9-16

http://www.oschina.net/question/12_44528

http://forum.ubuntu.org.cn/viewtopic.php?f=86&t=367125

http://blog.chinaunix.net/uid-23960482-id-111808.html

http://www.ruanyifeng.com/blog/2013/08/linux_boot_process.html

#!/usr/bin/python

for num in range(10,20):  #to iterate between 10 to 20
   for i in range(2,num): #to iterate on the factors of the number
      if num%i == 0:      #to determine the first factor
         j=num/i          #to calculate the second factor
         print ‘%d equals %d * %d‘ % (num,i,j)
         break #to move to the next number, the #first FOR
   else:                  # else part of the loop
      print num, ‘is a prime number‘