id:A107078 - OEIS Search Results

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Indicates that n has non-unitary prime divisors.

+0
3

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

	OFFSET	`1,1`
	COMMENT	`a(n)=1 iff A056170(n)>0, 0 otherwise. a(n)=A107079(n)-A013928(n+1).` `a(n) = 1 - A008966(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 03 2008]`
	LINKS	`Index entries for characteristic functions`
	FORMULA	`a(n)=sum{k=0..n-1, mu(n-k-1) mod 2}-sum{k=0..n-1, mu(n-k) mod 2}`
	CROSSREFS	`Cf. A087049. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 24 2008]` `Sequence in context: A160351 A023969 A060039 this_sequence A163533 A020987 A072786` `Adjacent sequences: A107075 A107076 A107077 this_sequence A107079 A107080 A107081`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 10 2005`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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