%I A050539
%S A050539 1,2,4,5,8,10,14,28,37,38,70,121,122,160,170,253,329,362,454,485,500,
%T A050539 574,892,962,1213,1580,2642,2708,4505,8152,11858,13300,15041,16118,
%U A050539 16778,19069,22769,29020,30298,30377,35942,42817,42869,62024,74629,90449,
               91042,117901,128594,143330,152530,157898,175852,340682,444622,627794,
               729314,777992
%N A050539 Numbers n such that 27*2^n-1 is prime.
%H A050539 Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.net/
               riesel.html">List of primes k.2^n + 1 for k < 300</a>
%H A050539 Wilfrid Keller, <a href="http://www.prothsearch.net/riesel2.html">List 
               of primes k.2^n - 1 for k < 300</a>
%H A050539 <a href="Sindx_Pri.html#riesel">Index entries for sequences of n such 
               that k*2^n-1 (or k*2^n+1) is prime</a>
%H A050539 Kosmaj, <a href="http://www.15k.org/riesellist.htm">Riesel list k<300</
               a>.
%Y A050539 Cf. A032363 = 27*2^n+1 is prime.
%Y A050539 Sequence in context: A163295 A101274 A080222 this_sequence A039895 A105425 
               A032937
%Y A050539 Adjacent sequences: A050536 A050537 A050538 this_sequence A050540 A050541 
               A050542
%K A050539 hard,nonn
%O A050539 1,2
%A A050539 N. J. A. Sloane (njas(AT)research.att.com), Dec 29 1999
%E A050539 More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Aug 17 2004
%E A050539 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008