A147612 - OEIS

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A147612

If n is a Jacobsthal number then 1 else 0.

1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`a(A001045(n)) = 1; a(A147613(n)) = 0.`
	LINKS	`Index entries for characteristic functions`
	FORMULA	`a(n) = 0^(j(n,1)*j(n,-1)) with j(n,i) = if n mod 2 = 0 then n else j((n+i)/2,-i).` `a(n)=A105348(n), n<>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 19 2008]`
	CROSSREFS	`Sequence in context: A140820 A167501 A185175 * A080545 A141735 A178225` `Adjacent sequences: A147609 A147610 A147611 * A147613 A147614 A147615`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 08 2008`

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Last modified February 16 09:00 EST 2012. Contains 205904 sequences.