Posted by Vincent on Wednesday, September 8, 2010 at 4:58am.
5^0+3 = 4
5^1 +3 = 8
5^2+3 = 5*5^1 + 3 = 4*5^1 +5+3 =28
5^3+3 = 5*5^2 + 3 = 4*25 + 5+3 = 128
5^(n+1) + 3 = 5 * 5^n + 3
= 4 *5^n + (5^n+3)
ah ha
4*5^n is divisible by 4 and so is (5^n+3)
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