(9^n)-th prime.

Terms

a(0) =2a(1) =23a(2) =419a(3) =5519a(4) =65687a(5) =733561a(6) =7867547a(7) =82064027a(8) =839001721a(9) =8448283757a(10) =84064182061a(11) =828513359549