The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
τ 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 Herbert00709 🇵🇱 689 39 58ms 5 May 2024 562nd NewDefectus 🇮🇱 689 82 30ms 12 Oct 2020 562nd wen1now 689 82 11ms 7 Nov 2023 562nd ei14 689 82 30ms 23 May 2024 565th Yax42 🇫🇷 689 142 397ms 25 Dec 2024 566th Alex-x90 🇺🇸 687 146 10ms 10 Aug 2023 566th madex 🇩🇪 687 146 6ms 28 Oct 2024 568th 52525rr 685 87 10ms 12 Jun 2025 568th JOrE20 🇺🇸 685 87 15ms 27 days ago 570th clockworknazo 683 98 410ms 23 Oct 2022 571st lynn 680 74 1,341ms 19 Nov 2021 572nd tfkls 678 56 197ms 16 Oct 2020 572nd latvianfarmer17 🇱🇻 678 56 205ms 20 Jul 2023 572nd davbass 🇮🇹 678 56 237ms 25 Aug 2023 575th primo-ppcg 🇹🇭 676 176 547ms 13 Jul 2020 575th Lydxn 🇨🇦 676 176 514ms 28 Dec 2021 575th duckyluuk 🇳🇱 676 176 431ms 25 Sep 2025 578th stefangimmillaro 675 212 266ms 13 Dec 2024 579th SirBogman 🇺🇸 674 86 846ms 21 Feb 2024 580th Alex-x90 🇺🇸 674 175 65ms 21 Oct 2022 581st Shanethegamer 🇺🇸 673 60 55ms 2 Jun 2022 582nd Mandrzejy 🇵🇱 673 149 6ms 14 Apr 2024 582nd marshallward 🇺🇸 673 149 52ms 6 May 2025 584th MeWhenI 🇻🇦 673 196 3ms 12 Aug 2024 585th yokasuretsu 672 84 12ms 14 Apr 2018 586th dokutan 670 197 3ms 12 Aug 2024 587th xyangst 669 89 10ms 12 Oct 2024 587th gigaprofisi 🇺🇸 669 89 78ms 25 Jul 2025 589th primo-ppcg 🇹🇭 668 52 18ms 29 Nov 2020 590th ovs-code 🇩🇪 668 118 2,681ms 16 Aug 2023 591st emgordon154 667 93 1,101ms 17 Nov 2024 592nd Indivicivet 666 57 198ms 30 Mar 2021 593rd tomh1012 666 147 379ms 11 Sep 2025 594th HETHAT 🇩🇿 665 85 18ms 3 Aug 2025 595th primo-ppcg 🇹🇭 665 197 2,136ms 3 Feb 2022 596th jmerle 🇳🇱 662 61 61ms 13 Jul 2023 597th targrik 661 111 3,591ms 4 Jan 2025 598th SirBogman 🇺🇸 660 152 42ms 3 Jun 2025 599th trinityy-7 656 53 38ms 16 Feb 2024 600th MeWhenI 🇻🇦 655 200 3,055ms 3 Sep 2023 601st anter69 🇭🇺 653 95 960ms 22 Feb 2023 602nd CaedenHarper 🇨🇦 653 182 656ms 30 Oct 2025 603rd janbehrens 🇩🇪 652 181 418ms 15 May 2023 604th prestosilver 🇺🇸 651 154 21ms 22 days ago 605th MeWhenI 🇻🇦 650 183 501ms 7 Nov 2025 606th yzhs 🇩🇪 649 87 27ms 25 Oct 2020 607th MeWhenI 🇻🇦 648 83 146ms 3 Aug 2024 608th pardouin 🇫🇷 647 73 759ms 24 days ago 609th XenThe 🇬🇧 647 92 11ms 1 Jul 2025 610th MeWhenI 🇻🇦 647 183 51ms 17 Feb 2023 611th AlephSquirrel 645 206 132ms 3 Aug 2023 612th itiievskyi 🇺🇦 643 59 200ms 21 Aug 2020 612th heanyang1 643 59 221ms 29 May 2025 614th inventshah 643 156 4ms 28 Apr 2023 615th stefangimmillaro 643 185 461ms 6 Oct 2025 616th RYNO8 642 88 1,992ms 27 Aug 2021 617th Natanaelel 🇸🇪 641 63 41ms 21 Apr 2025 618th olivermrose 🇺🇸 640 93 11ms 6 Oct 2021 619th MeWhenI 🇻🇦 639 76 706ms 1 Nov 2023 620th jared-hughes 639 186 457ms 24 Sep 2025 621st CaedenHarper 🇨🇦 639 224 276ms 1 Nov 2025 622nd MeWhenI 🇻🇦 638 185 66ms 21 May 2023 623rd albanian-laundromat 638 192 467ms 18 Oct 2025 624th MeWhenI 🇻🇦 637 105 4,072ms 28 Jun 2023 625th namelessiw 636 187 491ms 15 Nov 2025 626th MeWhenI 🇻🇦 635 79 275ms 28 Jan 2023 627th glesnick 635 89 34ms 18 Aug 2022 628th janbehrens 🇩🇪 635 158 7ms 15 May 2023 629th stefangimmillaro 635 218 132ms 6 Nov 2023 630th emgordon154 634 110 3,624ms 12 Jul 2025 631st emgordon154 632 194 751ms 1 Jun 2025 632nd cure-honey 🇯🇵 632 276 67ms 8 Jul 2021 633rd SirBogman 🇺🇸 632 374 216ms 12 Jul 2023 634th DialFrost 🇸🇬 631 64 52ms 1 Jun 2024 634th dokutan 631 64 52ms 21 Apr 2025 636th Shanethegamer 🇺🇸 630 91 101ms 2 Jun 2022 637th daedals 628 90 15ms 6 Jun 2019 637th knutae 🇳🇴 628 90 14ms 14 Jul 2021 637th DrPiranoid 628 90 14ms 26 Mar 2023 637th fourth-bit 628 90 15ms 23 Jun 2023 First Prev 561–640 of 2,240 Next Last