CREATE TABLE table_63287 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "TV Time" TEXT, "Attendance" TEXT)

What week was the result of l 38 21?
SELECT MAX("Week") FROM table_63287 WHERE "Result" = 'l 38–21'
SELECT MAX("Week") FROM "table_63287" WHERE "Result" = 'l 38–21'