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A096126 a(n) = least integer of the form (n^2)!/(n!)^k. 1
1, 3, 280, 2627625, 5194672859376, 5150805819130303332, 1461034854396267778567973305958400, 450538787986875167583433232345723106006796340625 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

(n^2)!/(n!)^(n+1) is an integer for every n (see A057599). Hence k >= n+1. Conjecture: k=n+1 only when n is prime or a power of a prime.

EXAMPLE

a(4) = 16!/(4!)^5 = 2627625 which is not further divisible by 24.

CROSSREFS

Cf. A034841, A057599, A096127.

Sequence in context: A051365 A003706 A068250 * A057599 A054583 A139984

Adjacent sequences:  A096123 A096124 A096125 * A096127 A096128 A096129

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 03 2004

EXTENSIONS

Edited by Don Reble (djr(AT)nk.ca), Jul 04 2004

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.