Lecture Notes on 17 Jul 2013

def isPrime (n):
  limit = int (n ** 0.5) + 1
  for divisor in range (2, limit):
    if (n % divisor == 0):
      return False
  return True

def main ():
  for i in range (2, 21):
    if (isPrime(i)):
      print (i)

main()