1213
This number is a prime.
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The only emirp concatenated from two double-digit numbers
that are sides in an equable triangle, i.e., (5, 12, 13).
(A shape is called equable if its area equals the
perimeter). [Loungrides]
Submitted: 2016-09-18 07:52:56; Last Modified: 2017-12-19 20:06:12.
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