id:A033635 - OEIS Search Results

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Square-root-perfect numbers: srsigma(n)=m*n^(1/2) for some integer m.

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4, 64, 48400, 37822470400, 6935904849126400, 11883371958374400, 62796991981158400, 87762493613171048488960000, 874812594495483490385610887270400000000000000 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`If n = Product p(i)^r(i) then srsigma(n) = Product [ (p(i)^(r(i)/2+1/2)-1)/(p(i)^(1/2)-1) ].`
	CROSSREFS	`Sequence in context: A051191 A120581 A030176 this_sequence A138835 A119601 A058438` `Adjacent sequences: A033632 A033633 A033634 this_sequence A033636 A033637 A033638`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research