The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Kaprekar 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 639th Shanethegamer 🇺🇸 196 445 145ms 1 Nov 2024 639th dokutan 196 445 171ms 1 Nov 2024 639th MeWhenI 🇻🇦 196 445 97ms 2 Nov 2024 639th CaedenHarper 🇨🇦 196 445 104ms 16 Aug 2025 645th HumanoidCPU 196 519 111ms 1 Nov 2024 645th Shanethegamer 🇺🇸 196 519 110ms 1 Nov 2024 645th KatieLG 🇬🇧 196 519 117ms 1 Nov 2024 645th dokutan 196 519 112ms 1 Nov 2024 645th MeWhenI 🇻🇦 196 519 112ms 2 Nov 2024 645th CaedenHarper 🇨🇦 196 519 108ms 25 Jan 2025 651st QeepQeep 196 2,960 2ms 10 Nov 2024 651st Short-C0de 🇺🇸 196 2,960 2ms 14 Nov 2024 653rd brimstonetrader 194 353 718ms 5 Nov 2024 654th CLOStrophobic 🇮🇹 192 356 4,314ms 9 Feb 2025 655th CommandLeo 🇮🇹 191 359 9ms 8 Oct 2025 656th HumanoidCPU 189 449 41ms 1 Nov 2024 656th dokutan 189 449 39ms 1 Nov 2024 656th KatieLG 🇬🇧 189 449 39ms 1 Nov 2024 656th Shanethegamer 🇺🇸 189 449 40ms 1 Nov 2024 656th MeWhenI 🇻🇦 189 449 41ms 2 Nov 2024 656th CaedenHarper 🇨🇦 189 449 42ms 16 Aug 2025 656th gigaprofisi 🇺🇸 189 449 41ms 5 Nov 2025 663rd Shanethegamer 🇺🇸 187 444 65ms 22 Nov 2024 664th HumanoidCPU 186 446 71ms 27 Jan 2025 665th KatieLG 🇬🇧 186 1,387 4ms 1 Nov 2024 666th KatieLG 🇬🇧 185 447 74ms 1 Nov 2024 666th MeWhenI 🇻🇦 185 447 62ms 2 Nov 2024 666th CaedenHarper 🇨🇦 185 447 65ms 25 Jan 2025 669th HumanoidCPU 182 515 4ms 1 Nov 2024 670th HumanoidCPU 181 449 116ms 1 Nov 2024 670th dokutan 181 449 116ms 1 Nov 2024 670th KatieLG 🇬🇧 181 449 122ms 1 Nov 2024 670th Shanethegamer 🇺🇸 181 449 124ms 1 Nov 2024 670th MeWhenI 🇻🇦 181 449 126ms 2 Nov 2024 670th CaedenHarper 🇨🇦 181 449 120ms 16 Aug 2025 676th HumanoidCPU 178 460 108ms 1 Nov 2024 676th dokutan 178 460 110ms 1 Nov 2024 676th MeWhenI 🇻🇦 178 460 110ms 2 Nov 2024 676th klixel 🇨🇦 178 460 109ms 15 Nov 2024 676th Shanethegamer 🇺🇸 178 460 110ms 20 Feb 2025 676th CaedenHarper 🇨🇦 178 460 108ms 16 Aug 2025 682nd dokutan 176 475 63ms 1 Nov 2024 682nd Shanethegamer 🇺🇸 176 475 48ms 1 Nov 2024 682nd CaedenHarper 🇨🇦 176 475 67ms 23 Jan 2025 682nd HumanoidCPU 176 475 66ms 20 days ago 686th dokutan 174 434 41ms 1 Nov 2024 687th Blendi-Goose 173 387 2ms 7 Oct 2025 688th adamnielson42 🇺🇸 173 395 4,303ms 3 Dec 2024 689th MeWhenI 🇻🇦 173 455 39ms 2 Nov 2024 690th dokutan 172 470 756ms 24 Sep 2025 690th Jacob385 172 470 406ms 27 Oct 2025 690th HumanoidCPU 172 470 433ms 8 Nov 2025 693rd HumanoidCPU 171 441 55ms 1 Nov 2024 693rd KatieLG 🇬🇧 171 441 35ms 1 Nov 2024 693rd Shanethegamer 🇺🇸 171 441 47ms 1 Nov 2024 693rd MeWhenI 🇻🇦 171 441 39ms 2 Nov 2024 693rd CaedenHarper 🇨🇦 171 441 55ms 25 Jan 2025 698th ocefra 170 393 96ms 25 Dec 2024 699th Shanethegamer 🇺🇸 170 471 455ms 1 Nov 2024 700th MeWhenI 🇻🇦 170 472 435ms 2 Nov 2024 700th CaedenHarper 🇨🇦 170 472 450ms 24 Jan 2025 700th dokutan 170 472 390ms 7 Nov 2025 703rd KatieLG 🇬🇧 170 483 164ms 18 days ago 704th HumanoidCPU 169 473 435ms 1 Nov 2024 705th HumanoidCPU 167 455 2ms 1 Nov 2024 705th dokutan 167 455 2ms 1 Nov 2024 705th KatieLG 🇬🇧 167 455 2ms 1 Nov 2024 705th Shanethegamer 🇺🇸 167 455 2ms 1 Nov 2024 705th MeWhenI 🇻🇦 167 455 2ms 2 Nov 2024 705th CaedenHarper 🇨🇦 167 455 2ms 16 Aug 2025 711th KatieLG 🇬🇧 167 472 42ms 1 Nov 2024 712th Shanethegamer 🇺🇸 166 450 606ms 16 Apr 2025 712th KatieLG 🇬🇧 166 450 579ms 20 Apr 2025 712th dokutan 166 450 577ms 23 Jul 2025 712th HumanoidCPU 166 450 590ms 18 Aug 2025 712th MeWhenI 🇻🇦 166 450 601ms 15 Sep 2025 717th HumanoidCPU 166 458 355ms 1 Nov 2024 717th Shanethegamer 🇺🇸 166 458 349ms 1 Nov 2024 717th KatieLG 🇬🇧 166 458 360ms 1 Nov 2024 717th dokutan 166 458 347ms 1 Nov 2024 First Prev 641–720 of 988 Next Last