Perfect powers n such that (n-9)/2 is prime.

Terms

a(0) =343a(1) =1331a(2) =12167a(3) =29791a(4) =42875a(5) =79507a(6) =103823a(7) =300763a(8) =357911a(9) =857375a(10) =1520875a(11) =2248091a(12) =2924207a(13) =6436343a(14) =9393931a(15) =11089567a(16) =11697083a(17) =15069223a(18) =15813251a(19) =19487171a(20) =19902511a(21) =20796875a(22) =22665187a(23) =30080231a(24) =51064811a(25) =65450827a(26) =77854483a(27) =80062991a(28) =99252847