1181

This number is a prime.

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The smallest invertible prime p such that placing each digit d from p in the function (2^d + 1) always produces a prime. Note that the concatenation of the four primes thus produced {3||3||257||3} is an emirp. [Bajpai]

Submitted: 2020-04-29 17:31:33; Last Modified: 2020-06-14 17:21:53.