user: Question: Namw the minimum production code for 16.04 million viewers
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production Code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [24.0, 1.0, '"The Bus"', 'Paul Holohan', 'Hank Steinberg', 'September25,2003', 175401.0, '16.67']
SQL:

assistant: SELECT MIN("Production Code") FROM "Table" WHERE "U.S. viewers (millions)" = '16.04';