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 A131864 #2 Mar 30 2012 18:50:58 %S A131864 8,9,12,13,24,25,28,29,72,73,76,77,88,89,92,93,128,129,132,133,136, %T A131864 137,138,139,140,141,142,143,144,145,148,149,152,153,154,155,156,157, %U A131864 158,159,168,169,172,173,184,185,188,189,192,193,196,197,200,201,202,203 %N A131864 Numbers m such that A131852(m) < 0. %Y A131864 Cf. A131863, A131855, A131857, A131862. %K A131864 nonn %O A131864 1,1 %A A131864 _Reinhard Zumkeller_, Jul 22 2007