The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
τ in Python 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 159th eiburns 426 136 38ms 26 Sep 2023 162nd robin-scragg 423 137 14ms 17 Oct 2025 163rd dzhang314 420 138 17ms 14 Aug 2019 163rd jfallon1997 420 138 16ms 14 May 2024 165th jameslindesay 417 139 292ms 25 Feb 2021 165th stordev 417 139 38ms 26 Feb 2021 167th cbondurant 414 140 16ms 7 May 2021 167th thehylian 414 140 23ms 17 Sep 2023 169th klixel 🇨🇦 411 141 32ms 17 Oct 2024 169th Code-Coder-coder 411 141 140ms 13 Oct 2025 171st kenny14231 408 142 1,325ms 5 Aug 2022 171st dirckvdende 408 142 16ms 2 Aug 2025 173rd sleepyStick 406 143 16ms 7 Dec 2021 173rd asadullayev 406 143 36ms 8 Jul 2022 173rd suwat513 406 143 37ms 16 Jun 2023 176th mueller14003 403 144 25ms 19 Apr 2018 176th Starwort 🇬🇧 403 144 15ms 28 May 2019 176th dzshn 403 144 30ms 18 Aug 2021 176th smokestacklightnin 🇺🇸 403 144 26ms 23 Feb 2024 180th ly0va 400 145 15ms 3 Jan 2019 180th michelebastione 🇮🇹 400 145 28ms 7 Jul 2019 180th rollershutter 400 145 35ms 26 Sep 2025 183rd guliyevemil1 🇦🇿 397 146 15ms 17 Apr 2020 183rd magnickolas 397 146 22ms 19 Nov 2020 183rd m42km 397 146 10ms 10 Oct 2023 186th MaxElf999 395 147 17ms 27 Sep 2022 187th jakobkordez 🇸🇮 392 148 52ms 23 Oct 2022 187th cthierfelder 🇲🇨 392 148 163ms 4 Sep 2025 189th Mabeloid 🇳🇴 389 149 24ms 7 Sep 2024 189th blaztoma 🇱🇹 389 149 28ms 4 Oct 2025 191st bkshrader 387 150 315ms 30 Dec 2018 192nd skps2010 384 151 30ms 12 Jan 2019 192nd sultan 384 151 28ms 9 Mar 2024 194th Ralac07 🇦🇺 379 153 33ms 4 Jul 2024 194th gthayden23 379 153 33ms 4 Oct 2024 196th trist224 🇫🇷 377 154 15ms 29 Nov 2022 196th SniperSmiley 🇺🇸 377 154 41ms 24 Dec 2022 198th boxjelly 372 156 71ms 10 Jan 2021 198th nullie 372 156 558ms 18 Jun 2022 200th gigaprofisi 🇺🇸 369 157 25ms 2 Mar 2025 201st jacobly0 🇺🇸 367 158 10ms 8 Oct 2023 201st christensendaniel 367 158 30ms 13 May 2024 201st Andrey2001 367 158 1,081ms 24 hours ago 204th DABANANAMAN120 365 159 63ms 28 Jun 2025 205th itiievskyi 🇺🇦 363 160 34ms 6 Aug 2020 205th 0dyse 363 160 997ms 23 Apr 2025 207th PyPylia 🇦🇺 356 163 28ms 7 Aug 2020 207th cefqrn 356 163 15ms 13 Apr 2025 209th ashwinvis 354 164 36ms 18 Apr 2020 209th brobbins2001 354 164 33ms 17 Oct 2022 209th codewrite 🇬🇧 354 164 16ms 28 Jun 2025 212th dymowski 352 165 12ms 3 May 2020 213th jtaxen 349 166 14ms 26 Mar 2024 214th Pena86 347 167 12ms 6 Jan 2022 215th msrawson 345 168 14ms 29 Aug 2018 216th LiamKrenn 343 169 36ms 21 Jul 2022 216th dillon-duncando 343 169 127ms 4 Oct 2022 218th epic-programmer-guy 339 171 37ms 17 Dec 2023 219th msbranicky 337 172 38ms 5 Jul 2023 219th LHLaurini 🇧🇷 337 172 143ms 18 Jun 2024 219th yahelihol 337 172 20ms 10 Jun 2025 219th Flekay 🇩🇪 337 172 13ms 10 Jul 2025 223rd TJK-S 333 174 36ms 23 Oct 2025 224th martinnorling 🇸🇪 330 176 15ms 29 Mar 2022 225th roguh 🇬🇹 328 177 32ms 22 Jan 2024 226th AkashTandon167 324 179 160ms 6 Nov 2021 227th alfonsoalves 320 181 39ms 26 Feb 2024 227th Emutis 🇱🇹 320 181 14ms 7 Oct 2025 229th Matistjati 317 183 15ms 2 Dec 2019 230th tetraxile 309 188 30ms 3 Oct 2021 231st LeeCamp 307 189 69ms 15 Feb 2022 232nd Omega65536 🇩🇪 305 190 17ms 1 Dec 2022 233rd PFischbeck 304 191 186ms 8 Dec 2017 233rd luuumine 🇫🇷 304 191 24ms 7 Oct 2025 235th OllieBoyne 🇬🇧 302 192 436ms 23 Jan 2021 236th 52525rr 301 193 24ms 9 Jun 2025 237th sciencedjinn 297 195 14ms 8 Nov 2024 238th rollsroyce0 296 196 40ms 14 Sep 2024 239th lmeuser 293 198 14ms 2 Dec 2017 240th codingisgreatbutiamnot 290 200 37ms 4 Aug 2024 First Prev 161–240 of 328 Next Last