id:A064911 - OEIS Search Results

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If n semiprime (or 2-almost primes) than 1 else 0.

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

	OFFSET	`1,1`
	COMMENT	`a(A100959(n)) = 0 and a(A001358(n)) = 1. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 24 2004`
	LINKS	`Index entries for characteristic functions` `Eric Weisstein's World of Mathematics, Semiprime` `Eric Weisstein's World of Mathematics, Prime zeta function primezeta(s).`
	FORMULA	`Dirichlet g.f. (primezeta(2s) + primezeta(s)^2)/2. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 09 2006`
	CROSSREFS	`Cf. A064899-A064910, A053409, A046413.` `Sequence in context: A102215 A038189 A072783 this_sequence A099618 A106002 A066247` `Adjacent sequences: A064908 A064909 A064910 this_sequence A064912 A064913 A064914`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 13 2001.`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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