Sum of primes <= 3^n.

Terms

a(0) =0a(1) =5a(2) =17a(3) =100a(4) =791a(5) =5830a(6) =42468a(7) =327198a(8) =2575838a(9) =20476640a(10) =166554645a(11) =1353822880a(12) =11150031169a(13) =92258920888a(14) =769310640408