Calculating number of relatively primes with x

Revision en1, by Fasho, 2019-09-02 11:18:41

Given a number x and a number y how can I count the number of relatively prime numbers with x that are less then y?

More Formally;

Is there any way to count how many z exists that:(1<=z<=y and gcd(x,z)==1) (x<=4005,y<=10^9).

Sorry for my bad England.


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en1 English Fasho 2019-09-02 11:18:41 314 Initial revision (published)