'Forty one' in the Bible

And Rehoboam the son of Solomon reigned in Judah. Rehoboam was forty-one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which LORD had chosen out of all the tribes of Israel to put his name

And he reigned forty-one years in Jerusalem. And his grandmother's name was Maacah the daughter of Abishalom [Absalom].