'Thirty one' in the Bible

the king of Tirzah, one; all the kings, thirty-one.

Josiah was eight years old when he began to reign, and he reigned thirty-one years in Jerusalem. The name of his mother [was] Jedidah the daughter of Adaiah from Bozkath.

Josiah [was] eight years old when he became king, and he reigned thirty-one years in Jerusalem.