1619

This number is a prime.

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The smallest nonprime-digit emirp that remains a nonprime-digit emirp when each digit is replaced by its complement (9491). Note that it is also the smallest nonprime-digit emirp that remains an emirp when sandwiched between a pair of prime digits (316193) and that the sum of digits is prime in all cases. [Beedassy]

Submitted: 2010-09-11 12:29:01;   Last Modified: 2021-02-03 21:12:47.
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