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 A134858 #14 Aug 09 2017 23:01:00 %S A134858 588107520,67270694400,546939993600,2128050512640,37400697734400, %T A134858 5566067918611200 %N A134858 Numbers that can be written as (a^2 - 1)(b^2 - 1) in five or more distinct ways. %C A134858 Subsequence of A134856 and A134857. %C A134858 Depending on the interpretation of A057535, this is either the same or a supersequence of A057535. [_R. J. Mathar_, Oct 16 2009] %C A134858 The next term (if it exists) is greater than 2^70. %H A134858 MathPages, <a href="http://www.mathpages.com/home/kmath275.htm">Numbers Expressible As (a^2-1)(b^2-1)</a>. %e A134858 588107520 = (13^2 - 1)(1871^2 - 1) = (17^2 - 1)(1429^2 - 1) = (55^2 - 1)(441^2 - 1) = (79^2 - 1)(307^2 - 1) = (129^2 - 1)(188^2 - 1). %Y A134858 Cf. A057535, A134857, A134856, A063067, A063066, A063068. %K A134858 hard,more,nonn %O A134858 1,1 %A A134858 _Herman Beeksma_, Nov 13 2007