Sum of the distinct primes dividing n.

Terms

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