Numerator of Sum_{k=1..n} phi(k)/k^4.

A072160

Numerator of Sum_{k=1..n} phi(k)/k^4.

Terms

    a(0) =1a(1) =17a(2) =1409a(3) =11353a(4) =7137097a(5) =7147097a(6) =17199059897a(7) =137714029801

External references