Unique Multiplication

OEIS

I solved it using a simple python program but I was curious to see if there was a clever way to do it by hand.

As for the general problem "How many distinct numbers are the result of multiplying two positive numbers less than $x$ ?", my (very) rough calculations show that the answer seems to be something like $\dfrac{x^{1.96}}{\pi}$ (the denominator was close to 3.1 so I figured it must be pi lmao).