 386ms 2 Oct 2025 13th edsrzf 🇳🇿 908 98 379ms 2 hours ago 15th Jacob385 899 99 431ms 27 Oct 2025 16th dokutan 881 101 500ms 24 Sep 2025 17th jared-hughes 856 104 444ms 24 Sep 2025 18th Shanethegamer 🇺🇸 809 110 445ms 25 Sep 2025 19th kmathis22 802 111 413ms 20 Nov 2025 19th ethanlally 802 111 355ms 23 Nov 2025 19th KasperKivimaeki 🇫🇮 802 111 384ms 23 days ago 22nd CaedenHarper 🇨🇦 754 118 447ms 3 Oct 2025 23rd Babafaba 730 122 396ms 14 Oct 2025 24th primo-ppcg 🇹🇭 706 126 433ms 23 Jun 2021 24th Steffan153 🇫🇮 706 126 418ms 30 Nov 2022 26th xkacer 🇨🇿 695 128 428ms 20 Nov 2020 26th Schmitt-Very-Cool 695 128 422ms 30 Sep 2025 28th prplz 🇦🇺 685 130 366ms 24 Oct 2020 29th Apataras 679 131 397ms 25 Jul 2025 30th janbehrens 🇩🇪 664 134 373ms 26 Nov 2023 31st ravnskjaer 🇩🇰 654 136 332ms 9 days ago 32nd HumanoidCPU 650 137 648ms 8 Nov 2025 33rd inventshah 610 146 387ms 17 Jun 2022 34th Irratix 🇳🇱 605 147 419ms 11 Dec 2021 35th neihousaigaai 586 152 397ms 8 May 2021 36th boxjelly 582 153 401ms 17 Feb 2021 37th KatieLG 🇬🇧 578 154 427ms 24 Sep 2025 38th Liibe 571 156 427ms 25 Sep 2025 39th Re-Adventures 🇮🇳 567 157 385ms 8 Mar 2021 40th JunkIce 556 160 359ms 23 Feb 2025 41st cbrt-x 549 162 375ms 1 Sep 2021 42nd Natanaelel 🇸🇪 539 165 375ms 31 Mar 2022 43rd baumpilz 520 171 387ms 17 Dec 2020 44th KatieLG-Transpiler 🇬🇧 503 177 357ms 23 Jun 2022 45th xbxbxb007 500 178 397ms 11 Jan 2024 46th melikebuyruk 494 180 381ms 22 Mar 2021 46th yoshykai 494 180 390ms 15 Apr 2025 48th msbranicky 476 187 376ms 9 Jan 2024 49th yashima 473 188 494ms 21 Oct 2024 50th bac0id 464 192 376ms 30 Jun 2024 51st benradclyffe 459 194 404ms 15 May 2023 52nd sonisonjames 452 197 375ms 11 Dec 2022 53rd mokymok 🇺🇸 445 200 378ms 9 Nov 2021 53rd syspro86 445 200 548ms 31 Jul 2024 55th luca1339 430 207 382ms 9 May 2024 56th jiaminglimjm 🇲🇾 428 208 395ms 4 Jul 2020 57th retrohun 424 210 379ms 27 Dec 2022 57th Mabeloid 🇳🇴 424 210 386ms 20 Sep 2024 59th jonah1068 416 214 393ms 15 Sep 2023 60th zt14427 414 215 378ms 2 May 2023 61st bwat2 372 239 417ms 10 Mar 2022 62nd oeL87 319 279 421ms 29 Apr 2024 63rd DaCuteRaccoon 276 322 410ms 30 Nov 2022 64th theunofficialcoder 275 324 420ms 21 Jan 2024 65th Grimmjow91 259 344 405ms 3 Jun 2020 66th gianlab 241 369 399ms 30 Apr 2020 67th arvindrajarajan08 199 447 423ms 28 Aug 2025 68th tejokumar 179 496 412ms 22 Jan 2022 69th oganaa 159 559 380ms 6 Feb 2023 70th PierceZ 109 818 431ms 29 Nov 2023 1–70 of 70
