821

This number is a prime.

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The smallest of the prime quadruplet which is the largest of the three 3-digit prime quadruplets {101, 103, 107, 109}, {191, 193, 197, 199} and {821, 823, 827, 829} has, as digital reversal, the number of 6-digit prime quadruplets (128). [Post]

Submitted: 2009-04-01 00:00:34;   Last Modified: 2011-03-07 11:51:54.
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