Create PS1Part1.py

To see the list of first 1000 prime numbers, please visit: http://primes.utm.edu/lists/small/1000.txt

To see the full assignment sheet: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/assignments/pset1a.pdf