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%I #8 Sep 25 2013 02:24:56
%S 2880,27720,40320,49920,63360,98280,241920,282744,491400,547200,
%T 604800,950400,970200,1048320,1370880,1614600,1774080,2489760,2608320,
%U 2882880,2923200,3931200,4817400,6126120,7338240,7673400,8426880,10200960
%N Numbers that can be written as (a^2-1)(b^2-1) in three or more distinct ways.
%C Contains A134857 and A134858 as subsequences.
%H MathPages, <a href="http://www.mathpages.com/home/kmath275.htm">Numbers Expressible As (a^2-1)(b^2-1)</a>.
%e 2880 = (2^2-1)(31^2-1) = (3^2-1)(19^2-1) = (5^2-1)(11^2-1).
%Y Cf. A134857, A134858, A057535, A063066, A063067, A063068.
%K easy,nonn
%O 1,1
%A _Herman Beeksma_, Nov 13 2007