1 + sum of first n 4-almost primes.

Terms

a(0) =1a(1) =17a(2) =41a(3) =77a(4) =117a(5) =171a(6) =227a(7) =287a(8) =368a(9) =452a(10) =540a(11) =630a(12) =730a(13) =834a(14) =960a(15) =1092a(16) =1227a(17) =1363a(18) =1503a(19) =1653a(20) =1805a(21) =1961a(22) =2145a(23) =2334a(24) =2530a(25) =2728a(26) =2932a(27) =3142a(28) =3362a(29) =3587