'Forty one' in the Bible

Now Rehoboam the son of Solomon reigned in Judah. Rehoboam was forty-one years old when he became king, and he reigned seventeen years in Jerusalem, the city which the Lord had chosen from all the tribes of Israel to put His name there. And his mother’s name was Naamah the Ammonitess.

He reigned forty-one years in Jerusalem; and his mother’s name was Maacah the daughter of Abishalom.

In the fifteenth year of Amaziah the son of Joash king of Judah, Jeroboam the son of Joash king of Israel became king in Samaria, and reigned forty-one years.

So King Rehoboam strengthened himself in Jerusalem and reigned. Now Rehoboam was forty-one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which the Lord had chosen from all the tribes of Israel, to put His name there. And his mother’s name was Naamah the Ammonitess.