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 A202277 #7 Mar 30 2012 19:00:28 %S A202277 2,537,639,647,653,655,657,661,663,672,674,684,686 %N A202277 Numbers m such that number of integers k such sigma(k) <= m (A074753) is equal to number of integers k <= m such that sigma(x) = k has no solution (A202276). %C A202277 Numbers m such that A074753(m) - A202276(m) = 0. %C A202277 Numbers m such that A202275(m) = 0 (see graph of A202275). %C A202277 Conjecture: sequence is finite with 13 terms. %Y A202277 Cf. A074753, A202275, A202276, A175523, A007369, A007368, A007609. %K A202277 nonn %O A202277 1,1 %A A202277 _Jaroslav Krizek_, Dec 25 2011