CREATE TABLE table_24765 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

What's the series number of the episode seen by 17.04 million people in the US?
SELECT MAX("No. in series") FROM table_24765 WHERE "U.S. viewers (millions)" = '17.04'
SELECT MAX("No. in series") FROM "table_24765" WHERE "U.S. viewers (millions)" = '17.04'