A173872 - OEIS

%I #12 Aug 21 2014 00:41:21

%S 13,37,181,373,757,3061,6133,12277,196597,1572853,25165813,805306357,

%T 3221225461,6442450933,12884901877,26388279066613,3377699720527861,

%U 1813388729421943762059253

%N Primes of the form 12*2^n - 11.

%H Vincenzo Librandi, <a href="/A173872/b173872.txt">Table of n, a(n) for n = 1..33</a>

%p select(isprime,[seq(12*2^n-11,n=1..1000)]); # _Robert Israel_, Aug 20 2014

%t Select[NestList[2#+11&,13,80],PrimeQ] (* _Harvey P. Dale_, Jun 18 2013 *)

%Y Cf. A139697

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Mar 05 2010