69999...32211 (47-digits)

This number is a prime.

6999999 9998888888 8777777766 6666555554 4443332211

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The only prime formed by inserting between the digits of a double-digit prime p, the concatenation in descending order of all the digits d times each digit d, i.e., case p=61. [Loungrides]

Submitted: 2018-01-21 16:50:04; Last Modified: 2020-06-27 14:40:24.