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

Author

Yasutoshi Kohmoto

Keywords

• sign
• more

Comments

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

Crossrefs

Cf. A100884, A100885, A100890.

Extensions

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

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