88888...32211 (37-digits)

This number is a prime.

8888888 8777777766 6666555554 4443332211

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The concatenation in descending order of first eight positive digits using d times each digit d and then followed by 1 is prime. [Loungrides]

Submitted: 2015-10-10 15:32:33; Last Modified: 2019-01-15 19:06:15.