This number is a prime.

                                                               13 4141142143

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The smallest prime formed by concatenating in order four successive semiprimes, i.e., 134, 141,142 and 143. Curiously all four semiprimes contain one digit 4. [Gupta]

Submitted: 2019-03-20 13:21:33;   Last Modified: 2019-03-20 13:46:53.
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