id:A055204 - OEIS Search Results

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Square-free part of n!: n! divided by its largest square divisor.

+0
7

1, 2, 6, 6, 30, 5, 35, 70, 70, 7, 77, 231, 3003, 858, 1430, 1430, 24310, 12155, 230945, 46189, 969969, 176358, 4056234, 676039, 676039, 104006, 312018, 44574, 1292646, 1077205, 33393355, 66786710, 2203961430, 64822395, 90751353, 90751353 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Smallest number such that n!*a(n) is a square.`
	FORMULA	`a(n) = A007913(n!) = n!/A055071 = A000142(n)/A055071(n)`
	EXAMPLE	`10! = 5184007 = 7(720)^2, so a(10) = 7.`
	CROSSREFS	`Cf. A055071, A000142, A007913.` `Sequence in context: A130087 A085087 A072983 this_sequence A008339 A077139 A068629` `Adjacent sequences: A055201 A055202 A055203 this_sequence A055205 A055206 A055207`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jun 19 2000`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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