When Adam had lived 130 years, he had a son in his own likeness, in his own image; and he named him Seth.
Genesis 5:3 (NIV)
We are told something specific about Adam and Seth that we aren’t told about the rest of the genealogy.
Before you say that the text “wouldn’t include any unnecessary repetition,” keep in mind that the whole chapter is repetition. The differences are meant to stand out.