251

This number is a prime.

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251 is the smallest prime number that can be added to a 5-digit number with unique digits to produce a 5-digit number made of the other 5 digits: 39875 + 251 = 40126. [Gaydos]

The smallest positive number for p1^3 + p2^3 - p3^3 when p1, p2, and p3 are three consecutive primes (13,17,19). [Gaydos]