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 A138884 #2 Mar 30 2012 17:33:54 %S A138884 1,3,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,23,24,25,26,27,28, %T A138884 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51, %U A138884 52,53,54,55,56,57,58,59,60,61,62,63,65 %N A138884 Numbers that are not even superperfect numbers. %C A138884 Also, numbers that are not superperfect numbers A019279, if there are no odd superperfect numbers. %Y A138884 Even superperfect numbers: A061652. Cf. A019279, A132999, A133398. %K A138884 nonn %O A138884 1,2 %A A138884 _Omar E. Pol_, Apr 06 2008