My number:
1. Is a 3-digit number.
2. All its digits are prime digits.
3. A number formed by its 1st 2 digits is prime.
4. So is the number formed by its last 2 digits.
5. It is the smallest number satisfying the above conditions.

Find it.

Rem: The digits in my number do not have to be distinct.

(In reply to re: An indefinite article by Dej Mar)

757 would not work because 57=3*19.

Posted by Math Man on 2011-12-30 11:00:15