CREATE TABLE table_19600 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production Code" FLOAT, "U.S. viewers  ( millions ) " CLOB)

Namw the minimum production code for 16.04 million viewers
SELECT MIN("Production Code") FROM table_19600 WHERE "U.S. viewers (millions)" = '16.04'
SELECT MIN("Production Code") FROM "table_19600" WHERE "U.S. viewers (millions)" = '16.04'