An &nbsp; ''emirp'' &nbsp; ('''prime''' spelled backwards) &nbsp; are primes that when reversed &nbsp; (in their decimal representation) &nbsp; are a different prime.

(This rules out palindromic primes.)


;Task:
::* &nbsp; show the first &nbsp; twenty &nbsp; emirps
::* &nbsp; show all emirps between &nbsp; 7,700 &nbsp; and &nbsp; 8,000
::* &nbsp; show the &nbsp; 10,000<sup>th</sup> &nbsp; emirp


In each list, the numbers should be in order.

Invoke the (same) program once per task requirement, this will show what limit is used as the upper bound for calculating surplus (regular) primes. 

The specific method of how to determine if a range or if specific values are to be shown will be left to the programmer.


;See also:
* &nbsp; [https://en.wikipedia.org/wiki/Emirp Wikipedia, Emirp].
* &nbsp; [http://primes.utm.edu/glossary/xpage/emirp.html The Prime Pages, emirp].
* &nbsp; [http://mathworld.wolfram.com/Emirp.html Wolfram MathWorld&trade;, Emirp].
* &nbsp; [https://oeis.org/A006567 The On‑Line Encyclopedia of Integer Sequences, emirps (A6567)].
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