CREATE TABLE table_31839 ("Week" CLOB, "Date" CLOB, "Opponent" CLOB, "Time" CLOB, "Game Site" CLOB, "Result/Score" CLOB, "Record" CLOB)

Tell me the week for pittsburgh steelers opponent
SELECT "Week" FROM table_31839 WHERE "Opponent" = 'pittsburgh steelers'
SELECT "Week" FROM "table_31839" WHERE "Opponent" = 'pittsburgh steelers'