Dirichlet convolution of primes (with 1) with phi(n).

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =11a(5) =20a(6) =19a(7) =30a(8) =31a(9) =42a(10) =39a(11) =66a(12) =49a(13) =72a(14) =77a(15) =90a(16) =69a(17) =124a(18) =79a(19) =140a(20) =127a(21) =132a(22) =101a(23) =208a(24) =137a(25) =170a(26) =175a(27) =224a(28) =135a(29) =292