Sum of first n 7-almost primes.

Terms

a(0) =128a(1) =320a(2) =608a(3) =928a(4) =1360a(5) =1808a(6) =2288a(7) =2936a(8) =3608a(9) =4312a(10) =5032a(11) =5832a(12) =6664a(13) =7636a(14) =8644a(15) =9700a(16) =10780a(17) =11868a(18) =12988a(19) =14188a(20) =15404a(21) =16652a(22) =18110a(23) =19582a(24) =21094a(25) =22662a(26) =24246a(27) =25866a(28) =27498a(29) =29178