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 879th DialFrost 🇸🇬 703 48 74ms 27 Dec 2024 882nd Schmitt-Very-Cool 703 87 459ms 3 Oct 2025 883rd SirFireball3521 702 40 145ms 1 Mar 2023 884th TheRealOhead 🇺🇸 702 71 26ms 31 Mar 2023 884th Protothor 702 71 20ms 9 Jul 2025 884th iczelia 🇩🇪 702 71 20ms 10 Oct 2025 887th LHLaurini 🇧🇷 700 84 119ms 5 Jul 2024 888th ovs-code 🇩🇪 697 104 99ms 13 Oct 2022 888th MeWhenI 🇻🇦 697 104 161ms 14 Oct 2022 890th emgordon154 696 123 100ms 13 days ago 891st jmhowl 694 69 11ms 19 Jan 2020 891st cmdrsabre 694 69 11ms 30 Jan 2020 891st artyom-razinov 694 69 12ms 13 Feb 2020 891st HemangRajvanshy 694 69 12ms 1 Apr 2020 891st msrawson 694 69 12ms 14 May 2020 891st PyPylia 🇦🇺 694 69 11ms 7 Aug 2020 891st billylanchantin 694 69 12ms 23 Aug 2020 891st magnickolas 694 69 13ms 29 Aug 2020 891st WillowBee7 694 69 11ms 28 Sep 2020 891st ralsei 694 69 11ms 6 Oct 2020 891st jdrouvin 694 69 12ms 2 Dec 2020 891st befoster 694 69 9ms 10 Apr 2021 891st StHagel 694 69 12ms 7 May 2021 891st 8Bit1Byte 694 69 12ms 20 Jun 2021 891st Fmbalbuena 694 69 12ms 17 Sep 2021 891st Ted-Barrett 🇦🇺 694 69 11ms 29 Sep 2021 891st forlack 694 69 11ms 8 Nov 2021 891st shibacho 🇯🇵 694 69 12ms 27 Nov 2021 891st pecholsjones 694 69 12ms 12 Dec 2021 891st CuboidRaptor 🇨🇦 694 69 12ms 3 Apr 2022 891st MakkCH 694 69 11ms 24 Apr 2022 891st bonevbs 694 69 12ms 20 Nov 2022 891st KevinLyvers 694 69 12ms 13 Dec 2022 891st jtaxen 694 69 12ms 4 Jan 2023 891st SucukMitEi 694 69 12ms 7 Jan 2023 891st atazzam 🇺🇸 694 69 12ms 5 Mar 2023 891st DrPiranoid 694 69 12ms 26 Mar 2023 891st Hortaros 694 69 11ms 15 Apr 2023 891st XioR112 🇵🇱 694 69 13ms 29 Aug 2023 891st jameswmccarty 694 69 12ms 6 Jun 2024 891st dtbao20 🇻🇳 694 69 12ms 8 Oct 2024 891st sciencedjinn 694 69 12ms 8 Nov 2024 891st Unknownuserfrommars 694 69 13ms 21 Nov 2024 891st yokasuretsu 694 69 9ms 31 Dec 2024 891st clayboll99 694 69 12ms 10 Jul 2025 926th janbehrens 🇩🇪 693 72 41ms 30 Dec 2023 926th emgordon154 693 72 78ms 4 Aug 2024 928th SmartK8 🇨🇿 691 122 421ms 1 Nov 2022 928th tomh1012 691 122 414ms 8 Sep 2025 930th MeWhenI 🇻🇦 690 29 742ms 25 Jul 2022 930th lifthrasiir 🇰🇷 690 29 82ms 5 Dec 2024 932nd annaproxy 689 49 72ms 27 Aug 2022 932nd croc54 689 49 40ms 10 Dec 2024 934th RustemB 🇷🇺 685 41 143ms 26 Feb 2020 935th petar-donchev 685 70 46ms 1 Sep 2019 935th cubed-guy 685 70 53ms 20 Sep 2021 935th kenny14231 685 70 11ms 9 Oct 2021 935th GioacchinoGT02 685 70 12ms 3 Dec 2024 939th yzhs 🇩🇪 684 86 114ms 24 Jul 2021 939th strout 684 86 106ms 26 Aug 2022 941st MeWhenI 🇻🇦 684 232 41ms 6 Jun 2023 942nd m-tkach 🇺🇦 684 259 60ms 27 Jun 2022 943rd aliakseikalosha 680 124 480ms 17 Oct 2024 943rd Soyo-Wind 680 124 435ms 6 Nov 2025 945th juliansiebert 🇩🇪 679 68 271ms 3 Aug 2022 946th duckyluuk 🇳🇱 679 90 493ms 25 Sep 2025 947th primo-ppcg 🇹🇭 676 196 2,158ms 3 Feb 2022 948th teddyward 675 71 12ms 9 Jan 2021 948th xkacer 🇨🇿 675 71 12ms 25 Jan 2021 948th sadfun 675 71 12ms 29 Jan 2021 948th ArmaanAS 675 71 9ms 24 Mar 2021 948th classAndrew 675 71 12ms 1 Aug 2021 948th SpareManiKatti 675 71 9ms 10 Sep 2021 948th JGDoerrer 675 71 11ms 22 Jan 2022 948th lovernj 675 71 12ms 7 Feb 2022 948th elephantpanda 675 71 9ms 31 Aug 2022 948th sandorstormen 675 71 12ms 25 Nov 2022 948th Vinterion 675 71 11ms 24 Jul 2023 948th sulphemi 675 71 12ms 5 Oct 2023 948th dal548 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