user: Question: Name the date successor seated for Pennsylvania 17th
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Maine 4th', 'Vacant', 'Rep. George Evans resigned in previous congress', 'David Bronson ( W )', 'Seated May 31, 1841']
SQL:

assistant: SELECT "Date successor seated" FROM "Table" WHERE "District" = 'Pennsylvania 17th';