Numerator of Sum_{k=1..n} phi(k)/k^3.

A072158

Numerator of Sum_{k=1..n} phi(k)/k^3.

Terms

    a(0) =1a(1) =9a(2) =259a(3) =1063a(4) =136331a(5) =15259a(6) =5305837a(7) =21351973a(8) =1740485813a(9) =1745820149

External references