28999...99999 (30-digits)

This number is a prime.

2899999999 9999999999 9999999999

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The only non-titanic prime formed from a perfect number n followed by n times a digit d., i.e., 28 followed by 28 9’s. [Loungrides]

Submitted: 2012-07-29 14:49:38; Last Modified: 2016-08-15 13:36:55.