16001

This number is a prime.

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The only prime (bemirp) p of the form p = a^b*c^d+1, where a, b, c, d are the prime digits, i.e., 2^7*5^3+1 = 16001. [Loungrides]

The smallest bemirp de Polignac number. (A de Polygnac number is an odd number n that cannot be expressed as n = 2^k+p, where p is prime). [Loungrides]