It is somewhat remarkable that Jacob lost Joseph at the age of seventeen: and now the LORD grants the same number of years for them to be together. The intermediate space of Joseph's life, the LORD had other employment for him.
Genesis 47:23-28
23 Then Joseph said unto the people, Behold, I have bought you this day and your land for Pharaoh: lo, here is seed for you, and ye shall sow the land.
24 And it shall come to pass in the increase, that ye shall give the fifth part unto Pharaoh, and four parts shall be your own, for seed of the field, and for your food, and for them of your households, and for food for your little ones.
25 And they said, Thou hast saved our lives: let us find grace in the sight of my lord, and we will be Pharaoh's servants.
26 And Joseph made it a law over the land of Egypt unto this day, that Pharaoh should have the fifth part; except the land of the priestse only, which became not Pharaoh's.
27 And Israel dwelt in the land of Egypt, in the country of Goshen; and they had possessions therein, and grew, and multiplied exceedingly.
28 And Jacob lived in the land of Egypt seventeen years: so the whole age of Jacob was an hundred forty and seven years.