a(n) = Sum_{p|n, p prime} (p #).

Terms

a(0) =0a(1) =2a(2) =6a(3) =2a(4) =30a(5) =8a(6) =210a(7) =2a(8) =6a(9) =32a(10) =2310a(11) =8a(12) =30030a(13) =212a(14) =36a(15) =2a(16) =510510a(17) =8a(18) =9699690a(19) =32a(20) =216a(21) =2312a(22) =223092870a(23) =8a(24) =30a(25) =30032a(26) =6a(27) =212a(28) =6469693230a(29) =38