Jacob’s Descendants who Go to Egypt: The MT Versus the LXX.

A close look at the different references to Jacob’s descendants, and their number in both the MT and the LXX shows how the tradition of Jacob’s descendants developed over time. Genesis 46:8-27, in Parashat Vayigash, lists Jacob’s descendants who came to Egypt; in the Masoretic Text (MT) they total 70, whereas in the Septuagint (LXX), they total 75.  In other words, the MT is missing five names found in the LXX.

http://thetorah.com/jacobs-descendants-who-go-to-egypt-the-mt-versus-the-lxx/