10
Solomon's son was Rehoboam. Abijah was the son of Rehoboam. Asa was the son of Abijah. Jehoshaphat was the son of Asa.
1 Chronicles 3:10 Meaning and Commentary
Ver. 10-14. And Solomon's son was Rehoboam From hence to the end of the fourteenth verse, David's successors are reckoned, according to the order of their reign, unto Josiah and his sons:
Solomon, Rehoboam, Abia, Asa, Jehoshaphat, Joram, Ahaziah, Joash, Amaziah, Azariah, Jotham, Ahaz, Hezekiah, Manasseh, Amon, Josiah, in all sixteen.