A109899 a(n) = least integer of the form (n+2)(n+4)...(n+2k)/n, or 0 if no such number exists.

3, 2, 105, 12, 27027, 160, 18706545, 15, 1616615, 96768, 55382044433625, 336, 182057820682381875, 158146560, 260015, 495, 5087360695596105163111875, 12812800, 39805919884778682846001415625, 576576, 767633625

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Example

a(3) = 5*7*9/3 = 105.

Maple

A109899 := proc(n) local k; k := 1; while mul(n+2*i, i=1..k) mod n <> 0 do k := k+1; od ; RETURN(mul(n+2*i, i=1..k)/n) ; end: seq(A109899(n), n=1..30) ; # R. J. Mathar, Aug 15 2007

Crossrefs

Cf. A109898.

Sequence in context: A300854 A358596 A323745 * A002297 A183270 A152017

Adjacent sequences: A109896 A109897 A109898 * A109900 A109901 A109902

Keyword

nonn

Author

Amarnath Murthy, Jul 13 2005

Extensions

More terms from R. J. Mathar, Aug 15 2007

Status

approved