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The smallest sphenic number whose the prime factors are emirps, a 2-digit, a 3-digit and a 4-digit, i.e., 13, 107, 1009 and whose two of the concatenations, i.e, 100913107, 131009107 are, the smaller one a prime and the other an emirp.[ [Loungrides]

Submitted: 2012-11-19 02:18:48;   Last Modified: 2020-05-12 11:13:22.
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