user: Question: What is the Week number with a result of l 31–28?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 8, 2002', 'at Cincinnati Bengals', 'W 34–6', '53,705']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Result" = 'l 31–28';