Cototient

Author

Eric W. Weisstein
April 30, 2014

This notebook downloaded from http://mathworld.wolfram.com/notebooks/NumberTheoreticFunctions/Cototient.nb.

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

©2014 Wolfram Research, Inc. except for portions noted otherwise

Compute

Table[n-EulerPhi[n],{n,20}]