86666...44449 (29-digits)

This number is a prime.

866666688 8888889999 9999944449

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The only composite-digit prime formed by inserting between the digits of a double-digit prime p, (i.e., p=89), a concatenation of composite digits using d times each digit d. [Loungrides]

Submitted: 2020-12-26 06:12:50; Last Modified: 2020-12-27 18:10:57.