This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A152177 #10 Apr 20 2020 03:49:25 %S A152177 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 A152177 101117,2,5,2,3,2,293,2 %N A152177 Smallest prime factor of G+n, where G is any sufficiently large power tower of 3, e.g., Graham's number. %H A152177 Wikipedia, <a href="https://en.wikipedia.org/wiki/Graham's_number">Graham's number</a> %e A152177 a(2) = 11 because 3^3^3^... + 2 = 0 (mod 11). %Y A152177 Cf. A152178. %K A152177 nonn,more %O A152177 0,1 %A A152177 _Karl W. Heuer_, Nov 28 2008