The Calendar hole will go live in approximately 2 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 roupiq 🇵🇱 609 83 672ms 18 Apr 2024 641st JonahEMorgan 609 83 18ms 10 Nov 2024 643rd MeWhenI 🇻🇦 609 182 68ms 1 Aug 2023 644th aksyristos 608 60 42ms 38 hours ago 645th SirBogman 🇺🇸 607 385 408ms 1 Aug 2023 646th SirBogman 🇺🇸 602 156 52ms 3 Jun 2025 647th MeWhenI 🇻🇦 597 235 1,689ms 7 Nov 2025 648th MeWhenI 🇻🇦 596 164 7ms 1 Aug 2023 649th OllyTDev 594 85 19ms 22 Aug 2023 649th NickTheEASDude 🇺🇸 594 85 109ms 20 Aug 2024 651st AlephSquirrel 589 57 15ms 21 Jan 2025 652nd Thinkr1 589 62 43ms 18 Nov 2025 653rd rustykitty 🇺🇸 588 86 18ms 31 Oct 2025 654th CatsAreFluffy 587 86 43ms 2 Jan 2024 655th davbass 🇮🇹 582 66 238ms 25 Aug 2023 656th madex 🇩🇪 582 168 12ms 21 Feb 2024 657th kmathis22 580 196 475ms 23 days ago 658th edsrzf 🇳🇿 579 63 42ms 3 days ago 659th RobertHoeh 574 88 207ms 16 May 2024 660th MeWhenI 🇻🇦 572 164 47ms 29 Apr 2025 661st namelessiw 572 199 467ms 15 Nov 2025 662nd Zekaroni 568 89 17ms 29 Aug 2023 662nd CatsAreFluffy 568 89 185ms 2 Jan 2024 662nd Aquateraneal 568 89 18ms 5 Nov 2025 665th MeWhenI 🇻🇦 565 172 399ms 15 Oct 2023 666th Yewzir 🇧🇪 564 244 268ms 3 Jan 2024 667th didion0 🇺🇸 561 90 11ms 24 Feb 2025 667th CaedenHarper 🇨🇦 561 90 172ms 6 Sep 2025 669th MeWhenI 🇻🇦 560 69 40ms 1 Aug 2023 670th Mabeloid 🇳🇴 557 235 120ms 26 Oct 2025 671st MeWhenI 🇻🇦 556 224 6ms 12 Jan 2025 672nd dokutan 555 248 271ms 6 Jan 2024 673rd adamnielson42 🇺🇸 552 70 547ms 17 Nov 2023 674th DialFrost 🇸🇬 552 177 5ms 11 Nov 2024 675th dokutan 552 237 120ms 11 Jan 2024 676th dokutan 551 240 205ms 1 Jul 2025 677th CatsAreFluffy 543 89 593ms 15 Jan 2024 678th roguh 🇬🇹 543 93 17ms 9 Jan 2024 679th albanian-laundromat 541 205 2ms 25 Jun 2025 680th KaustubhDighe 538 94 17ms 3 Nov 2023 681st CaedenHarper 🇨🇦 538 165 974ms 19 Oct 2025 682nd MeWhenI 🇻🇦 533 208 2ms 1 Aug 2023 682nd m-tkach 🇺🇦 533 208 2ms 1 Aug 2023 682nd dokutan 533 208 2ms 27 Mar 2024 685th elgan65536 532 246 121ms 11 Nov 2023 686th alexeldridge 526 96 144ms 27 Aug 2024 687th CaedenHarper 🇨🇦 518 266 275ms 4 Nov 2025 688th Yewzir 🇧🇪 515 215 2ms 18 Jan 2024 689th Schmitt-Very-Cool 515 221 1,051ms 1 Oct 2025 690th dokutan 512 236 89ms 23 Jul 2025 691st NoneTheFewer 510 99 18ms 19 days ago 692nd janbehrens 🇩🇪 508 165 3,519ms 4 Aug 2023 693rd Waffle3z 503 218 1ms 12 Sep 2023 694th inventshah 501 673 16ms 1 Aug 2023 695th janbehrens 🇩🇪 499 228 449ms 4 Aug 2023 696th dokutan 498 220 2ms 3 Apr 2024 697th CaedenHarper 🇨🇦 497 229 509ms 10 Oct 2025 698th MeWhenI 🇻🇦 497 263 155ms 1 Aug 2023 699th galloj 🇨🇿 492 686 84ms 14 Aug 2023 700th MeWhenI 🇻🇦 490 87 686ms 15 Sep 2025 701st dokutan 486 234 455ms 24 Sep 2025 702nd SirBogman 🇺🇸 485 98 480ms 11 Aug 2023 703rd Chinay-Domitrix 🇺🇸 483 137 3,729ms 15 Apr 2025 704th cbrt-x 482 236 795ms 15 Sep 2023 705th Code-Coder-coder 481 105 120ms 23 Nov 2025 706th Yewzir 🇧🇪 481 259 5ms 19 Dec 2024 707th Yewzir 🇧🇪 476 233 56ms 10 Nov 2023 708th snoozingnewt 🇨🇦 474 255 188ms 21 Nov 2025 709th MeWhenI 🇻🇦 472 140 3,450ms 2 Dec 2024 710th janbehrens 🇩🇪 472 188 348ms 4 Aug 2023 711th MeWhenI 🇻🇦 469 179 3,629ms 1 Aug 2023 712th Maximizer02 468 129 3,998ms 19 Apr 2024 713th snoozingnewt 🇨🇦 468 356 31ms 22 days ago 714th stefangimmillaro 466 83 76ms 1 Aug 2023 715th gigaprofisi 🇺🇸 464 109 17ms 2 Mar 2025 716th MeWhenI 🇻🇦 463 214 94ms 1 Aug 2023 717th dokutan 460 215 96ms 28 Mar 2024 718th dokutan 460 241 389ms 19 Aug 2024 719th MeWhenI 🇻🇦 451 195 3ms 12 Aug 2024 720th celiendonze 🇨🇭 447 113 70ms 3 Aug 2023 First Prev 641–720 of 1,718 Next Last