id:A065887 - OEIS Search Results

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Smallest number whose square is divisible by n!.

+0
2

1, 2, 6, 12, 60, 60, 420, 1680, 5040, 5040, 55440, 332640, 4324320, 8648640, 43243200, 172972800, 2940537600, 8821612800, 167610643200, 335221286400, 7039647014400, 14079294028800, 323823762662400, 647647525324800 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = A019554(A000142(n)) = sqrt(A065887(n)) = A000142(n)/A055772(n)`
	EXAMPLE	`a(10) = 5040 since 10! = 3628800 and the smallest square divisible by this is 25401600 = 3628800*7 = 5040^2`
	CROSSREFS	`Sequence in context: A058312 A003418 A109935 this_sequence A072181 A126915 A002201` `Adjacent sequences: A065884 A065885 A065886 this_sequence A065888 A065889 A065890`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Nov 27 2001`

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

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