id:A106405 - OEIS Search Results

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Number of odd semiprimes dividing n.

+0
3

0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 2, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 2, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 2, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 2, 1, 0, 1, 0, 1, 0, 0, 1, 2, 1, 0, 1, 0, 0, 3 (list; graph; listen)

	OFFSET	`1,45`
	COMMENT	`a(n) = A086971(n) - A106404(n);` `a(A046315(n)) = 1; a(A093641(n)) = 0; a(A105441(n)) > 0.`
	EXAMPLE	`a(105) = #{15, 21, 35} = #{35, 37, 5*7} = 3.`
	CROSSREFS	`Cf. A001227, A000005.` `Sequence in context: A030216 A159459 A143078 this_sequence A089310 A129753 A147693` `Adjacent sequences: A106402 A106403 A106404 this_sequence A106406 A106407 A106408`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 02 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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