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Ok, so, this code snippet is a reply to this thread: http://www.daniweb.com/software-development/cpp/threads/425821/prime-number-c

From what I understood form the OPs request, is that, he wanted an algorihm which would check for prime numbers in a given range, applying these conditions:

a number is to be considered valid if:

a. the number itself is a prime number.

b. the digits composing the number are prime, like this:

```
37397 is a prime number:
3 is a prime number
37 is a prime number
373 is a prime number
3739 is a prime number
```

I would not recommend this algorithm thou because it's slow, and is based on multiplications and divisions, and it has a lot of conditions to check.

But, it's a "hard" approach to a given problem.

*Edited 4 Years Ago by Lucaci Andrew*