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 A023584 #5 Dec 12 2012 18:24:56 %S A023584 1,1,2,1,1,2,1,1,2,1,1,1,4,1,1,1,2,2,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,1, %T A023584 3,1,1,2,2,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,3,2,1,1,1,1,1,2,1,3,4,1,1,1, %U A023584 2,1,1,1,1,1,1,2,1,1,2,1,3,2,1,1,1,1,1,1,1,2,1,1,1,2,1,1,2,1,1 %N A023584 Greatest exponent in prime-power factorization of 2*p(n)-1. %H A023584 Harvey P. Dale, <a href="/A023584/b023584.txt">Table of n, a(n) for n = 1..1000</a> %t A023584 Max[Transpose[FactorInteger[2 #-1]][[2]]]&/@Prime[Range[100]] (* _Harvey P. Dale_, Dec 12 2012 *) %K A023584 nonn %O A023584 1,3 %A A023584 _Clark Kimberling_