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%I
%S 66,84,880,3344,4440,10148,18084,18210,28380,35296
%N Numbers n such that 217*2^n+1 is prime.
%H Ray Ballinger, <a href="http://www.prothsearch.net/index.html">Proth Search Page</a>
%H 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 Wilfrid Keller, <a href="http://www.prothsearch.net/riesel2.html">List of primes k.2^n - 1 for k < 300</a>
%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>
%K nonn,hard
%O 1,1
%A _N. J. A. Sloane_.
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