cototient
The cototient function.
Syntax

cototient(n)

n
is an integer

Description
If n
is a positive integer, then totient(n)
is the number of positive integers less than or equal to n
that are relatively prime to n
.
The cototient of n
, cototient(n)
, is defined as n − totient(n)
. This is the number of positive integers less than or equal to n
that have at least one prime factor in common with n
.
Examples
cototient(19871226)
13671162