a(n) = sigma(prime(n)^n) - phi(prime(n)^n).

A271440

a(n) = sigma(prime(n)^n) - phi(prime(n)^n).

Terms

    a(0) =2a(1) =7a(2) =56a(3) =743a(4) =30746a(5) =773527a(6) =49783736a(7) =1837403019a(8) =160181560802

External references