Prime(n)*prime(2*n)+prime(n)+prime(2*n).

Terms

a(0) =11a(1) =31a(2) =83a(3) =159a(4) =359a(5) =531a(6) =791a(7) =1079a(8) =1487a(9) =2159a(10) =2559a(11) =3419a(12) =4283a(13) =4751a(14) =5471a(15) =7127a(16) =8399a(17) =9423a(18) =11151a(19) =12527a(20) =13467a(21) =15519a(22) =16799a(23) =20159a(24) =22539a(25) =24479a(26) =26207a(27) =28511a(28) =29919a(29) =32147