Sum of prime power divisors of n (1 included).

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =6a(5) =6a(6) =8a(7) =15a(8) =13a(9) =8a(10) =12a(11) =10a(12) =14a(13) =10a(14) =9a(15) =31a(16) =18a(17) =15a(18) =20a(19) =12a(20) =11a(21) =14a(22) =24a(23) =18a(24) =31a(25) =16a(26) =40a(27) =14a(28) =30a(29) =11