CREATE TABLE table_15783 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" TEXT)

Which week was the game held at Kingdome on October 13, 1991?
SELECT MIN("Week") FROM table_15783 WHERE "Game site" = 'kingdome' AND "Date" = 'october 13, 1991'
SELECT MIN("Week") FROM "table_15783" WHERE "Date" = 'october 13, 1991' AND "Game site" = 'kingdome'