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Search: id:A145636
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| A145636 |
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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=15. |
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+0
2
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| 2, 4, 4, 56, 56, 616, 8008, 16016, 816816, 5173168, 5173168, 118982864, 118982864, 356948592, 3450503056, 213931189472, 19448289952, 58344869856, 719586728224, 719586728224, 4214722265312, 1993563631492576, 1993563631492576
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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For numerators see A145637. For general properties of A_l(x) see A145609.
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MATHEMATICA
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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*)
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CROSSREFS
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Cf. A145609 - A145640.
Sequence in context: A068554 A092524 A155952 this_sequence A059052 A065975 A089420
Adjacent sequences: A145633 A145634 A145635 this_sequence A145637 A145638 A145639
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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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