Adam gets 18 mentions in the Bible:
9 in the first five chapters of Genesis (understandable)
1 in the very first verse of one Chronicles (the very first entry in that mega family tree)
1 in Hosea ("But like Adam they transgressed the covenant; there they dealt faithlessly with me.")
1 in the gospel of Luke (Jesus' family tree)
1 in Romans (the (in)famous 'original sin' section)
2 in first Corinthians (in the context of death and resurrection)
2 in the first letter to Timothy (used as a precedent)
1 in Jude (indirect mention)
For comparison Eve gets: 4, Melchizedek gets 10, Moses gets 787 and Jesus gets 925 mentions in the Bible