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Greatest prime factor - GMATPrep

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Greatest prime factor - GMATPrep

by AleksandrM » Sun Jul 13, 2008 4:34 pm
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by lightbulb » Sun Jul 13, 2008 4:39 pm
4^17 - 2^28
= (2^2)^17 - 2^28
= 2^34 - 2^28
= 2^28(2^6 - 1)
= 2^28(63)

Greatest number that divides 63 is 7
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