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 721st SirBogman 🇺🇸 747 138 81ms 28 May 2023 722nd dokutan 746 44 2,543ms 26 Mar 2023 723rd SirBogman 🇺🇸 746 113 436ms 9 Jan 2024 724th sean-niemann 🇺🇸 745 161 46ms 7 Aug 2023 725th m-tkach 🇺🇦 745 213 49ms 31 Jan 2024 726th prplz 🇦🇺 744 62 571ms 12 Jun 2020 727th emgordon154 743 61 7ms 10 Dec 2024 728th GrayJoKing 🇦🇺 742 57 13ms 17 Dec 2020 729th AlephSquirrel 741 27 360ms 24 Jul 2022 729th saito-ta 🇯🇵 741 27 120ms 26 Jul 2022 729th GrayJoKing 🇦🇺 741 27 41ms 25 Aug 2022 729th ovs-code 🇩🇪 741 27 138ms 26 Jun 2024 733rd HPWiz 🇳🇿 740 69 3,989ms 18 Jan 2025 734th CaedenHarper 🇨🇦 740 114 397ms 19 Oct 2025 735th acotis 740 182 157ms 28 Jun 2025 736th michelebastione 🇮🇹 737 65 23ms 30 Jun 2019 736th trillllian 737 65 23ms 6 Sep 2020 736th munchkinduncan 737 65 23ms 17 Jan 2021 736th OllieBoyne 🇬🇧 737 65 23ms 2 Jun 2021 736th Manby 737 65 70ms 7 Jul 2021 736th cbondurant 737 65 12ms 6 Jul 2022 736th andre-de-lorde 737 65 24ms 9 Sep 2022 736th 5space 737 65 164ms 11 Sep 2022 736th trinityy-7 737 65 23ms 13 Sep 2023 736th xyangst 737 65 23ms 1 Oct 2024 736th Flekay 🇩🇪 737 65 24ms 10 Jul 2025 736th RaBa21 🇭🇺 737 65 26ms 18 Jul 2025 736th ahmetdemirag 🇨🇾 737 65 23ms 30 Jul 2025 749th dokutan 736 63 3,571ms 24 Oct 2024 749th snoozingnewt 🇨🇦 736 63 3,293ms 10 Oct 2025 751st cywong-amino 🇭🇰 733 68 22ms 2 Jul 2020 751st tayloia 🇬🇧 733 68 24ms 15 May 2023 753rd annaproxy 733 115 377ms 27 Oct 2023 754th Herbert00709 🇵🇱 731 141 83ms 25 Oct 2024 755th stefangimmillaro 727 116 430ms 18 Jul 2023 756th dokutan 727 222 1ms 3 Apr 2024 757th kohlrabi 726 66 12ms 5 Feb 2020 757th stordev 726 66 69ms 26 Feb 2021 757th lmolteno 726 66 23ms 9 Mar 2021 757th dillon-duncando 726 66 23ms 6 Dec 2021 757th NDR0216 🇹🇼 726 66 23ms 13 Feb 2023 757th quimey 726 66 11ms 6 Mar 2023 757th roupiq 🇵🇱 726 66 37ms 21 Feb 2024 757th wh3n3v3r 🇨🇿 726 66 15ms 8 Nov 2024 757th ImpressedByRocks 726 66 10ms 24 May 2025 766th Irratix 🇳🇱 726 81 125ms 1 Oct 2021 767th jared-hughes 726 142 87ms 7 Feb 2023 768th Herbert00709 🇵🇱 724 64 3,487ms 29 Oct 2024 769th MeWhenI 🇻🇦 724 103 524ms 28 Feb 2022 770th rucin93 🇵🇱 724 135 360ms 14 Nov 2025 771st MeWhenI 🇻🇦 723 69 23ms 3 Aug 2024 772nd primo-ppcg 🇹🇭 723 73 993ms 25 Nov 2021 772nd anter69 🇭🇺 723 73 934ms 19 Apr 2024 774th LS2021 721 117 415ms 24 Nov 2023 775th emgordon154 721 166 478ms 30 Apr 2025 776th primo-ppcg 🇹🇭 720 62 3,555ms 30 Jan 2022 777th WildTooth 719 85 707ms 10 Oct 2025 778th dokutan 719 286 2ms 7 Nov 2025 779th roguh 🇬🇹 717 59 5ms 26 Jan 2024 780th CatsAreFluffy 717 82 117ms 7 Dec 2022 781st urojony 🇵🇱 715 67 24ms 3 Jan 2021 781st tetraxile 715 67 24ms 3 Oct 2021 781st Nibamot 715 67 12ms 10 Dec 2021 781st CheeseCake628 🇳🇴 715 67 87ms 9 Feb 2023 781st GeorgeStechman 🇬🇧 715 67 46ms 6 Jan 2024 781st RandGuy 715 67 23ms 25 Jan 2024 781st Ralac07 🇦🇺 715 67 23ms 16 Feb 2024 781st inverseLorentz 🇦🇺 715 67 85ms 10 Apr 2024 781st driri85 715 67 12ms 7 Jan 2025 781st solisolu 715 67 50ms 9 Nov 2025 791st MeWhenI 🇻🇦 715 118 417ms 8 Dec 2022 792nd Natanaelel 🇸🇪 714 28 42ms 16 May 2025 792nd emgordon154 714 28 46ms 30 Jun 2025 794th masflam 713 46 321ms 21 Jun 2024 795th dmrichwa 🇺🇸 712 70 23ms 19 Mar 2022 795th Naruyoko 712 70 71ms 13 Aug 2023 797th Yewzir 🇧🇪 711 145 951ms 14 May 2024 798th lynn 709 63 13ms 15 Nov 2021 799th stefangimmillaro 708 190 127ms 4 Jun 2025 800th markus-rekdal 705 68 23ms 31 May 2019 First Prev 721–800 of 2,801 Next Last