Deficient Number

Author

Eric W. Weisstein
February 12, 2008

This notebook downloaded from http://mathworld.wolfram.com/notebooks/Numbers/DeficientNumber.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/DeficientNumber.html.

©2008 Wolfram Research, Inc. except for portions noted otherwise

Enumeration

Select[Range[100],DivisorSigma[1,#]<2#&]