The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
√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 561st cduerm 831 108 286ms 12 May 2020 561st elgan65536 831 108 286ms 23 Oct 2023 563rd ovs-code 🇩🇪 831 144 504ms 29 Mar 2025 564th primo-ppcg 🇹🇭 831 157 487ms 16 Jan 2021 565th jared-hughes 829 122 22ms 23 Sep 2025 566th DialFrost 🇸🇬 828 90 529ms 26 Oct 2023 567th MeWhenI 🇻🇦 827 56 3,508ms 2 Dec 2024 567th perlebach 🇨🇿 827 56 3,315ms 7 Jun 2025 567th Chinay-Domitrix 🇺🇸 827 56 4,589ms 4 Nov 2025 570th nwellnhof 🇩🇪 827 102 398ms 21 Nov 2021 571st leon-w 826 58 12ms 23 Jun 2019 571st toombs-caeman 826 58 12ms 11 Mar 2020 571st shraiwi 826 58 12ms 30 Apr 2020 571st dzshn 826 58 12ms 18 Aug 2021 571st cbrt-x 826 58 12ms 26 Sep 2021 571st Indivicivet 826 58 11ms 17 Oct 2021 571st thatbirdguythatuknownot 826 58 11ms 30 Jan 2023 571st janbehrens 🇩🇪 826 58 11ms 17 Jun 2023 571st ListeriaM 826 58 11ms 19 Aug 2023 571st yuchuehw 826 58 24ms 18 Jan 2024 571st MaxElf999 826 58 9ms 8 Feb 2024 571st dokutan 826 58 23ms 2 Mar 2024 571st Herbert00709 🇵🇱 826 58 20ms 6 May 2024 571st alemelis 826 58 11ms 13 Sep 2024 571st snydej 826 58 9ms 21 Nov 2024 571st JunkIce 826 58 26ms 13 Mar 2025 571st redweasel 826 58 225ms 24 Jul 2025 571st YAJUE114514 826 58 10ms 11 days ago 571st yujqiao 826 58 13ms 6 days ago 590th DialFrost 🇸🇬 825 64 976ms 23 Aug 2024 591st stefangimmillaro 823 41 55ms 26 Dec 2024 592nd msbranicky 823 109 324ms 31 Aug 2023 593rd Yewzir 🇧🇪 822 54 394ms 15 Jan 2024 594th GrayJoKing 🇦🇺 822 123 19ms 4 Feb 2024 595th itiievskyi 🇺🇦 820 40 344ms 20 Aug 2020 595th FlorianCassayre 🇫🇷 820 40 2,338ms 26 May 2024 597th MeWhenI 🇻🇦 819 50 70ms 1 Nov 2023 597th DialFrost 🇸🇬 819 50 64ms 9 Apr 2025 599th CatsAreFluffy 818 61 10ms 19 Feb 2023 599th lyphyser 818 61 9ms 3 Jun 2023 601st edsrzf 🇳🇿 816 94 195ms 9 Jun 2025 602nd WildTooth 813 57 4,092ms 10 Oct 2025 603rd diddily 812 29 34ms 29 Oct 2019 603rd yzhs 🇩🇪 812 29 33ms 3 Mar 2020 603rd lynn 812 29 34ms 13 Apr 2021 603rd JayXon 🇺🇸 812 29 35ms 29 Jul 2021 603rd rak1507 🇬🇧 812 29 46ms 26 Oct 2021 603rd j-Ewan 812 29 49ms 17 Mar 2022 603rd stackofbears 812 29 33ms 17 Dec 2023 603rd SirBogman 🇺🇸 812 29 36ms 5 Jun 2025 611th Steffan153 🇫🇮 812 55 2,375ms 27 Oct 2023 612th guliyevemil1 🇦🇿 812 59 12ms 16 Apr 2020 612th milotoor 812 59 13ms 18 Apr 2020 612th RYNO8 812 59 13ms 7 Aug 2021 612th tpasfieldERAU 812 59 12ms 14 Nov 2022 612th KatieLG 🇬🇧 812 59 14ms 11 Dec 2022 612th yishayv 812 59 10ms 23 Jan 2023 612th crispshaker 812 59 23ms 18 Mar 2023 612th falsidge 812 59 9ms 5 Jul 2023 612th cingulataluke 812 59 13ms 26 Aug 2023 612th bac0id 812 59 11ms 26 Sep 2023 612th gussy420 812 59 9ms 23 Oct 2023 612th keelimeguy 🇺🇸 812 59 12ms 6 Nov 2023 612th enbyte 812 59 12ms 9 Dec 2023 612th zwxzwxzwx21 812 59 12ms 30 Jan 2024 612th vgamula 🇺🇦 812 59 13ms 18 May 2024 612th wuzekai518 812 59 22ms 21 Jun 2024 612th LHLaurini 🇧🇷 812 59 12ms 5 Jul 2024 612th mohammad-sayed-ahmad 812 59 11ms 21 Jul 2024 612th HumanoidCPU 812 59 13ms 29 Aug 2024 612th addmai 812 59 12ms 26 Jul 2025 632nd inventshah 812 65 976ms 27 Sep 2023 633rd Yax42 🇫🇷 811 104 455ms 25 Dec 2024 633rd AdrienHache 🇫🇷 811 104 473ms 12 Aug 2025 635th flawr 806 73 112ms 19 Jul 2019 635th annaproxy 806 73 124ms 18 Aug 2022 637th didion0 🇺🇸 804 62 28ms 11 Feb 2022 638th Shanethegamer 🇺🇸 803 42 35ms 28 Jan 2022 638th Natanaelel 🇸🇪 803 42 36ms 28 Dec 2022 638th 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