Sum of first n 8-almost primes.

Terms

a(0) =256a(1) =640a(2) =1216a(3) =1856a(4) =2720a(5) =3616a(6) =4576a(7) =5872a(8) =7216a(9) =8624a(10) =10064a(11) =11664a(12) =13328a(13) =15272a(14) =17288a(15) =19400a(16) =21560a(17) =23736a(18) =25976a(19) =28376a(20) =30808a(21) =33304a(22) =36220a(23) =39164a(24) =42188a(25) =45324a(26) =48492a(27) =51732a(28) =54996a(29) =58356