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2005 AIME II Question 11

AIME · 2005 AIME II

Question 11

Let $m$ be a positive integer, and let $a_0,$ $a_1,$ $\ldots,$ $a_m$ be a sequence of real numbers such that $a_0 = 37,$ $a_1 = 72,$ $a_m = 0,$ and $$
a_{k+1} = a_{k-1} - \frac{3}{a_k}
$$ for $k = 1,$ $2,$ $\ldots,$ $m - 1.$ Find $m.$