What is the greatest prime factor of 4^17-2^28?
A) 2
B) 3
C) 5
D) 7
E) 11
Can i get some help on how to solve this?
A) 2
B) 3
C) 5
D) 7
E) 11
Can i get some help on how to solve this?
IMO D.DeeeJaaayyy wrote:What is the greatest prime factor of 4^17-2^28?
A) 2
B) 3
C) 5
D) 7
E) 11
Can i get some help on how to solve this?
4^17 = 2^34
2^34 - 2^28 = 2^28(2^6 - 1) = 2^28 (63).
The factors are, 1, 2, 7, 3.
The greatest prime number is 7.
