The Divisor Sigma Function
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When Gaussian integers are selected, the Demonstration returns a plot of the absolute values of DivisorSigma, since the result may be complex.
Contributed by: Michael Croucher (March 2011)
Open content licensed under CC BY-NC-SA
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"The Divisor Sigma Function"
http://demonstrations.wolfram.com/TheDivisorSigmaFunction/
Wolfram Demonstrations Project
Published: March 7 2011