1. 
   Emirp
   An emirp (prime spelled backwards) is a prime number that results in a different prime when its digits are reversed. This definition excludes the related palindromic primes. The term reversible prime may be used to mean the same as emirp, but may also, ambiguously, include the palindromic primes. T...
   Found op http://en.wikipedia.org/wiki/Emirp
   
   
2. 
   emirp
   A prime number that becomes a different prime number when its digits are reversed ('emirp' is 'prime' spelled backwards). The first twenty emirps are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, and 389. Compare with a palindromic prime (see palindromic numb...
   Found op http://www.daviddarling.info/encyclopedia/E/emirp.html
   
   

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