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

Terms

a(0) =1a(1) =5a(2) =14a(3) =22a(4) =47a(5) =83a(6) =132a(7) =148a(8) =175a(9) =275a(10) =396a(11) =468a(12) =637a(13) =833a(14) =1058a(15) =1090a(16) =1379a(17) =1487a(18) =1848a(19) =2048a(20) =2489a(21) =2973a(22) =3502a(23) =3646a(24) =3771a(25) =4447a(26) =4528a(27) =4920a(28) =5761a(29) =6661