What is the greatest prime factor of 4^17 - 2^30? Choose the correct choice from the following answers
A) 2	B) 3	C) 5	D) 7	E) 11
4^17 - 2^30   =(2^2)^17 - 2^30   = 2^34 - 2^30   = 2^30 (2^4 -1)   = 2^30 * (16-1)   = 2^30 * 15   = 2^30 * 3 * 5   The greatest prime factor is 5.   The answer is 5.
<result>C</result>
What is the greatest prime factor of 4^17 - 2^30?