41223...99997 (47-digits)

This number is a prime.

4122333 4444555556 6666677777 7788888888 9999999997

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The only prime formed by inserting, between the digits of a double-digit number n, the concatenation in order of all the digits d, d times each of them, n=47. [Loungrides]

Submitted: 2018-04-25 16:33:09; Last Modified: 2018-05-26 12:48:57.