I would live to calculate the primitive roots modulo 26 and modulo 25.
My approach: 26 is not a prime number. But 26=2*13 are Prime numbers. So I calculated the primitive roots of them: Result for 2: 1 Result for 13: 2,6,7,11
So what are the primitive roots of 26? For 25 I know that 25=5*5. But I dont know how it helps.