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Prime Factor Question (GMAT Prep Exam)

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Junior | Next Rank: 30 Posts
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by manred » Tue Jul 24, 2007 8:29 pm
4^17 - 2^28
= 2^34 - 2^28
= 2^28 (2^6 - 1)
=2^28 (64 - 1)
=2^28 * (63)
=2^28 * (9 * 7)
=2^28 * 3^2 * 7

So the prime factors of (4^17 - 2^28 ) are 2, 3, 7

Hence the greatest prime factor is 7.
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Newbie | Next Rank: 10 Posts
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by abbyyip » Thu Jul 26, 2007 3:27 pm
wow thanks so much!
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