Inspired from my status on Facebook:
The prime number 73939133 is very special, if removing each digit from right to left of that number we get another prime numbers: 7393913, 739391, 73939, 7393, 739, 73 and 7.
One of my friends gave a challenge:
Can you write a program reading a number N from keyboard then finding the nearest prime number to N that satisfies the characteristics of 73939133?
As promised him, I would solve this challenge.