A076369 - OEIS

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A076369

n + mu(n), where mu is the Moebius-function (A008683).

2, 1, 2, 4, 4, 7, 6, 8, 9, 11, 10, 12, 12, 15, 16, 16, 16, 18, 18, 20, 22, 23, 22, 24, 25, 27, 27, 28, 28, 29, 30, 32, 34, 35, 36, 36, 36, 39, 40, 40, 40, 41, 42, 44, 45, 47, 46, 48, 49, 50, 52, 52, 52, 54, 56, 56, 58, 59, 58, 60, 60, 63, 63, 64, 66, 65, 66, 68, 70, 69, 70, 72 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) = n iff n is not squarefree:` `a(A013929(k))=A013929(k) and a(A005117(k))<>A005117(k).`
	FORMULA	`a(n)=n+MoebiusMu[n]=A000027[n]+A008683[n].`
	CROSSREFS	`Cf. A000027, A008683, A063015, A076840.` `Sequence in context: A073252 A134005 A132320 * A072727 A057061 A034804` `Adjacent sequences: A076366 A076367 A076368 * A076370 A076371 A076372`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com) and Labos E. (labos(AT)ana.sote.hu), Oct 14 2002`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.