4^(n+1) + 5^(2n−1) is always divisible by 21 How can I make an equation that can be verified this by induction
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Originally Posted by DeRSeD 4^(n+1) + 5^(2n−1) is always divisible by 21 How can I make an equation that can be verified this by induction $\displaystyle 4^{n+1}+ 5^{2n-1}= 21k$ for some k.
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