For n>(or equal to) 1, use a congruence theory to prove
27 divides 2^(5n+1) + 5^(n+2)
43 divides 6^(n+2) + 7^(2n+1)
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Note that: and try to go on from there
Last edited by PaulRS; November 3rd 2009 at 04:08 AM.
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