shortcut to finding prime factors of a question?

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Junior | Next Rank: 30 Posts
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prime factor

by NareshCS » Wed Mar 04, 2009 9:30 pm
4^17-2^28
(2^2)^17-2^28
2^34-2^28
2^28*(26-1)
2^28*(64-1)
2^28*63
2^28*7*3^2
the greatest prime factor = 7