CREATE TABLE table_40921 ("Week" FLOAT, "Date" TEXT, "Kickoff  (  ET  ) " TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "NFL.com Recap" TEXT)

What is the Week when the kick off was at 4:05 pm, and the result was w 31 14?
SELECT "Week" FROM table_40921 WHERE "Kickoff ( ET )" = '4:05 pm' AND "Result" = 'w 31–14'
SELECT "Week" FROM "table_40921" WHERE "Kickoff ( ET )" = '4:05 pm' AND "Result" = 'w 31–14'