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 A123195 #2 Mar 31 2012 13:20:32
%S A123195 5,7,17,59
%N A123195 Numbers n such that A065507[n] = n.
%C A123195 A065507[n] is the smallest prime q such that (p^q+1)/(p+1) is a prime, where p = Prime(n).
%e A123195 A065507[n] begins {3, 3, 5, 3, 5, 3, 7, 17, 11, 7, 109, 5, 17, 5, 5, 21943, 17,...}.
%e A123195 Thus
%e A123195 a(1) = 5 because A065507[5] = 5,
%e A123195 a(2) = 7 because A065507[7] = 7,
%e A123195 a(3) = 17 because A065507[17] = 17.
%Y A123195 Cf. A065507.
%K A123195 hard,more,nonn
%O A123195 1,1
%A A123195 _Alexander Adamchuk_, Oct 04 2006