CREATE TABLE table_73189 ("Series #" FLOAT, "Episode #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original airdate" TEXT)

What is the episode number for series 17?
SELECT "Episode #" FROM table_73189 WHERE "Series #" = '17'
SELECT "Episode #" FROM "table_73189" WHERE "Series #" = '17'