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a(n) = 2^(3*prime(n) + 1).
2

%I #15 Sep 08 2022 08:45:15

%S 128,1024,65536,4194304,17179869184,1099511627776,4503599627370496,

%T 288230376151711744,1180591620717411303424,

%U 309485009821345068724781056,19807040628566084398385987584,5192296858534827628530496329220096

%N a(n) = 2^(3*prime(n) + 1).

%e a(1) = 2^(3*2 + 1) = 128.

%t Table[2^(3Prime[n] + 1), {n, 1, 15}] (* _Stefan Steinerberger_, Feb 28 2006 *)

%o (Magma) [2^(3*NthPrime(n) + 1): n in [1..20]]; // _Vincenzo Librandi_, Aug 27 2015

%Y Cf. A004171, A013730.

%K nonn

%O 1,1

%A _Parthasarathy Nambi_, Dec 02 2004

%E More terms from _Stefan Steinerberger_, Feb 28 2006