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Curious concatenations (Posted on 2014-10-23) Difficulty: 3 of 5
157 is a prime with a very peculiar attribute: placed either after the previous prime or prior to the next prime produces prime numbers (151157 and 157163 respectively).
257 posesses the same feature.
So do many other primes, 4 of them below 2000.

Please list them.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
computer solutionsCharlie2014-10-23 16:07:43
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