A074823 - OEIS

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A074823

a(n) = 2^omega(n)*mu(n)^2.

1, 2, 2, 0, 2, 4, 2, 0, 0, 4, 2, 0, 2, 4, 4, 0, 2, 0, 2, 0, 4, 4, 2, 0, 0, 4, 0, 0, 2, 8, 2, 0, 4, 4, 4, 0, 2, 4, 4, 0, 2, 8, 2, 0, 0, 4, 2, 0, 0, 0, 4, 0, 2, 0, 4, 0, 4, 4, 2, 0, 2, 4, 0, 0, 4, 8, 2, 0, 4, 8, 2, 0, 2, 4, 0, 0, 4, 8, 2, 0, 0, 4, 2, 0, 4, 4, 4, 0, 2, 0, 4, 0, 4, 4, 4, 0, 2, 0, 0, 0, 2, 8, 2, 0, 8 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`sum(k=1, n, a(k))= A069201(n)` `Multiplicative with a(p)=2, a(p^e)=0, e>1.` `a(n) = A034444(n)*A008966(n). - R. J. Mathar, Apr 15 2011`
	CROSSREFS	`Cf. A008966.` `Sequence in context: A102706 A105673 A171933 * A159916 A159286 A006462` `Adjacent sequences: A074820 A074821 A074822 * A074824 A074825 A074826`
	KEYWORD	`mult,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 08 2002`
	EXTENSIONS	`Additional comments from Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 30 2002`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.