a(n) = (3/2)*(1/p)*(2*p+1)*(3^p+1)*B(2*p) where p = prime(n) and where B(k) denotes the k-th Bernoulli number.

A090823

a(n) = (3/2)*(1/p)*(2*p+1)*(3^p+1)*B(2*p) where p = prime(n) and where B(k) denotes the k-th Bernoulli number.