id:A124579 - OEIS Search Results

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

+0
2

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; listen)

	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 this_sequence A035306 A101691 A070094` `Adjacent sequences: A124576 A124577 A124578 this_sequence A124580 A124581 A124582`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 05 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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