A174941 a(n) = Sum_{d|n} A007955(d) * A008683(d) = Sum_{d|n} A007955(d) * mu(d), where A007955(m) = product of divisors of m.

1, -1, -2, -1, -4, 32, -6, -1, -2, 94, -10, 32, -12, 188, 218, -1, -16, 32, -18, 94, 432, 472, -22, 32, -4, 662, -2, 188, -28, -809648

Offset

1,3

Links

Table of n, a(n) for n=1..30.

Example

For n = 4, A007955(n) = b(n): a(4) = b(1)*mu(1) + b(2)*mu(2) + b(4)*mu(4) = 1*1 + 2*(-1) + 8*0 = -1.

Crossrefs

Sequence in context: A354115 A230600 A025506 * A267381 A061655 A009830

Adjacent sequences: A174938 A174939 A174940 * A174942 A174943 A174944

Keyword

sign

Author

Jaroslav Krizek, Apr 02 2010

Status

approved