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A145616 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=4. 1

%I

%S 1,3,5,70,315,3465,45045,36036,51051,4849845,1616615,223092870,

%T 557732175,5019589575,145568097675,36100888223400,410237366175,

%U 410237366175,15178782548475,30357565096950,622330084487475

%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=4.

%C For numerators see A145615. For general properties of A_l(x) see A145609.

%t m = 4; 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 1,2

%A _Artur Jasinski_, Oct 14 2008

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

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Last modified September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)