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A156277 Numbers appearing at every third row in the third column of A156241. 1
1, -1, 0, 0, -1, 0, -1, 0, 0, 1, -1, 0, -1, 1, 0, 0, -1, 0, -1, 0, 0, 1, -1, 0, 0, 1, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0, -1, 1, 0, 0, -1, 0, -1, 0, 0, 1, -1, 0, 0, 0, 0, 0, -1, 0, 1, 0, 0, 1, -1, 0, -1, 1, 0, 0, 1, 0, -1, 0, 0, -1, -1, 0, -1, 1, 0, 0, 1, 0, -1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The Dirichlet inverse is A011655, and the Mobius inverse is represented by the absolute values of A154271. - R. J. Mathar, Jul 02 2013

LINKS

Table of n, a(n) for n=1..80.

FORMULA

a(n) = -A008683(3n). - R. J. Mathar, Mar 31 2011

MAPLE

seq( -numtheory[mobius](3*n), n=1..80) ; - R. J. Mathar, Mar 31 2011

CROSSREFS

Sequence in context: A114915 A074711 A004585 * A319448 A260595 A177444

Adjacent sequences:  A156274 A156275 A156276 * A156278 A156279 A156280

KEYWORD

easy,sign,mult

AUTHOR

Mats Granvik, Feb 07 2009

STATUS

approved

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Last modified January 17 23:15 EST 2019. Contains 319251 sequences. (Running on oeis4.)