The Calendar hole will go live in approximately 8 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 801st mousetail 🇳🇱 470 74 546ms 14 Mar 2025 802nd h3ra993huskp 🇯🇵 470 253 482ms 23 days ago 803rd PatrickStephansen 🇿🇦 462 129 302ms 23 Apr 2021 803rd Ultra814 462 129 22ms 25 Aug 2025 805th heanyang1 460 218 37ms 14 Mar 2025 806th adamnielson42 🇺🇸 459 123 43ms 31 Mar 2023 806th driri85 459 123 30ms 7 Jan 2025 808th Mr-McChicken 456 124 21ms 16 Oct 2023 809th janbehrens 🇩🇪 453 162 3,697ms 22 Jun 2023 810th Yewzir 🇧🇪 452 222 2ms 23 Dec 2023 811th yzhs 🇩🇪 449 145 2,527ms 27 Jul 2021 812th fynnkroeger 448 126 429ms 22 Jan 2021 812th ydevor 🇮🇱 448 126 2,604ms 14 Mar 2021 812th CutSandstone 448 126 484ms 7 Jul 2024 812th RandGuy 448 126 18ms 25 days ago 816th stefangimmillaro 447 156 3,492ms 8 Dec 2024 817th tigerdan2 🇩🇪 447 266 1,189ms 23 days ago 818th Secozzi 445 127 9ms 20 Oct 2020 818th InigoK 🇺🇸 445 127 2,544ms 13 Jun 2023 818th CommandLeo 🇮🇹 445 127 634ms 9 Oct 2025 821st dokutan 442 227 2ms 1 May 2024 822nd Andrey135296 441 128 44ms 30 Apr 2022 822nd davidsaltacc 441 128 14ms 16 Nov 2023 824th dokutan 441 212 92ms 10 days ago 825th iznax 439 223 387ms 21 Nov 2021 826th marcin7Cd 438 112 42ms 4 Feb 2021 827th MeWhenI 🇻🇦 437 399 29ms 10 Jul 2021 828th MeWhenI 🇻🇦 434 169 149ms 16 Apr 2024 829th piano-miles 432 138 3,761ms 19 Feb 2023 830th Indivicivet 431 131 207ms 24 Oct 2021 831st AkashTandon167 429 234 3ms 6 Nov 2019 832nd boxjelly 429 277 423ms 2 Mar 2021 833rd albanian-laundromat 426 278 583ms 22 Aug 2025 834th lukechampine 426 336 275ms 16 Apr 2020 835th amollberg 🇸🇪 425 133 850ms 28 Jan 2022 835th hellwue 425 133 24ms 17 Feb 2023 837th BrenSchaap 423 96 53ms 12 Nov 2021 838th MeWhenI 🇻🇦 422 112 827ms 15 Sep 2025 839th aksyristos 422 134 213ms 30 Oct 2022 839th hiichbindermax 422 134 15ms 14 Feb 2025 841st lifthrasiir 🇰🇷 420 595 7ms 11 Dec 2024 842nd relet 418 135 15ms 9 Aug 2018 842nd jmhowl 418 135 62ms 3 Jun 2020 842nd cooljoseph1 418 135 16ms 24 Dec 2023 842nd BenjaminHGong 418 135 69ms 23 May 2025 846th Yewzir 🇧🇪 416 362 2,326ms 14 Nov 2025 847th chneau 415 136 143ms 25 Apr 2020 847th ehulinsky 🇺🇸 415 136 15ms 10 Nov 2021 847th eiburns 415 136 38ms 26 Sep 2023 850th GolfingSuccess 🇬🇷 415 816 609ms 10 Aug 2022 851st robin-scragg 412 137 14ms 17 Oct 2025 852nd Shanethegamer 🇺🇸 409 120 98ms 2 Jun 2022 853rd dzhang314 409 138 17ms 14 Aug 2019 853rd jfallon1997 409 138 16ms 14 May 2024 855th snoozingnewt 🇨🇦 408 193 273ms 22 Nov 2025 856th jameslindesay 406 139 292ms 25 Feb 2021 856th stordev 406 139 38ms 26 Feb 2021 858th Yewzir 🇧🇪 404 242 398ms 11 Feb 2024 859th cbondurant 403 140 16ms 7 May 2021 859th thehylian 403 140 23ms 17 Sep 2023 861st klixel 🇨🇦 401 141 32ms 17 Oct 2024 861st Code-Coder-coder 401 141 140ms 13 Oct 2025 863rd orthoplex 🇨🇽 399 237 4ms 28 Sep 2020 864th kenny14231 398 142 1,325ms 5 Aug 2022 864th dirckvdende 398 142 16ms 2 Aug 2025 866th adamnielson42 🇺🇸 397 150 17ms 24 Apr 2023 867th dokutan 396 247 375ms 21 Aug 2024 868th lahell 395 127 276ms 23 Jul 2020 869th sleepyStick 395 143 16ms 7 Dec 2021 869th asadullayev 395 143 36ms 8 Jul 2022 869th suwat513 395 143 37ms 16 Jun 2023 872nd retrohun 395 857 31ms 3 Jan 2023 873rd MeWhenI 🇻🇦 393 98 441ms 2 Jan 2022 874th mueller14003 392 144 25ms 19 Apr 2018 874th Starwort 🇬🇧 392 144 15ms 28 May 2019 874th dzshn 392 144 30ms 18 Aug 2021 874th smokestacklightnin 🇺🇸 392 144 26ms 23 Feb 2024 878th ly0va 390 145 15ms 3 Jan 2019 878th michelebastione 🇮🇹 390 145 28ms 7 Jul 2019 878th rollershutter 390 145 35ms 26 Sep 2025 First Prev 801–880 of 2,256 Next Last
