2357
This number is a prime.
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The reverse concatenation of the two prime derangements
(5273 and 7523) of 2357 is prime: 75235273. Note that
sandwiching the latter between two blocks of prime 2357,
followed by halving at the middle yields a new pair of
primes (23577523 ; 52732357 ) both remaining prime when
every digit is replaced by its respective complement
(87533587 ; 58378753). [Beedassy]
Submitted: 2009-08-10 06:06:53; Last Modified: 2009-08-10 06:58:48.
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