cp's OEIS Frontend

A113270 a(n) = sqrt(Product_{k=1..2^n} (Product_{i=1..n} p_i^e_{k,i} + Product_{i=1..n} p_i^(1-e_{k,i}))) * Sum_{i=1..n} ((1/p_i)*Product_{k=1..n} p_k) where p_i is the i-th prime and e_{k,i} is a vector of length n that runs through all combinations of {0,1}.