user: Question: what week number was at Memorial Stadium?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, '1983-09-04', 'at San Diego Chargers', 'W 41–29', 'Jack Murphy Stadium', 51004.0]
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Game site" = 'Memorial Stadium';