Instructional Video
Khan Academy

Khan Academy: Computational Number Theory: The Prime Number Theorem

6th - 8th
How can we estimate the number of primes up to x?
Instructional Video
Khan Academy

Khan Academy: The Prime Number Theorem

9th - 10th
This video lesson from Khan Academy is designed for high school, or college students, who are enrolled in a computer science course. The following question is addressed: How can we estimate the number of primes up to x?