id:A099104 - OEIS Search Results

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Characteristic function of badly sieved numbers (A066680).

+0
4

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

	OFFSET	`1,1`
	COMMENT	`a(A066680(n)) = 1;` `A066683(n)=Sum(a(k):1<=k<=n); A066682(n)=a(n)*A066683(n).`
	FORMULA	`a(n) = Prod(if n>d^2 then 1 else 1-a(d): d<n and n mod d = 0); a(1)=0.`
	CROSSREFS	`Sequence in context: A100821 A139689 A073070 this_sequence A048820 A127000 A103226` `Adjacent sequences: A099101 A099102 A099103 this_sequence A099105 A099106 A099107`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Sep 26 2004`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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