88888...99999 (39-digits)

This number is a prime.

888888885 5555777777 7444466666 6999999999

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The largest prime concatenated from the six largest rep-digit numbers, each of them formed by using d times the digit d, i.e., 4444, 55555, 666666, 7777777, 88888888, 999999999. [Loungrides]

Submitted: 2020-03-31 04:39:16; Last Modified: 2020-06-25 15:59:41.