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Old 2016-03-16, 00:08   #6
a1call
 
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"Rashid Naimi"
Oct 2015
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Here is one special case as a category:
Quote:
A circular prime number is a number that remains prime on any cyclic rotation of its digits (in base 10).
https://en.wikipedia.org/wiki/List_o...ircular_primes

Another:

Quote:
Primes that become a different prime when their decimal digits are reversed. The name "emirp" is obtained by reversing the word "prime".
https://en.wikipedia.org/wiki/List_o...numbers#Emirps

Last fiddled with by a1call on 2016-03-16 at 00:11
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