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 A239524 #11 Mar 29 2014 10:41:09 %S A239524 8,9,343,361 %N A239524 Prime powers p (A025475) such that either d1 divides d2, or d2 divides d1, where d1 and d2 are the distances from p to the two nearest prime powers. %C A239524 Note the two nearest prime powers can be both above or both below p. %C A239524 a(5) > 1.6*10^19. - _Giovanni Resta_, Mar 21 2014 %Y A239524 Cf. A025475. %K A239524 nonn,hard,more %O A239524 1,1 %A A239524 _Alex Ratushnyak_, Mar 20 2014