id:A101040 - OEIS Search Results

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If n has one or two prime-factors then 1 else 0.

+0
6

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

	OFFSET	`1,1`
	COMMENT	`a(A033942(n))=0; for n>1: a(A037143(n))=1;` `a(A000040(n))=1; a(A001358(n))=1;` `A101041(n) = Sum(a(k): 1<=k<=n) + 1.`
	FORMULA	`a(n) = A010051(n)+A064911(n) = 0^floor(A001222(n)/3)-0^(n-1).`
	CROSSREFS	`Sequence in context: A106549 A075897 A135947 this_sequence A109720 A022932 A079421` `Adjacent sequences: A101037 A101038 A101039 this_sequence A101041 A101042 A101043`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Nov 28 2004`

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

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