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 A231545 #6 Nov 12 2013 14:34:04 %S A231545 2,6,8586,16120,29886160 %N A231545 Numbers n such that n = sigma(n) - sigma(n-1). %C A231545 Also, numbers n such that antisigma(n) = antisigma(n-1), where antisigma(n) = A024816(n) = the sum of the non-divisors of n that are between 1 and n. %C A231545 Numbers n such that A163553(n-1) = 0. %F A231545 a(n) = A067816(n) + 1. %e A231545 6 is in sequence because antisigma(6) = antisigma(5) = 9. %Y A231545 Cf. A067816, A024816 (antisigma(n)), A231546 (numbers n such that sigma(n) = sigma(n-1)). %K A231545 nonn %O A231545 1,1 %A A231545 _Jaroslav Krizek_, Nov 11 2013