a(n) = prime(4*n-3).

Terms

a(0) =2a(1) =11a(2) =23a(3) =41a(4) =59a(5) =73a(6) =97a(7) =109a(8) =137a(9) =157a(10) =179a(11) =197a(12) =227a(13) =241a(14) =269a(15) =283a(16) =313a(17) =347a(18) =367a(19) =389a(20) =419a(21) =439a(22) =461a(23) =487a(24) =509a(25) =547a(26) =571a(27) =599a(28) =617a(29) =643