%I A007670 M2703
%S A007670 3,7,47,73,79,113,151,167,239,241,353,367,457,1367,3041,27529,49207,
%T A007670 160423
%N A007670 Numbers n such that 2^n - 2^(n + 1)/2 + 1 is prime.
%D A007670 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A007670 J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, 
               Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and 
               later supplements.
%H A007670 J. Brillhart et al., <a href="http://www.ams.org/online_bks/conm22/">
               Factorizations of b^n +- 1</a>, Contemporary Mathematics, Vol. 22, 
               Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
%H A007670 S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/
               cun/index.html">The Cunningham Project</a>
%Y A007670 Cf. A006598.
%Y A007670 Sequence in context: A000231 A132565 A129518 this_sequence A074714 A064457 
               A005650
%Y A007670 Adjacent sequences: A007667 A007668 A007669 this_sequence A007671 A007672 
               A007673
%K A007670 hard,nonn
%O A007670 1,1
%A A007670 N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
%E A007670 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 07 2000