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 A067806 #14 Jun 24 2014 01:08:22 %S A067806 10,34,136,169,2402,5329,21004,41164,54722,1060802,5026562,10800112, %T A067806 11108164,14366402,87026656,102944992,10499710072,107000850688, %U A067806 220200311872,924354816004 %N A067806 Numbers n such that sigma(n+1)+sigma(n)=3n. %C A067806 a(21) > 10^13. - _Giovanni Resta_, Jul 11 2013 %t A067806 For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==3n, Print[n]]] %Y A067806 Cf. A068077, A068078. %K A067806 more,nonn %O A067806 1,1 %A A067806 _Benoit Cloitre_, Feb 07 2002 %E A067806 Edited by _Dean Hickerson_, Feb 16 2002 %E A067806 a(17) from _Donovan Johnson_, Jan 31 2009 %E A067806 a(18)-a(20) from _Giovanni Resta_, Jul 11 2013