2431

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The smallest 2-sphenic number, i.e., a 3-almost prime with distinct double-digit prime factors. Note, that it consists of the first four positive digits and it can be represented as the product of first three double-digit primes, 11*13*17, whose the concatenation in order, i.e., 111317, is prime. [Loungrides]

Submitted: 2015-05-18 04:25:26;   Last Modified: 2017-12-19 08:18:39.
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