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%I #10 Apr 20 2020 03:49:25
%S 3,2,11,2,61094071,2,3,2,5,2,17,2,3,2,41,2,147331,2,3,2,19,2,7,2,3,2,
%T 101117,2,5,2,3,2,293,2
%N Smallest prime factor of G+n, where G is any sufficiently large power tower of 3, e.g., Graham's number.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Graham's_number">Graham's number</a>
%e a(2) = 11 because 3^3^3^... + 2 = 0 (mod 11).
%Y Cf. A152178.
%K nonn,more
%O 0,1
%A _Karl W. Heuer_, Nov 28 2008
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