33444...99999 (38-digits)

This number is a prime.

                                   33444455 5556666667 7777778888 8888999999

Just showing those entries submitted by 'Gaydos': (Click here to show all)

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

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