The Calendar hole will go live in approximately 6 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 641st j-Ewan 801 112 299ms 15 Mar 2022 642nd sean-niemann 🇺🇸 801 168 136ms 8 Jun 2025 643rd primo-ppcg 🇹🇭 800 25 318ms 30 Sep 2022 643rd fuzzylojik-golf 🇺🇸 800 25 315ms 14 Sep 2025 645th lynn 800 41 241ms 7 Mar 2021 646th Shanethegamer 🇺🇸 799 42 39ms 28 Jan 2022 646th Natanaelel 🇸🇪 799 42 36ms 28 Dec 2022 646th emgordon154 799 42 35ms 19 Jan 2025 649th thisishowmymindworks 🇳🇴 799 60 46ms 14 Oct 2020 649th SomeKitten 🇺🇸 799 60 12ms 21 Aug 2022 649th CarsonChr 🇺🇸 799 60 12ms 18 Sep 2022 649th glassala 799 60 11ms 25 Dec 2024 649th webmiche 799 60 13ms 3 Nov 2025 654th DialFrost 🇸🇬 798 39 992ms 2 Sep 2025 655th Sp3000 🇦🇺 797 34 12ms 28 May 2021 656th Jeremy-Stafford 795 74 144ms 28 Feb 2023 657th jerrandolph 794 113 296ms 22 Oct 2023 658th m-tkach 🇺🇦 794 259 2ms 14 Jun 2022 658th UnderKoen 🇳🇱 794 259 2ms 22 Feb 2024 660th AlephSquirrel 792 63 11ms 15 Nov 2021 660th gigaprofisi 🇺🇸 792 63 9ms 1 Sep 2025 660th Yax42 🇫🇷 792 63 9ms 5 Sep 2025 663rd lifthrasiir 🇰🇷 791 316 3,930ms 15 Dec 2024 664th Herbert00709 🇵🇱 790 128 12ms 8 Jun 2024 665th chunes3 🇺🇸 788 52 68ms 19 Sep 2023 666th Waffle3z 786 61 180ms 24 Jul 2021 666th tomtheisen 🇺🇸 786 61 15ms 29 Jan 2023 666th fgrosshans 🇫🇷 786 61 20ms 3 May 2023 666th davidsaltacc 786 61 12ms 16 Nov 2023 670th jared-hughes 785 30 34ms 20 Oct 2021 670th ZakkkkAttackkkk 🇵🇭 785 30 46ms 26 Dec 2021 672nd Steffan153 🇫🇮 784 54 5ms 29 Aug 2024 672nd AlephSquirrel 784 54 5ms 3 Oct 2024 674th MeWhenI 🇻🇦 782 59 337ms 14 Jul 2024 675th Mukundan314 781 43 35ms 16 Apr 2025 675th csharpython 781 43 33ms 24 Aug 2025 677th billings7 🇬🇧 781 108 360ms 21 Nov 2021 677th DialFrost 🇸🇬 781 108 554ms 22 Jul 2025 679th DialFrost 🇸🇬 780 93 132ms 23 Mar 2025 680th DialFrost 🇸🇬 780 160 1,667ms 15 Sep 2025 681st 52525rr 779 64 9ms 12 Jun 2025 681st Lv0Sys 🇵🇱 779 64 19ms 22 days ago 683rd SirBogman 🇺🇸 779 78 1,258ms 4 Jan 2022 684th fuzzylojik-golf 🇺🇸 778 40 956ms 14 Sep 2025 684th snoozingnewt 🇨🇦 778 40 762ms 22 Oct 2025 686th primo-ppcg 🇹🇭 775 133 60ms 14 days ago 687th namelessiw 774 109 388ms 30 Jul 2024 688th yzhs 🇩🇪 773 62 13ms 25 Oct 2020 688th lilyyy411 773 62 24ms 10 Sep 2021 688th glesnick 773 62 22ms 18 Aug 2022 688th Anthony-Williams-06 773 62 24ms 28 Nov 2022 688th willdaspit 773 62 12ms 4 Aug 2023 693rd jacobly0 🇺🇸 771 162 1,686ms 18 Sep 2025 694th varhammer 🇷🇺 769 55 5ms 20 Aug 2021 694th fuzzylojik-golf 🇺🇸 769 55 6ms 12 Aug 2025 696th PatrickStephansen 🇿🇦 767 65 37ms 5 Mar 2021 697th mpldr 🇩🇪 767 117 365ms 26 Nov 2023 698th dokutan 766 58 433ms 2 Mar 2024 698th Herbert00709 🇵🇱 766 58 390ms 13 May 2024 698th JunkIce 766 58 375ms 13 Mar 2025 701st anter69 🇭🇺 763 44 37ms 15 days ago 702nd KasperKivimaeki 🇫🇮 763 135 408ms 20 Nov 2025 702nd sean-niemann 🇺🇸 763 135 78ms 2 days ago 704th Secozzi 761 63 12ms 4 Nov 2020 704th georgehulme 761 63 12ms 28 Jan 2022 704th cyxv 761 63 14ms 30 Jun 2022 704th ei14 761 63 69ms 7 May 2024 704th LostSyntax21 🇬🇧 761 63 12ms 25 Sep 2024 704th DraigRygbi 761 63 11ms 19 Dec 2024 704th Pyroan 761 63 12ms 10 Mar 2025 711th jared-hughes 757 119 3,051ms 7 Feb 2023 712th SirBogman 🇺🇸 756 61 280ms 9 Jun 2020 713th namelessiw 753 59 416ms 5 Mar 2024 713th HumanoidCPU 753 59 339ms 29 Aug 2024 713th KatieLG 🇬🇧 753 59 400ms 28 Oct 2024 716th primo-ppcg 🇹🇭 752 36 48ms 6 Dec 2020 717th ovs-code 🇩🇪 751 105 2,330ms 6 days ago 718th ordinary-slim 749 64 12ms 20 Nov 2022 719th bendapootie 748 120 316ms 18 Jul 2020 719th cure-honey 🇯🇵 748 120 341ms 23 Jun 2021 First Prev 641–720 of 2,782 Next Last