LinearRecursion
PUMaC
Intermediate
2015
Define the sequence $a_i$ as follows: $a_1 = 1, a_2 = 2015$, and $a_n =\frac{na_{n-1}^2}{a_{n-1}+na_{n-2}}$ for $n > 2$. What is the least $k$ such that $a_k < a_{k-1}$?
The solution for this problem is available for
$0.99.
You can also purchase a pass for all available solutions for
$99.