Project Euler 187 - Semiprimes

Official link: https://projecteuler.net/problem=187

Thought Process

The wikipedia link for Semiprimes gives us a quick way to calculate what we want. Uses my primepi function after generating primes, the solution is almost instantaneous

Interactive Code

Enter a number (yourinput)

Code will output the number of composite integers less than yourinput, that have precisely two, not necessarily distinct, prime factors