a(n) = -1 + Sum_{i=1..n} phi(i).

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =9a(5) =11a(6) =17a(7) =21a(8) =27a(9) =31a(10) =41a(11) =45a(12) =57a(13) =63a(14) =71a(15) =79a(16) =95a(17) =101a(18) =119a(19) =127a(20) =139a(21) =149a(22) =171a(23) =179a(24) =199a(25) =211a(26) =229a(27) =241a(28) =269a(29) =277