773

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In binary 11011 + 2, 110011 + 2, 1100011 + 2, 11000011 + 2, 110000011 + 2 and 1100000011 + 2 are all prime, this one being the largest. Note that all the primes are full reptend primes in binary. [Homewood]

Submitted: 2018-05-14 11:53:08;   Last Modified: 2018-05-14 13:51:50.
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