a(1) = 1, a(2) = 2; for n >= 2, a(n+1) = a(n) + sum of the unique prime factors of a(n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =11a(5) =22a(6) =35a(7) =47a(8) =94a(9) =143a(10) =167a(11) =334a(12) =503a(13) =1006a(14) =1511a(15) =3022a(16) =4535a(17) =5447a(18) =5879a(19) =11758a(20) =17639a(21) =18239a(22) =18336a(23) =18532a(24) =18688a(25) =18763a(26) =19439a(27) =22223a(28) =22607a(29) =22704