a(n) = Sum_{1<=i<=j<=n} prime(i)*prime(j).

Terms

a(0) =4a(1) =19a(2) =69a(3) =188a(4) =496a(5) =1029a(6) =2015a(7) =3478a(8) =5778a(9) =9519a(10) =14479a(11) =21768a(12) =31526a(13) =43609a(14) =59025a(15) =79218a(16) =105178a(17) =135739a(18) =173795a(19) =219164a(20) =271140a(21) =333629a(22) =406171a(23) =491878a(24) =594698a(25) =711959a(26) =842151a(27) =988848a(28) =1150168a(29) =1330177