A146747 - OEIS

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A146747

Numbers n such that sigma_1(n)*sigma_0(n)/(sigma_1(n)-sigma_0(n))=c, c an integer.

2, 3, 5, 6, 7, 20, 30 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`A000203(n)*A000005(n)/(A000203(n)-A000005(n)) = c, c an integer.`
	CROSSREFS	`Cf. A083795, A063647, A000203, A000005` `Sequence in context: A073721 A090745 A002229 * A077674 A067077 A067183` `Adjacent sequences: A146744 A146745 A146746 * A146748 A146749 A146750`
	KEYWORD	`easy,nonn`
	AUTHOR	`Ctibor O. Zizka (c.zizka(AT)email.cz), Nov 01 2008`

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Last modified February 16 23:43 EST 2012. Contains 205978 sequences.