Consider the sequence defined by $a_k=\frac 1{k^2+k}$ for $k\ge 1$. Given that $a_m+a_{m+1}+\cdots+a_{n-1}=\frac{1}{29}$, for positive integers $m$ and $n$ with $m<n$, find $m+n$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Consider the sequence defined by $a_k=\frac 1{k^2+k}$ for $k\ge 1$. Given that $a_m+a_{m+1}+\cdots+a_{n-1}=\frac{1}{29}$, for positive integers $m$ and $n$ with $m<n$, find $m+n$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
840
Consider the sequence defined by $a_k=\frac 1{k^2+k}$ for $k\ge 1$. Given that $a_m+a_{m+1}+\cdots+a_{n-1}=\frac{1}{29}$, for positive integers $m$ and $n$ with $m<n$, find $m+n$.
train