'Thirty one' in the Bible

the king of Tirzah, one: in all, thirty-one kings.

Josiah was eight years old when he began to reign; and he reigned thirty-one years in Jerusalem; and his mother's name was Jedidah, daughter of Adaiah of Bozcath.

Josiah was eight years old when he began to reign; and he reigned thirty-one years in Jerusalem.