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 A140138 #4 Mar 30 2012 18:54:36 %S A140138 5,10,17,20,34,40,65,68,80,130,136,160,257,260,272,320,341,514,520, %T A140138 544,640,682,1025,1028,1040,1088,1109,1280,1301,1349,1361,1364,2050, %U A140138 2056,2080,2176,2218,2560,2602,2698,2722,2728,4097,4100,4112,4160 %N A140138 Numbers n such that A140080(n) = 2. %Y A140138 Cf. A140080, A140137. %K A140138 nonn %O A140138 1,1 %A A140138 _Nadia Heninger_ and _N. J. A. Sloane_, Jun 08 2008