27777...77777 (37-digits)

This number is a prime.

2777777 7777777777 7777777777 7777777777

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The first member of an easy-to-remember twin prime of the form 2(7)_k. [de Groot]

Submitted: 2006-07-30 11:59:38; Last Modified: 2008-01-30 17:28:00.