CREATE TABLE table_21747 ("No. in series" TEXT, "No. in season" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

What number in the series are the episodes with production code 5016/5017?
SELECT "No. in series" FROM table_21747 WHERE "Production code" = '5016/5017'
SELECT "No. in series" FROM "table_21747" WHERE "Production code" = '5016/5017'