32184domain: NAppears in sequencesa(n) = 6*a(n-1) - 6*a(n-2) for n > 1; a(0) = 4, a(1) = 15.at n=6A164310Numbers m such that m*reversal(m) contains every decimal digit exactly once.at n=17A178929a(n) is the sum of the Wieferich and Wall-Sun-Sun residues of prime(n).at n=34A339639