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MathNet 2012 Question 59

Math Olympiad Vault · MathNet 2012

Question 59

Given the sequence of real numbers $x_0 = 1$, $x_1 = 1$,
$$
x_n = \sqrt{\frac{n}{2} + x_{n-1}x_{n-2}}, \quad \text{for } n \ge 2,
$$
determine whether there exists a real number $A$ such that $An \lt x_n \lt An+1$ for all $n \in \mathbb{N}$?