id:A097946 - OEIS Search Results

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a(n) = A008683(n)*A014197(n) where A008683 is the Moebius (or Mobius) function mu(n) and A014197 is the number of numbers m with Euler phi(m) = n.

+0
1

2, -3, 0, 0, 0, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, -2, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, -2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For n < 93 and a(n) not 0, n = p - 1 where p is prime and therefore in A077064 (Square-free numbers of form prime - 1.)`
	CROSSREFS	`Cf. A008683 A014197 A077064 A000010.` `Sequence in context: A048735 A102037 A152857 this_sequence A083926 A024466 A021817` `Adjacent sequences: A097943 A097944 A097945 this_sequence A097947 A097948 A097949`
	KEYWORD	`sign`
	AUTHOR	`Gerald McGarvey (Gerald.McGarvey(AT)comcast.net), Sep 04 2004`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

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