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%I #11 Aug 01 2013 17:25:02
%S 43,738197503,12384898975268863,198158383604301823,
%T 935776509032580774524280170437362581503,
%U 239558786312340678278215723631964820865023,1243860333603982568026641440523014635142548663400435746517610765710004322303
%N Primes of form 11*2^n-1.
%H <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>
%t Select[11 2^Range[0,250]-1,PrimeQ] (* _Harvey P. Dale_, Mar 30 2011 *)
%Y See A001772 for more terms.
%K nonn,nice
%O 1,1
%A _N. J. A. Sloane_, Dec 29 1999