id:A146746 - OEIS Search Results

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Numbers n such that sigma_1(n+1)*sigma_1(n)/(sigma_1(n+1)+sigma_1(n))=c, c an integer.

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6, 15, 55, 56, 57, 59, 71, 88, 89, 90, 115, 119, 124, 126, 179, 202, 205, 207, 221, 247, 355, 359, 418, 420, 460, 479, 501, 535, 550, 595, 605, 621, 647, 655, 664, 716, 719, 754, 835, 836, 839, 895, 958 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A000203(n+1)*A000203(n)/(A000203(n+1)+A000203(n)) = c, c an integer.`
	CROSSREFS	`Cf. A083795, A063647, A000203` `Sequence in context: A056423 A056347 A122365 this_sequence A119132 A073065 A093042` `Adjacent sequences: A146743 A146744 A146745 this_sequence A146747 A146748 A146749`
	KEYWORD	`easy,nonn`
	AUTHOR	`Ctibor O. Zizka (c.zizka(AT)email.cz), Nov 01 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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