A124579 - OEIS

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A124579

Number of natural numbers less than n which have identical Moebius mu values.

0, 0, 1, 0, 2, 1, 3, 1, 2, 2, 4, 3, 5, 3, 4, 4, 6, 5, 7, 6, 5, 6, 8, 7, 8, 7, 9, 10, 9, 10, 11, 11, 8, 9, 10, 12, 12, 11, 12, 13, 13, 14, 15, 14, 15, 13, 16, 16, 17, 18, 14, 19, 17, 20, 15, 21, 16, 17, 18, 22, 19, 18, 23, 24, 19, 20, 21, 25, 20, 22, 23, 26, 24, 21, 27, 28, 22, 25, 26, 29 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	EXAMPLE	`a(10) = 2 because in the first nine integers less than 10, mu(1) = mu(6) = mu(10).`
	MATHEMATICA	`a[n_] := a[n] = MoebiusMu@n; f[n_] := Count[a /@ Range[n - 1], a@n]; Array[f, 80]`
	CROSSREFS	`Cf. A124580.` `Cf. A008683, A002321.` `Sequence in context: A102862 A029331 A037269 * A035306 A101691 A205379` `Adjacent sequences: A124576 A124577 A124578 * A124580 A124581 A124582`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 05 2006`

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Last modified February 16 21:17 EST 2012. Contains 205971 sequences.