a(n) = prime(n*(n+1)/2+4).

Terms

a(0) =7a(1) =11a(2) =17a(3) =29a(4) =43a(5) =67a(6) =97a(7) =131a(8) =173a(9) =227a(10) =277a(11) =349a(12) =421a(13) =499a(14) =599a(15) =683a(16) =809a(17) =919a(18) =1039a(19) =1181a(20) =1307a(21) =1483a(22) =1621a(23) =1811a(24) =2003a(25) =2207a(26) =2389a(27) =2633a(28) =2819a(29) =3067