33444...99999 (38-digits)

This number is a prime.

33444455 5556666667 7777778888 8888999999

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The longest prime substring in 1 one, 2 twos, ..., 8 eights, and 9 nines. [Gaydos]

Submitted: 2017-12-23 15:16:33; Last Modified: 2017-12-23 17:58:40.