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

Terms

a(0) =1a(1) =3a(2) =9a(3) =17a(4) =37a(5) =49a(6) =91a(7) =123a(8) =177a(9) =217a(10) =327a(11) =375a(12) =531a(13) =615a(14) =735a(15) =863a(16) =1135a(17) =1243a(18) =1585a(19) =1745a(20) =1997a(21) =2217a(22) =2723a(23) =2915a(24) =3415a(25) =3727a(26) =4213a(27) =4549a(28) =5361a(29) =5601