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What is the highest prime number that is a factor of 4^17 - [#permalink]
24 Aug 2007, 17:36
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What is the highest prime number that is a factor of 4^17 - 2^28?
Folks this problem I have spent one hour on trying to find a way to solve under 2 minutes. I am absolutely boggled by how to do it. Please tell me this is a difficult problem, maybe even a very difficult one.