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A181587 If n is even, a(n) = 0, if n is odd, a(n) = A002321(n), where A002321 is Mertens's function. 1
1, 0, -1, 0, -2, 0, -2, 0, -2, 0, -2, 0, -3, 0, -1, 0, -2, 0, -3, 0, -2, 0, -2, 0, -2, 0, -1, 0, -2, 0, -4, 0, -3, 0, -1, 0, -2, 0, 0, 0, -1, 0, -3, 0, -3, 0, -3, 0, -3, 0, -2, 0, -3, 0, -2, 0, -1, 0, -1, 0, -2, 0, -1, 0, 0, 0, -2, 0, -1, 0, -3, 0, -4, 0, -3, 0, -2, 0, -4, 0, -4, 0, -4, 0, -3, 0, -1, 0, -2, 0, -1, 0, 0, 0, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

G.f.: 4.64838508*sin(0.52391183*x)-0.831685761*tan(x*3.34422269/2)

a(n) = A000035(n)*A002321(n).

PROG

(PARI) A181587(n) = if(n%2, sum(k=1, n, moebius(k)), 0); \\ Antti Karttunen, Sep 30 2018

CROSSREFS

Cf. A000035, A002321.

Sequence in context: A053472 A036664 A045843 * A096158 A264782 A053471

Adjacent sequences:  A181584 A181585 A181586 * A181588 A181589 A181590

KEYWORD

sign,look

AUTHOR

Mats Granvik, Oct 31 2010

EXTENSIONS

Definition corrected and more terms by Antti Karttunen, Sep 30 2018

STATUS

approved

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Last modified July 18 11:30 EDT 2019. Contains 325138 sequences. (Running on oeis4.)