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

Terms

a(0) =7a(1) =19a(2) =98a(3) =279a(4) =1206a(5) =1981a(6) =4570a(7) =6347a(8) =11438a(9) =23389a(10) =28460a(11) =48925a(12) =66724a(13) =76763a(14) =100448a(15) =144781a(16) =200466a(17) =221149a(18) =293904a(19) =349911a(20) =379756a(21) =482391a(22) =559620a(23) =691145a(24) =897048a(25) =1012725a(26) =1073044a(27) =1203091a(28) =1270640a(29) =1415897