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A128779 a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x). 1
1, 1, 2, 3, 8, 5, 60, 63, 896, 189, 5760, 275, 142560, 6435, 256256, 4729725, 40255488, 270725, 916531200, 34613649, 1323008000, 618100875, 412580044800, 1101163525, 13664651083776, 236102414625, 51192627200000, 21986435059875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..28.

MAPLE

a:=n->denom(product(1+frac(n/k), k=1..n)): seq(a(n), n=1..32); # Emeric Deutsch, Mar 30 2007

CROSSREFS

Cf. A128778.

Sequence in context: A170826 A162537 A109844 * A112283 A136182 A170911

Adjacent sequences:  A128776 A128777 A128778 * A128780 A128781 A128782

KEYWORD

frac,nonn

AUTHOR

Leroy Quet, Mar 27 2007

EXTENSIONS

More terms from Emeric Deutsch, Mar 30 2007

STATUS

approved

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Last modified July 29 16:26 EDT 2021. Contains 346346 sequences. (Running on oeis4.)