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Search: id:A145629
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| A145629 |
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Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=10. |
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+0
2
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| 1, 6, 1, 28, 63, 1386, 1287, 10296, 14586, 277134, 323323, 89237148, 22309287, 401567166, 5822723907, 2888071057872, 722017764468, 361008882234, 6678664321329, 26714657285316, 39117891024927, 3364138628143722
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For numerators see A145627. For general properties of A_l(x) see A145609.
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MAPLE
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A := proc(l, x) add(x^(l-d)/d, d=1..l-1) ; end: A145629 := proc(n) denom( A(2*n+1, 10)) ; end: seq(A145629(n), n=1..20) ; # R. J. Mathar, Aug 21 2009
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MATHEMATICA
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m = 10; 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*)
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CROSSREFS
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Cf. A145609 - A145640.
Sequence in context: A050300 A118394 A147327 this_sequence A118933 A046212 A120105
Adjacent sequences: A145626 A145627 A145628 this_sequence A145630 A145631 A145632
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KEYWORD
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frac,nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 14 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 21 2009
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