139

This number is a prime.

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2^1 + 2^3 + 2^9 +/- 1 and 2^1 + 2^3 + 2^9 + 139^2 are all prime. [Homewood]

Submitted: 2018-05-05 13:38:58;   Last Modified: 2018-05-05 14:29:23.
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