Numbers of the form 3^n+2 which are not primes.

Terms

a(0) =245a(1) =731a(2) =2189a(3) =19685a(4) =177149a(5) =531443a(6) =1594325a(7) =43046723a(8) =129140165a(9) =387420491a(10) =1162261469a(11) =3486784403a(12) =10460353205a(13) =31381059611a(14) =94143178829a(15) =847288609445