8923
This number is a prime.
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The least prime p such that for all 2^k < p the numbers
p + 2^k, p - 2^k, p*2^k + 1, and p*2^k - 1 are composite. [Wesolowski]
Submitted: 2015-03-20 13:11:15; Last Modified: 2015-03-20 17:16:46.
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