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 A227387 #6 Jul 17 2013 01:14:34 %S A227387 41902660799,41902660801,48886437599,53542288799,55870214401, %T A227387 62853991199,73329656401,80313433201,96376119841,97772875199, %U A227387 97772875201,101264763599,107084577599,107221514401,118356638399,118356638401,125707982401,128501493121,135019684799 %N A227387 Numbers n such that sigma(n)*7 < sigma(n-1) + sigma(n+1). %C A227387 Conjecture: the sequence is infinite. %H A227387 Giovanni Resta, <a href="/A227387/b227387.txt">Table of n, a(n) for n = 1..100</a> %Y A227387 Cf. A000203, A072828. %K A227387 nonn %O A227387 1,1 %A A227387 _Alex Ratushnyak_, Jul 09 2013 %E A227387 a(7)-a(19) from _Giovanni Resta_, Jul 15 2013