This number is a prime.

                                                     9 4444666666 9999999999

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The only prime formed by inserting, between the digits of a double-digit number n, the concatenation in ascending order of all the semiprime digits d, d times each of them, n=99. [Bajpai]

Submitted: 2020-04-24 15:09:04;   Last Modified: 2020-04-24 15:45:17.
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