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 800th InigoK 🇺🇸 445 127 2,544ms 13 Jun 2023 800th CommandLeo 🇮🇹 445 127 634ms 9 Oct 2025 803rd dokutan 442 227 2ms 1 May 2024 804th Andrey135296 441 128 44ms 30 Apr 2022 804th davidsaltacc 441 128 14ms 16 Nov 2023 806th dokutan 441 212 92ms 12 days ago 807th iznax 439 223 387ms 21 Nov 2021 808th marcin7Cd 438 112 42ms 4 Feb 2021 809th MeWhenI 🇻🇦 437 399 29ms 10 Jul 2021 810th frosster 436 258 2ms 13 Mar 2025 811th MeWhenI 🇻🇦 434 169 149ms 16 Apr 2024 812th piano-miles 432 138 3,761ms 19 Feb 2023 813th Indivicivet 431 131 207ms 24 Oct 2021 814th AkashTandon167 429 234 3ms 6 Nov 2019 815th boxjelly 429 277 423ms 2 Mar 2021 816th albanian-laundromat 426 278 583ms 22 Aug 2025 817th lukechampine 426 336 275ms 16 Apr 2020 818th amollberg 🇸🇪 425 133 850ms 28 Jan 2022 818th hellwue 425 133 24ms 17 Feb 2023 820th MeWhenI 🇻🇦 422 112 827ms 15 Sep 2025 821st aksyristos 422 134 213ms 30 Oct 2022 821st hiichbindermax 422 134 15ms 14 Feb 2025 823rd BrenSchaap 421 96 60ms 12 Nov 2021 824th lifthrasiir 🇰🇷 420 595 7ms 11 Dec 2024 825th relet 418 135 15ms 9 Aug 2018 825th jmhowl 418 135 62ms 3 Jun 2020 825th cooljoseph1 418 135 16ms 24 Dec 2023 825th BenjaminHGong 418 135 69ms 23 May 2025 829th Yewzir 🇧🇪 416 362 2,326ms 14 Nov 2025 830th chneau 415 136 143ms 25 Apr 2020 830th ehulinsky 🇺🇸 415 136 15ms 10 Nov 2021 830th eiburns 415 136 38ms 26 Sep 2023 833rd GolfingSuccess 🇬🇷 415 816 609ms 10 Aug 2022 834th robin-scragg 412 137 14ms 17 Oct 2025 835th Shanethegamer 🇺🇸 409 120 98ms 2 Jun 2022 836th dzhang314 409 138 17ms 14 Aug 2019 836th jfallon1997 409 138 16ms 14 May 2024 838th jacobly0 🇺🇸 409 275 2ms 21 Sep 2023 839th snoozingnewt 🇨🇦 408 193 273ms 22 Nov 2025 840th jameslindesay 406 139 292ms 25 Feb 2021 840th stordev 406 139 38ms 26 Feb 2021 842nd Yewzir 🇧🇪 404 242 398ms 11 Feb 2024 843rd cbondurant 403 140 16ms 7 May 2021 843rd thehylian 403 140 23ms 17 Sep 2023 845th klixel 🇨🇦 401 141 32ms 17 Oct 2024 845th Code-Coder-coder 401 141 140ms 13 Oct 2025 847th orthoplex 🇨🇽 399 237 4ms 28 Sep 2020 848th kenny14231 398 142 1,325ms 5 Aug 2022 848th dirckvdende 398 142 16ms 2 Aug 2025 850th adamnielson42 🇺🇸 397 150 17ms 24 Apr 2023 851st dokutan 396 247 375ms 21 Aug 2024 852nd lahell 395 127 260ms 23 Jul 2020 853rd sleepyStick 395 143 16ms 7 Dec 2021 853rd asadullayev 395 143 36ms 8 Jul 2022 853rd suwat513 395 143 37ms 16 Jun 2023 856th retrohun 395 857 31ms 3 Jan 2023 857th MeWhenI 🇻🇦 393 98 344ms 2 Jan 2022 858th mueller14003 392 144 25ms 19 Apr 2018 858th Starwort 🇬🇧 392 144 15ms 28 May 2019 858th dzshn 392 144 30ms 18 Aug 2021 858th smokestacklightnin 🇺🇸 392 144 26ms 23 Feb 2024 862nd ly0va 390 145 15ms 3 Jan 2019 862nd michelebastione 🇮🇹 390 145 28ms 7 Jul 2019 862nd rollershutter 390 145 35ms 26 Sep 2025 865th elgan65536 390 305 2,646ms 17 Apr 2024 866th zakariamouhid 389 153 15ms 18 May 2023 867th guliyevemil1 🇦🇿 387 146 15ms 17 Apr 2020 867th magnickolas 387 146 22ms 19 Nov 2020 867th m42km 387 146 10ms 10 Oct 2023 870th inventshah 387 307 483ms 20 Apr 2021 871st NickTheEASDude 🇺🇸 386 90 3,588ms 26 Apr 2024 872nd doge1338 385 372 293ms 20 Mar 2021 873rd MaxElf999 384 147 17ms 27 Sep 2022 874th jakobkordez 🇸🇮 382 148 52ms 23 Oct 2022 874th cthierfelder 🇲🇨 382 148 163ms 4 Sep 2025 876th Mabeloid 🇳🇴 379 149 24ms 7 Sep 2024 876th blaztoma 🇱🇹 379 149 28ms 4 Oct 2025 878th bkshrader 377 150 315ms 30 Dec 2018 879th edre 377 158 60ms 6 May 2018 880th MeWhenI 🇻🇦 376 901 4ms 3 hours ago First Prev 801–880 of 2,241 Next Last