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A109899 a(n) = least integer of the form (n+2)(n+4)...(n+2k)/n, or 0 if no such number exists. 2
3, 2, 105, 12, 27027, 160, 18706545, 15, 1616615, 96768, 55382044433625, 336, 182057820682381875, 158146560, 260015, 495, 5087360695596105163111875, 12812800, 39805919884778682846001415625, 576576, 767633625 (list; graph; refs; listen; history; text; internal format)
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: A249678 A300854 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

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Last modified December 5 17:42 EST 2019. Contains 329768 sequences. (Running on oeis4.)