78380domain: NAppears in sequencesa(n) = 196*n^2 - n.at n=19A158003a(n) = 784*n^2 - 2*n.at n=9A158398a(n) = 400*n^2 - 20.at n=13A158597Numbers k such that the last 9 digits of the k-th Lucas number are 1-9 pandigital.at n=24A216488