:confused:
hi
I want to ask 2 questions and please answer me quickly I have quiz in Tuesday

1.Show that if a is an integer such that a is not divisible by 3 or such that a is divisible by 9 then
a to the power 7≡ a (mod 63)

2.About Euler phi function:
For which positive integers n is Ф(n)| n??
and thanks a lot
ola...