e/Jordan's totient function

Information
has gloss	eng: In number theory, Jordans totient function J_k(n) of a positive integer n is the number of k-tuples of positive integers all less than or equal to n that form a coprime (k + 1)-tuple together with n. This is a generalisation of Eulers totient function, which is J1. The function is named after Camille Jordan.
lexicalization	eng: Jordan's totient function
instance of	c/Multiplicative functions