991

This number is a prime.

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The largest 3-digit emirp p that does not produce a prime by adding a trailing digit to p. Note that uniquely 167=π(991) and its reversal (761) both have this property. [Worrom]

Submitted: 2022-01-23 17:07:23;   Last Modified: 2022-01-23 18:18:12.
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