1*1 = 1
2*2 = 4
4*2 = 3
3*2 = 1
1*2 = 2
3*3 = 4
4*3 = 2
2*3 = 1
1*3 = 3
4*4 = 1
1*4 = 4
So the generators of (Z5,*) are 2 and 3.
2*2 = 4
4*2 = 3
3*2 = 1
1*2 = 2
3*3 = 4
4*3 = 2
2*3 = 1
1*3 = 3
4*4 = 1
1*4 = 4
So the generators of (Z5,*) are 2 and 3.