Emirps

Emirps, which is Prime spelled backwards, are prime numbers that are "reversible". When their digits are reversed, they can form a different prime number.

This excludes Palindromic Primes, since the result has to be different than the original number.

Examples

 * 13 is the first emirp. When reversed, it becomes 31, which is also a prime number.
 * 17 is the second emirp. When reversed, it becomes 71, which is also a prime number.
 * Since 13 is an emirp, 31 is also an emirp, since the digits becomes 13 when reversed.

The First Few Emirps
13

17

31

37

71

73

79

97

107

113

149

157

311

701

751

941