This number is a prime.

                                                             1098 7654321001

Just showing those entries submitted by 'Loungrides': (Click here to show all)

+ 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]

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