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Denominator(sum(i=1,n,1/i^5))/denominator(sum(i=1,n,1/i^3)).
0

%I #5 Mar 30 2012 18:38:56

%S 1,4,36,144,3600,10800,529200,2116800,6350400,6350400,768398400,

%T 768398400,129859329600,129859329600,129859329600,519437318400,

%U 150117385017600,450352155052800,162577127974060800,6503085118962432

%N Denominator(sum(i=1,n,1/i^5))/denominator(sum(i=1,n,1/i^3)).

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Apr 03 2002