Search: id:A000979
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%I A000979 M2896 N1161
%S A000979 3,11,43,683,2731,43691,174763,2796203,715827883,2932031007403,
%T A000979 768614336404564651,201487636602438195784363,845100400152152934331135470251,
%U A000979 56713727820156410577229101238628035243,62357403192785191176690552862561408838653121833643
%N A000979 Primes of form (2^p + 1)/3.
%C A000979 a(n) are the Wagstaff primes. a(n) are the primes with prime indices 
               in the Jacobsthal sequence A001045[n]. Numbers n such that (2^n + 
               1)/3 is prime are listed in A000978[n] = {3,5,7,11,13,17,19,23,31,
               43,61,...}. - Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 03 
               2006
%D A000979 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000979 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000979 Editor's Note, Math. Mag., 27 (1954), 157.
%H A000979 T. D. Noe, <a href="b000979.txt">Table of n, a(n) for n=1..20</a>
%H A000979 C. Caldwell's The Top Twenty, <a href="http://primes.utm.edu/top20/page.php?id=67">
               Wagstaff</a>.
%H A000979 S. S. Wagstaff, Jr., <a href="http://homes.cerias.purdue.edu/~ssw/cun/
               index.html">The Cunningham Project</a>.
%H A000979 Wikipedia, <a href="http://en.wikipedia.org/wiki/Wagstaff_prime">Wagstaff 
               prime</a>.
%Y A000979 Cf. A000978, A049883, A001045, A127962.
%Y A000979 Sequence in context: A051257 A135482 A126614 this_sequence A123628 A153476 
               A107290
%Y A000979 Adjacent sequences: A000976 A000977 A000978 this_sequence A000980 A000981 
               A000982
%K A000979 nonn
%O A000979 1,1
%A A000979 N. J. A. Sloane (njas(AT)research.att.com).

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