8017

This number is a prime.

Just showing those entries submitted by 'Keith': (Click here to show all)

8017 is the smallest prime with this property: n*(n+8) is a number comprised of (m) concatenated with (m-8), for some m. 8017 x 8025 = 64336425 = (6433)(6425), which is of the form (m)(m-8). The next prime of this type is 998000001997. [Keith]