id:A067911 - OEIS Search Results

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Product of GCD(k,n) for 1 <= k <= n.

+0
5

1, 2, 3, 8, 5, 72, 7, 128, 81, 800, 11, 41472, 13, 6272, 30375, 32768, 17, 3359232, 19, 20480000, 750141, 247808, 23, 13759414272, 15625, 1384448, 1594323, 5035261952, 29, 30233088000000, 31, 2147483648, 235782657, 37879808 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..500`
	FORMULA	`a(n) = Product_{ d divides n } d^phi(n/d). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Mar 08 2004`
	CROSSREFS	`Cf. A018804, where product is replaced by sum.` `Product of terms in n-th row of A050873.` `Sequence in context: A128779 A112283 A136182 this_sequence A051696 A066570 A073656` `Adjacent sequences: A067908 A067909 A067910 this_sequence A067912 A067913 A067914`
	KEYWORD	`nonn`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), Mar 10 2002`
	EXTENSIONS	`Extended and edited by John W. Layman (layman(AT)math.vt.edu) Mar 14 2002`

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

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