Sum of first n 4-almost primes.

Terms

a(0) =16a(1) =40a(2) =76a(3) =116a(4) =170a(5) =226a(6) =286a(7) =367a(8) =451a(9) =539a(10) =629a(11) =729a(12) =833a(13) =959a(14) =1091a(15) =1226a(16) =1362a(17) =1502a(18) =1652a(19) =1804a(20) =1960a(21) =2144a(22) =2333a(23) =2529a(24) =2727a(25) =2931a(26) =3141a(27) =3361a(28) =3586a(29) =3814