Sum of first n 3-almost primes.

Terms

a(0) =8a(1) =20a(2) =38a(3) =58a(4) =85a(5) =113a(6) =143a(7) =185a(8) =229a(9) =274a(10) =324a(11) =376a(12) =439a(13) =505a(14) =573a(15) =643a(16) =718a(17) =794a(18) =872a(19) =964a(20) =1062a(21) =1161a(22) =1263a(23) =1368a(24) =1478a(25) =1592a(26) =1708a(27) =1825a(28) =1949a(29) =2074