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 A080792 #4 Sep 23 2011 15:54:03 %S A080792 2,5,10,12,15,18,20,21,22,28,50,51,55,58,80,81,82,85,100,102,105,108, %T A080792 110,115,118,120,121,125,150,151,152,158,180,182,185,200,202,208,210, %U A080792 212,218,220,221,225,228,250,252,258,280,282,288,500,505 %N A080792 Numbers which when seen in a mirror are different numbers. %D A080792 P. Giannopoulos, The Brainteasers, unpublished. %Y A080792 Cf. A053701, A080228. %K A080792 base,easy,nonn %O A080792 1,1 %A A080792 P. Giannopoulos (pgiannop1(AT)yahoo.com), Mar 13 2003