The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
ln 2 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 641st SirBogman 🇺🇸 607 385 408ms 1 Aug 2023 642nd SirBogman 🇺🇸 602 156 52ms 3 Jun 2025 643rd MeWhenI 🇻🇦 597 235 1,689ms 7 Nov 2025 644th MeWhenI 🇻🇦 596 164 7ms 1 Aug 2023 645th OllyTDev 594 85 19ms 22 Aug 2023 645th NickTheEASDude 🇺🇸 594 85 109ms 20 Aug 2024 647th AlephSquirrel 589 57 15ms 21 Jan 2025 648th Thinkr1 588 62 43ms 18 Nov 2025 649th CatsAreFluffy 587 86 43ms 2 Jan 2024 649th rustykitty 🇺🇸 587 86 18ms 31 Oct 2025 651st davbass 🇮🇹 582 66 238ms 25 Aug 2023 652nd madex 🇩🇪 582 168 12ms 21 Feb 2024 653rd kmathis22 580 196 475ms 19 days ago 654th RobertHoeh 574 88 207ms 16 May 2024 655th MeWhenI 🇻🇦 572 164 47ms 29 Apr 2025 656th namelessiw 572 199 467ms 15 Nov 2025 657th Zekaroni 568 89 17ms 29 Aug 2023 657th CatsAreFluffy 568 89 185ms 2 Jan 2024 657th Aquateraneal 568 89 18ms 5 Nov 2025 660th MeWhenI 🇻🇦 565 172 399ms 15 Oct 2023 661st Yewzir 🇧🇪 564 244 268ms 3 Jan 2024 662nd didion0 🇺🇸 561 90 11ms 24 Feb 2025 662nd CaedenHarper 🇨🇦 561 90 172ms 6 Sep 2025 664th MeWhenI 🇻🇦 560 69 40ms 1 Aug 2023 665th Mabeloid 🇳🇴 557 235 120ms 26 Oct 2025 666th MeWhenI 🇻🇦 556 224 6ms 12 Jan 2025 667th dokutan 555 248 271ms 6 Jan 2024 668th adamnielson42 🇺🇸 552 70 547ms 17 Nov 2023 669th DialFrost 🇸🇬 552 177 5ms 11 Nov 2024 670th dokutan 552 237 120ms 11 Jan 2024 671st dokutan 551 240 205ms 1 Jul 2025 672nd CatsAreFluffy 543 89 593ms 15 Jan 2024 673rd roguh 🇬🇹 543 93 17ms 9 Jan 2024 674th albanian-laundromat 541 205 2ms 25 Jun 2025 675th CaedenHarper 🇨🇦 538 165 974ms 19 Oct 2025 676th KaustubhDighe 537 94 17ms 3 Nov 2023 677th MeWhenI 🇻🇦 533 208 2ms 1 Aug 2023 677th m-tkach 🇺🇦 533 208 2ms 1 Aug 2023 677th dokutan 533 208 2ms 27 Mar 2024 680th elgan65536 532 246 121ms 11 Nov 2023 681st alexeldridge 526 96 144ms 27 Aug 2024 682nd CaedenHarper 🇨🇦 518 266 275ms 4 Nov 2025 683rd Yewzir 🇧🇪 515 215 2ms 18 Jan 2024 684th Schmitt-Very-Cool 515 221 1,051ms 1 Oct 2025 685th dokutan 512 236 89ms 23 Jul 2025 686th NoneTheFewer 510 99 18ms 15 days ago 687th janbehrens 🇩🇪 508 165 3,519ms 4 Aug 2023 688th Waffle3z 503 218 1ms 12 Sep 2023 689th inventshah 501 673 16ms 1 Aug 2023 690th janbehrens 🇩🇪 499 228 449ms 4 Aug 2023 691st dokutan 498 220 2ms 3 Apr 2024 692nd CaedenHarper 🇨🇦 497 229 509ms 10 Oct 2025 693rd MeWhenI 🇻🇦 497 263 155ms 1 Aug 2023 694th galloj 🇨🇿 492 686 84ms 14 Aug 2023 695th MeWhenI 🇻🇦 490 87 686ms 15 Sep 2025 696th dokutan 486 234 455ms 24 Sep 2025 697th SirBogman 🇺🇸 485 98 480ms 11 Aug 2023 698th Chinay-Domitrix 🇺🇸 483 137 3,729ms 15 Apr 2025 699th cbrt-x 482 236 795ms 15 Sep 2023 700th Code-Coder-coder 481 105 120ms 23 Nov 2025 701st Yewzir 🇧🇪 481 259 5ms 19 Dec 2024 702nd Yewzir 🇧🇪 476 233 56ms 10 Nov 2023 703rd snoozingnewt 🇨🇦 474 255 188ms 21 Nov 2025 704th MeWhenI 🇻🇦 472 140 3,450ms 2 Dec 2024 705th janbehrens 🇩🇪 472 188 348ms 4 Aug 2023 706th MeWhenI 🇻🇦 469 179 3,629ms 1 Aug 2023 707th Maximizer02 468 129 3,998ms 19 Apr 2024 708th snoozingnewt 🇨🇦 468 356 31ms 18 days ago 709th stefangimmillaro 466 83 76ms 1 Aug 2023 710th gigaprofisi 🇺🇸 464 109 17ms 2 Mar 2025 711th MeWhenI 🇻🇦 463 214 94ms 1 Aug 2023 712th dokutan 460 215 96ms 28 Mar 2024 713th dokutan 460 241 389ms 19 Aug 2024 714th MeWhenI 🇻🇦 451 195 3ms 12 Aug 2024 715th celiendonze 🇨🇭 447 113 70ms 3 Aug 2023 715th gigaprofisi 🇺🇸 447 113 729ms 1 Sep 2025 717th frosster 447 245 2ms 13 Mar 2025 718th dokutan 446 197 3ms 12 Aug 2024 719th WillowWispy 443 114 157ms 17 Mar 2025 720th snoozingnewt 🇨🇦 442 176 327ms 22 Nov 2025 First Prev 641–720 of 1,713 Next Last