A145636 - OEIS

A145636

Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=15.

%I #4 Mar 31 2012 10:22:14

%S 2,4,4,56,56,616,8008,16016,816816,5173168,5173168,118982864,

%T 118982864,356948592,3450503056,213931189472,19448289952,58344869856,

%U 719586728224,719586728224,4214722265312,1993563631492576,1993563631492576

%N Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=15.

%C For numerators see A145637. For general properties of A_l(x) see A145609.

%t m = 15; aa = {}; Do[k = 0; Do[k = k + m^(2 r + 1 - d)/d, {d, 1, 2 r}]; AppendTo[aa, Denominator[k]], {r, 1, 30}]; aa (*Artur Jasinski*)

%Y Cf. A145609 - A145640.

%K frac,nonn

%O 1,1

%A _Artur Jasinski_, Oct 14 2008

%E Edited by _R. J. Mathar_, Aug 21 2009