id:A064394 - OEIS Search Results

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Exponent of highest power of 2 dividing n! equals the largest prime < n.

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3

4, 5, 8, 9, 22, 23, 26, 27, 32, 33, 50, 51, 56, 57, 70, 71, 76, 77, 82, 83, 94, 95, 100, 101, 112, 113, 118, 119, 128, 129, 134, 135, 176, 177, 186, 187, 196, 197, 266, 267, 274, 275, 280, 281, 296, 297, 342, 343, 352, 353, 358, 359, 364, 365, 372, 373, 386, 387 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`[n/2]+[n/4]+[n/8]+[n/16]+... = prevprime(n).`
	EXAMPLE	`8!=2^73^257, 23!=2^193^95^47^311^2131719*23.`
	MAPLE	for n from 3 to 10^3 do if sum(floor(n/(2^i)), i=1..15) = prevprime(n) then printf(`%d, `, n) fi; od:
	CROSSREFS	`Cf. A011371, A007917.` `Sequence in context: A020934 A094004 A067271 this_sequence A092022 A026491 A033157` `Adjacent sequences: A064391 A064392 A064393 this_sequence A064395 A064396 A064397`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 29 2001`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Oct 01 2001`

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

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