# Funnily familiar

The output of hilarious can be approximated as $\sqrt{ na }$, where $n$ is a positive integer. What is $a$?

 1 2 3 4 5 6 7 8 9 def hilarious(n): j = 1 i = 0 s = 0 while i < n: i += j s += 1 j += 1 return s 

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