prime factor

im no pro like some ppl on here...but gmat is in 10 days..so let me give it a shot..

break down 4^17 - 2^28

to (2^17)2^17) - 2^28
= 2^34 - 2^28
= 2^28(2^6 - 1)
= 2^28 (63)

Break down 63 into the prime factorization and you get 7 as the highest prime...7 X 3^2..

hence 7...

hope i am correct...

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