10987654321001

This number is a prime.

1098 7654321001

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The only emirp formed by inserting the digit sequence in descending order, i.e., 9, 8, … , 1, 0, between a double-digit number n and its reversal R(n), case n=10. [Loungrides]

Submitted: 2015-10-04 13:16:00; Last Modified: 2018-05-09 13:06:06.