1961

This number is a composite.

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The only strobogrammatic tnaillirb concatenated from two double-digit primes and also the only strobogrammatic tnaillirb with prime-digit prime factors, 1961 = 37*53. [Loungrides]

Submitted: 2015-05-23 01:41:18;   Last Modified: 2017-07-23 11:20:15.
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