CREATE TABLE table_63286 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "TV Time" CLOB, "Attendance" CLOB)

What week was the opponent the San Diego Chargers?
SELECT COUNT("Week") FROM table_63286 WHERE "Opponent" = 'san diego chargers'
SELECT COUNT("Week") FROM "table_63286" WHERE "Opponent" = 'san diego chargers'