5764809domain: NAppears in sequencesa(n) = 7^n + n.at n=8A226199a(n) = Sum_{d|n} d*sigma_n(d).at n=6A320940a(n) = Sum_{d|n} d * sigma_d(d), where sigma_k(n) is the sum of the k-th powers of the divisors of n.at n=6A344480