a(1)=a(2)=1. a(n+1) = a(n) + a(largest prime dividing n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =5a(5) =10a(6) =12a(7) =24a(8) =25a(9) =27a(10) =32a(11) =64a(12) =66a(13) =132a(14) =144a(15) =149a(16) =150a(17) =300a(18) =302a(19) =604a(20) =609a(21) =621a(22) =653a(23) =1306a(24) =1308a(25) =1313a(26) =1379a(27) =1381a(28) =1393a(29) =2786