|
| |
|
|
A145629
|
|
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.
|
|
2
| |
|
|
1, 6, 1, 28, 63, 1386, 1287, 10296, 14586, 277134, 323323, 89237148, 22309287, 401567166, 5822723907, 2888071057872, 722017764468, 361008882234, 6678664321329, 26714657285316, 39117891024927, 3364138628143722
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| For numerators see A145627. For general properties of A_l(x) see A145609.
|
|
|
MAPLE
| 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
|
|
|
MATHEMATICA
| 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*)
|
|
|
CROSSREFS
| Cf. A145609 - A145640.
Sequence in context: A185678 A118394 A147327 * A193633 A176289 A118933
Adjacent sequences: A145626 A145627 A145628 * A145630 A145631 A145632
|
|
|
KEYWORD
| frac,nonn
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Oct 14 2008
|
|
|
EXTENSIONS
| Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 21 2009
|
| |
|
|
