66667
This number is a composite.
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The only brilliant number less than a googol of form (6)w7,
i.e., (66667=163 × 409), whose both concatenations of prime
factors, i.e., 163409 and 409163 are primes. In addition,
the first of them, 163409, is an emirp. [Loungrides]
Submitted: 2019-10-14 09:03:47; Last Modified: 2021-10-31 00:17:18.
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