A145634 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=13.
2, 12, 20, 280, 2520, 27720, 27720, 11088, 62832, 5969040, 1989680, 137287920, 686439600, 882565200, 25594390800, 1586852229600, 1586852229600, 11107965607200, 410994727466400, 410994727466400, 16850783826122400
Offset: 1
Programs
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Mathematica
m = 13; 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*)
Extensions
Edited by R. J. Mathar, Aug 21 2009
Comments