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How many positive integers less than or equal to 500 have exactly 3 divisors?
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How is my answer wrong?

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\[3 = 3
\times 1 \]So the numbers we're looking for are in the form \(a^{3 - 1}b^{1 -1} = a^2\)

There are \(22\) perfect squares \(\le 500\). So my answer turns out to be \(22\)

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