primality preserving function?

From: "gsax" <gaurav_iitg@xxxxxxxxx>
Date: 15 Jul 2005 22:43:05 -0700

Hi

I was trying to come up with a function that is primality
preserving..i.e. let the function be f(x)...then I want

f(x) > x
&
f(x) is prime iff x is prime...

I have not been able to produce such a function...

I would like to know , if anyone has a example of such a function..

best regards
Gsax

.

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