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+ The larger of the only two primes resulting from concatenation of two two-digit 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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