id:A025527 - OEIS Search Results

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a(n) = n!/LCM{1,2,...,n} = (n-1)!/LCM{C(n-1,0),C(n-1,1),...,C(n-1,n-1)}.

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1, 1, 1, 2, 2, 12, 12, 48, 144, 1440, 1440, 17280, 17280, 241920, 3628800, 29030400, 29030400, 522547200, 522547200, 10450944000, 219469824000, 4828336128000, 4828336128000, 115880067072000, 579400335360000, 15064408719360000 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(n)=a(n-1) iff n is prime. Thus a(1)=a(2)=a(3)=1 is the only triple in this sequence. - Franz Vrabec (franz.vrabec(AT)aon.at), Sep 10 2005` `a(k)=a(k+1) for k=A006093. - Lekraj Beedassy (blekraj(AT)yahoo.com), Aug 03 2006` `a(n) are the partial products of A048671(n). [From Peter Luschny (peter(AT)luschny.de), Sep 09 2009]`
	LINKS	`Index entries for sequences related to lcm's`
	FORMULA	`a(n)=A000142(n)/A003418(n)=A000254(n)/A025529(n). - Franz Vrabec (franz.vrabec(AT)aon.at), Sep 13 2005`
	EXAMPLE	`a(5) = 2 as 5!/LCM(1..5) = 120/60 = 2.`
	MAPLE	`seq(n!/lcm($1..n), n=1..30);`
	CROSSREFS	`Sequence in context: A109767 A131121 A055772 this_sequence A092144 A059187 A054916` `Adjacent sequences: A025524 A025525 A025526 this_sequence A025528 A025529 A025530`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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