prime(n)*( prime(n)-n ).

Terms

a(0) =2a(1) =3a(2) =10a(3) =21a(4) =66a(5) =91a(6) =170a(7) =209a(8) =322a(9) =551a(10) =620a(11) =925a(12) =1148a(13) =1247a(14) =1504a(15) =1961a(16) =2478a(17) =2623a(18) =3216a(19) =3621a(20) =3796a(21) =4503a(22) =4980a(23) =5785a(24) =6984a(25) =7575a(26) =7828a(27) =8453a(28) =8720a(29) =9379