129601domain: NAppears in sequencesa(n) = A006190(n) * A006190(n+2).at n=4A138365Triangle read by rows, derived from a(n) = N*a(n-1) + a(n-2).at n=25A138765A239459(n) / n.at n=35A239462Smallest base b such that there exist exactly n Wieferich pseudoprimes (composites c satisfying b^(c-1) == 1 (mod c^2)) less than b.at n=19A255885