666666555557777777

This number is a prime.

                                                         66666655 5557777777

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The largest of three primes each consisting of three successive self-repeated digits. The previous such primes are: 223331 and 224444333. [Loungrides]

Submitted: 2017-01-28 13:55:25;   Last Modified: 2018-04-23 05:43:44.
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