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%I #16 Sep 28 2015 20:49:38
%S 2,11,7,2,271,6733,41,11,2,3769453,77647,2,541,1394161003757,13806493,
%T 5,3,1778463179021,193,19,17377902756647509,398407,3,389,137,137867,3,
%U 3,160038737,739,4889866261929241,37,5,48109,3190436507
%N Smallest prime factor of the semiprime 2^A165767(n)-A165767(n).
%C a(n)=2 whenever A165767(n) is even.
%H Max Alekseyev, <a href="/A165768/b165768.txt">Table of n, a(n) for n = 1..39</a>
%F a(n) = (2^A165767(n)-A165767(n))/A165769(n).
%e 17377902756647509 is in this sequence because it is the smallest prime factor of the semiprime 2^199-199.
%K nonn
%O 1,1
%A _M. F. Hasler_, Oct 08 2009
%E More terms from _Max Alekseyev_, Dec 13 2011
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