This number is a prime.

                                                               75 7777777777

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The smaller of only two near-repdigit prime-digit primes with length (p+q) using the largest two prime digits p, q. The other one is 777775777777. [Loungrides]

Submitted: 2012-01-21 11:48:55;   Last Modified: 2020-05-15 13:06:54.
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