user: Question: What week number saw a W 31-16 result?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 12, 1999', 'New York Giants', 'L 17-13', '65,026']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Result" = 'W 31-16';