52001domain: NAppears in sequencesa(n) = floor(n*phi^18), where phi is the golden ratio, A001622.at n=9A004933a(n+1) = floor( (a(n) + 1)^(1 + 1/n) ), with a(1) = 1.at n=12A080869a(n) = Sum_{1<=i<j<k<=n} P(i)*P(j)*P(k), where P(m) is the k-th Pell number A000129(m).at n=6A213788a(n) = prime(n) * prime(2n).at n=34A319613