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MathNet 2012 Question 62

Math Olympiad Vault · MathNet 2012

Question 62

Sequence $\{a_n\}$ is defined by:
$$
a_0 = \frac{1}{2},\ a_{n+1} = a_n + \frac{a_n^2}{2012},\ n = 0, 1, \dots
$$

Find the integer $k$ such that $a_k \lt 1 \lt a_{k+1}$.