Nils O. Selåsdal
21 lines
404 B
C
21 lines
404 B
C
#include "ucore/math.h"
|
|
|
|
/*
|
|
Euler's Totient Function is denoted by the Greek letter phi, and is defined as follows:
|
|
phi(N) = how many numbers between 1 and N - 1 which are relatively prime to N.
|
|
*/
|
|
uint64_t
|
|
uc_phi_64(uint64_t N)
|
|
{
|
|
uint64_t phi = 1;
|
|
uint64_t i;
|
|
for (i = 2 ; i < N ; ++i){
|
|
if (uc_gcd_64(i, N) == 1){
|
|
++phi;
|
|
}
|
|
}
|
|
|
|
return phi;
|
|
}
|
|
|