This number is a composite.

                                                       3931117139 9719337397

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A composite string S formed from the digits 1, 3, 7 and 9. There are 74 primes embedded in S, read left-to-right only. This is the maximal quantity known for 20 digits. Found by Dmitry Kamenetsky. [Rivera]

Submitted: 2019-01-12 18:56:56;   Last Modified: 2019-01-12 20:06:19.
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