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The larger of the only two primes resulting from
concatenation of two twodigit primes, each of them formed
from two consecutive digits. [Silva]
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]
(There is one curio for this number that has not yet been approved by an editor.)
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