Opponent of at san francisco 49ers had what lowest week?
CREATE TABLE table_37242 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Venue" text,
    "Attendance" real
)
SELECT MIN("Week") FROM table_37242 WHERE "Opponent" = 'at san francisco 49ers'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Opponent of at san francisco 49ers had what lowest week? ### Input: CREATE TABLE table_37242 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Venue" text,
    "Attendance" real
) ### Response: SELECT MIN("Week") FROM table_37242 WHERE "Opponent" = 'at san francisco 49ers'