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A102507 The imaginary part of a complex multiperfect number, see A102506. 6
3, 5, 2, 10, 18, 88, 12, 24, 20, 84, 120, 440, 950, 32, 209, 60, 418, 3800, 2256, 768, 120, 1280, 310, 200, 1152, 3840, 600, 4680, 404, 1712, 1240, 6240, 5016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..33.

MATHEMATICA

lst={}; Do[z=n+k*I; s=DivisorSigma[1, z]; If[Mod[s, z]==0, AppendTo[lst, z]; Print[{z, s, s/z}]], {n, 1200}, {k, 10000}]; Im[lst]

CROSSREFS

Sequence in context: A077975 A258656 A112323 * A076556 A324776 A325891

Adjacent sequences:  A102504 A102505 A102506 * A102508 A102509 A102510

KEYWORD

nonn

AUTHOR

T. D. Noe, Jan 12 2005

STATUS

approved

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Last modified May 31 22:45 EDT 2020. Contains 334756 sequences. (Running on oeis4.)