Partial sums of A029940 (Product_{d|n} phi(d)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =14a(6) =20a(7) =28a(8) =40a(9) =56a(10) =66a(11) =98a(12) =110a(13) =146a(14) =210a(15) =274a(16) =290a(17) =434a(18) =452a(19) =708a(20) =852a(21) =952a(22) =974a(23) =1998a(24) =2078a(25) =2222a(26) =2438a(27) =3302a(28) =3330a(29) =7426