If n = Product (p_j^k_j) then a(n) = Product (p_j + k_j).

Terms

a(0) =1a(1) =3a(2) =4a(3) =4a(4) =6a(5) =12a(6) =8a(7) =5a(8) =5a(9) =18a(10) =12a(11) =16a(12) =14a(13) =24a(14) =24a(15) =6a(16) =18a(17) =15a(18) =20a(19) =24a(20) =32a(21) =36a(22) =24a(23) =20a(24) =7a(25) =42a(26) =6a(27) =32a(28) =30a(29) =72