463

This number is a prime.

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The smallest prime that is a sum of mountain primes, i.e., 463 = 131 + 151 + 181. [Loungrides]

The only distinct-digit 3-digit prime which remains a prime after a prime digit is subtracted from any of its digits or from all of its digits simultaneously, i.e., 263, 443, 461, 241. [Loungrides]