a(n) = (prime(n)^3 - prime(n^3))/2.

Terms

a(0) =3a(1) =4a(2) =11a(3) =16a(4) =320a(5) =438a(6) =1302a(7) =1594a(8) =3324a(9) =8235a(10) =9417a(11) =17950a(12) =24759a(13) =27349a(14) =36252a(15) =55002a(16) =78861a(17) =84711a(18) =115866a(19) =138056a(20) =146440a(21) =190374a(22) =220857a(23) =277626a(24) =370572a(25) =417629a(26) =435933a(27) =488096a(28) =507799a(29) =565157