a(n) = Sum_{k=1..n} k^rad(k).

Terms

a(0) =1a(1) =5a(2) =32a(3) =48a(4) =3173a(5) =49829a(6) =873372a(7) =873436a(8) =874165a(9) =10000874165a(10) =295312544776a(11) =295315530760