%I #11 Apr 04 2016 23:29:20
%S 9,36,279,2466,179613,1773936,130914099,1293175566,95436354393,
%T 68725813719276,686399210003223,450970305101000586,
%U 36923966682271786989,365180934076808864616,26953995293034312152403,19410199662973054208949126,14149796291401707558973760193,141323271117050318101857059796
%N a(n) = sum_{k=1..n} 3^prime(k).
%e a(2) = 3^prime(1) + 3^prime(2) = 3^2+3^3=36.
%t Accumulate@ Array[3^Prime@ # &, {18}] (* _Michael De Vlieger_, Mar 24 2016 *)
%o (PARI) a(n) = sum(k=1, n, 3^prime(k)); \\ _Altug Alkan_, Mar 24 2016
%Y Cf. A057901.
%K nonn,easy
%O 1,1
%A _Emre APARI_, Mar 24 2016
%E More terms from _Michael De Vlieger_, Mar 24 2016