user: Question: Which Week has Attendance of 71,740?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 6, 1992', 'Los Angeles Raiders', 'W 17–13', '75,418']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Attendance" = '71,740';