id:A090616 - OEIS Search Results

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Highest power of 4 dividing n!.

+0
7

0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 7, 7, 8, 8, 9, 9, 9, 9, 11, 11, 11, 11, 12, 12, 13, 13, 15, 15, 16, 16, 17, 17, 17, 17, 19, 19, 19, 19, 20, 20, 21, 21, 23, 23, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 28, 28, 31, 31, 32, 32, 33, 33, 33, 33, 35, 35, 35, 35, 36 (list; graph; listen)

	OFFSET	`0,7`
	FORMULA	`a(n) =A090622(n, 4) =[A011371(n)/2] =[([n/2]+[n/4]+[n/8]+[n/16]+...)/2].`
	EXAMPLE	`a(6)=2 since 6!=720 =4^2*45.`
	CROSSREFS	`Cf. A011371, A054861, A027868, A054896.` `Adjacent sequences: A090613 A090614 A090615 this_sequence A090617 A090618 A090619` `Sequence in context: A085089 A069924 A082479 this_sequence A067434 A104103 A029923`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Dec 06 2003`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

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