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 A058011 #3 Mar 30 2012 17:30:27
%S A058011 1,4,6,8,27,30,33,96,100,120,330,335,340,350,355,360,1008,1080,1092,
%T A058011 1116,1122,1128,1134,3059,3066,3073,3080,3087,3094,8408,8424,8440,
%U A058011 8456,8464,8472,23526,23535,24300,64540,64580,64610,64620,64650,64690,64700
%N A058011 Consider the sequence {b(m)} of nonprimes; sequence gives values of m where gcd{m, b(m)} increases.
%e A058011 a(4) = 8 because eight is the fourth nonprime number and GCD(4,8) > GCD(3,6).
%t A058011 r=0; Do[a = GCD[n, n - PrimePi[n] ]; If[a > r, r = a; Print[n]], {n, 1, 10^5} ]
%Y A058011 Cf. A058012. Apart from initial term same as A057809.
%K A058011 nonn
%O A058011 0,2
%A A058011 _Robert G. Wilson v_, Nov 13 2000