A128778 a(n) = numerator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).

1, 1, 3, 4, 25, 9, 343, 256, 6561, 1250, 161051, 1728, 4826809, 235298, 11390625, 134217728, 6975757441, 14348907, 322687697779, 4000000000, 264760015527, 207499396808, 952809757913927, 220150628352, 11920928955078125

Offset

1,3

Links

Table of n, a(n) for n=1..25.

Maple

a:=n->numer(product(1+frac(n/k), k=1..n)): seq(a(n), n=1..30); # Emeric Deutsch, Mar 31 2007

Crossrefs

Cf. A128779.

Sequence in context: A065900 A065809 A093600 * A362165 A338425 A304210

Adjacent sequences: A128775 A128776 A128777 * A128779 A128780 A128781

Keyword

frac,nonn

Author

Leroy Quet, Mar 27 2007

Extensions

More terms from Emeric Deutsch, Mar 31 2007

Status

approved