id:A066570 - OEIS Search Results

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Product of numbers <= n that have a factor in common with n.

+0
2

1, 2, 3, 8, 5, 144, 7, 384, 162, 19200, 11, 1244160, 13, 4515840, 1458000, 10321920, 17, 75246796800, 19, 278691840000, 1080203040, 899245670400, 23, 16686729658368000, 375000, 663152807116800, 7142567040, 209964381084057600, 29, 1229978843118305280000000 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(p) = p if p is a prime.`
	EXAMPLE	`a(7) = 7, a(9) = 369 = 162.`
	CROSSREFS	`a(n) = n!/A001783(n).` `Sequence in context: A136182 A067911 A051696 this_sequence A073656 A047930 A073875` `Adjacent sequences: A066567 A066568 A066569 this_sequence A066571 A066572 A066573`
	KEYWORD	`nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 19 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research