Sum of the prime power divisors of n (not including 1).

Terms

a(0) =0a(1) =2a(2) =3a(3) =6a(4) =5a(5) =5a(6) =7a(7) =14a(8) =12a(9) =7a(10) =11a(11) =9a(12) =13a(13) =9a(14) =8a(15) =30a(16) =17a(17) =14a(18) =19a(19) =11a(20) =10a(21) =13a(22) =23a(23) =17a(24) =30a(25) =15a(26) =39a(27) =13a(28) =29a(29) =10