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 A063068 #2 Mar 30 2012 18:51:34 %S A063068 9,360,2880,241920,588107520 %N A063068 Smallest number expressible as (a^2-1)(b^2-1) in at least n distinct ways [with b>=a>1]. %C A063068 Note that each term is a multiple of the preceding term (at least up to a(5)). %H A063068 K. S. Brown, <a href="http://www.mathpages.com/home/kmath275.htm">Numbers Expressible as (a^2-1)(b^2-1)</a> %H A063068 K. S. Brown, <a href="http://www.mathpages.com/home/mwlist.htm">MathPages Most Wanted List</a> Problem #14 %e A063068 a(4)=241920 since 241920 =(4^2-1)(127^2-1) =(7^2-1)(71^2-1) =(9^2-1)(55^2-1) =(17^2-1)(29^2-1) %Y A063068 Cf. A057535, A063066, A063067. %K A063068 more,nonn %O A063068 1,1 %A A063068 _Henry Bottomley_, Jul 08 2001