CREATE TABLE table_27239 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

What episode number was written by Gregg Hurwitz?
SELECT "No." FROM table_27239 WHERE "Written by" = 'Gregg Hurwitz'
SELECT "No." FROM "table_27239" WHERE "Written by" = 'Gregg Hurwitz'