a(n) = prime(n)*prime(n+1) - prime(n).

Terms

a(0) =4a(1) =12a(2) =30a(3) =70a(4) =132a(5) =208a(6) =306a(7) =418a(8) =644a(9) =870a(10) =1116a(11) =1480a(12) =1722a(13) =1978a(14) =2444a(15) =3074a(16) =3540a(17) =4026a(18) =4690a(19) =5112a(20) =5694a(21) =6478a(22) =7304a(23) =8544a(24) =9700a(25) =10302a(26) =10918a(27) =11556a(28) =12208a(29) =14238