(5^n)-th prime.

Terms

a(0) =2a(1) =11a(2) =97a(3) =691a(4) =4637a(5) =28687a(6) =171529a(7) =994837a(8) =5653807a(9) =31643347a(10) =174978379a(11) =958200857a(12) =5205329029a(13) =28089376111a(14) =150722620067a(15) =804829625447