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 A249613 #5 Nov 03 2014 10:47:19
%S A249613 81,106,121,133,148,160,162,170,189,211,212,214,237,297,301,313,314,
%T A249613 320,340,352,361,378,381,394,409,410,428,438,442,474,502,512,535,583,
%U A249613 605,609,621,627,645,647,648,657,680,691,692,704,709,710,717,736,742,748
%N A249613 Integers that reach the (1023, 512) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).
%o A249613 (PARI) finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
%o A249613 lista(nn, targ=512) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}
%Y A249613 Cf. A017665, A234534, A249611, A249612, A249614.
%K A249613 nonn
%O A249613 1,1
%A A249613 _Michel Marcus_, Nov 02 2014