111

This number is a composite.

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The sum of the emirp pair 37 and 73 plus 1 is a repunit, i.e., 37 + 73 + 1 = 111. Additionally, the sum of n of these emirp pairs plus n is also a repdigit, for n = 2 thru 9. [Wiszowaty]

Submitted: 2020-04-23 16:15:25; Last Modified: 2020-05-06 17:21:56.