A100889 Real part of the multiplier m of the multiperfect Gaussian integer A100884(n)+i*A100885(n).

1, 2, -1, 2, -1, 2, -2, 1, -1, 0, -3, 1, -3, 0, -2, -4, -3, 1, -4, 2, 0, 3, 0, 1, 3, 3, 4, 3, 0, -1, 0, 5, 3, -5, 4, 0, 4, 0, 0, 0, -4

Offset

1,2

Comments

Let the Gaussian integer z = A100884(n)+i*A100885(n). Then a(n) = Re(m) = Re( sigma(z)/z) .

Links

Table of n, a(n) for n=1..41.

Crossrefs

Cf. A100884, A100885, A100890.

Sequence in context: A133099 A006571 A243906 * A206828 A327164 A094781

Adjacent sequences: A100886 A100887 A100888 * A100890 A100891 A100892

Keyword

sign,more

Author

Yasutoshi Kohmoto

Extensions

Edited, all values replaced by R. J. Mathar, Mar 12 2010

a(10)-a(41) from Amiram Eldar, Feb 10 2020

Status

approved