Question 9

State True or False. $$2^{2^{2011}} + 1$$ divides $$2^{2^{2012}} - 1$$


Correct Answer: True

Solution

Since $$2^{2012} = 2 \times 2^{2011}$$, $$2^{2^{2012}} - 1 = \left(2^{2^{2011}}\right)^2 - 1 = \left(2^{2^{2011}} - 1\right)\left(2^{2^{2011}} + 1\right)$$. So $$2^{2^{2011}} + 1$$ is a factor, and the statement is True.

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