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%I #10 May 02 2013 13:02:13
%S 2,5,17,89,107,521,4253,9689,9941,11213,19937,21701,86243,756839,
%T 859433,1398269,2976221,3021377,6972593,25964951,32582657,37156667,
%U 43112609
%N Prime numbers n such that 2^n-1 is a prime that cannot be written in the form a^2+7*b^2.
%C The terms are congruent to 2 (mod 3).
%H Samuel S. Wagstaff, Jr. <a href="http://homes.cerias.purdue.edu/~ssw/cun/index.html">The Cunningham Project</a>
%Y Cf. A216518.
%K nonn
%O 1,1
%A _V. Raman_, Sep 08 2012
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