user: Question: What is the lowest series episode with a production code of 406?
Columns: ['Series episode', 'Season episode', 'Title', 'U.S. viewers (millions)', 'Original U.S. airdate', 'Prod. code']
Types: ['real', 'real', 'text', 'text', 'text', 'real']
Sample row: [36.0, 1.0, '"Here Comes the Neighborhood"', '1.541', 'September25,2011', 401.0]
SQL:

assistant: SELECT MIN("Series episode") FROM "Table" WHERE "Prod. code" = 406.0;