user: Question: What week had attendance of 64146?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 15, 1974', 'Philadelphia Eagles', 'W 7-3', 40322.0]
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Attendance" = 64146.0;