Sum of the first 3^n primes.

Terms

a(0) =2a(1) =10a(2) =100a(3) =1264a(4) =15116a(5) =171148a(6) =1864190a(7) =19697700a(8) =203534530a(9) =2067129306a(10) =20706364528a(11) =205144046742