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%I #26 Mar 06 2020 03:34:22
%S 2,5,17,47,127,307,709,1613,3659,8147,17851,38867,84011,180497,386083,
%T 821603,1742527,3681113,7754017,16290041,34136021,71378551,148948133,
%U 310248233,645155191,1339484149,2777105117,5750079043,11891268397,24563311217,50685770143
%N a(n) = prime(2^n - 1).
%H Hugo Pfoertner, <a href="/A051438/b051438.txt">Table of n, a(n) for n = 1..57</a>
%F a(n) = A181363(2^n - 1). - _Reinhard Zumkeller_, Oct 16 2010
%F a(n) = A000040(A000225(n)). - _Michel Marcus_, Nov 28 2017
%t Prime[2^Range[34] - 1] (* _Vladimir Joseph Stephan Orlovsky_, Jul 19 2011 *)
%o (PARI) a(n)=prime(2^n-1) \\ _Charles R Greathouse IV_, Sep 28 2015
%Y Cf. A000040, A000225, A033844, A018249, A051440, A051439.
%K nonn
%O 1,1
%A _N. J. A. Sloane_
%E More terms from Michael Lugo (mlugo(AT)thelabelguy.com), Dec 22 1999
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