Prime Numbers and Emirps

 

Prime numbers are numbers that have no other factors besides one and the number itself.  Some examples of prime numbers are:  2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 & 37. Emirps are special cases of prime numbers.  A prime number is an emirp if it is still prime when its digits are reversed.  For example, 37 is an emirp because not only is it prime, but so too is 73 (the reverse of 37).   Write a program that will ask for a number.  Expect the user to enter only positive integers from 0 to 32,767.  Then tell if it is: "not prime", "a prime", or "an emirp".  The program should continue until a zero is entered.

 

View - Sample Data File