# 3 proper 5

Find the number of positive integers from 1 to 99999 inclusive that have exactly $$3$$ proper divisors.

Details and assumptions

If $$n$$ is a positive integer, a proper divisor of $$n$$ is an integer $$d$$ such that $$1<d<n$$ and $$d$$ divides $$n$$.

You may choose to read Divisors of an Integer.

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