Smallest prime >= 7^n.

Terms

a(0) =2a(1) =7a(2) =53a(3) =347a(4) =2411a(5) =16811a(6) =117659a(7) =823547a(8) =5764817a(9) =40353611a(10) =282475267a(11) =1977326753a(12) =13841287217a(13) =96889010447a(14) =678223072853