A097946 - OEIS

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A097946

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.

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; refs; listen; history; internal format)

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

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.