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The number is an integer

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Tolaso J Kos
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The number is an integer

#1

Post by Tolaso J Kos » Sat Feb 11, 2017 10:46 pm

Prove that the number

$$\mathcal{N}=(2+\sqrt{3})^n +(2-\sqrt{3})^n$$

is an integer.
Imagination is much more important than knowledge.
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