401

This number is a prime.

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The only 3-digit prime formed by using the squares of first three digits. [Loungrides]

The smallest prime that can be represented as the sum of products of first n pairs of consecutive positive even numbers plus 1, i.e., 2*4+6*8+10*12+14*16+1, (case n=4). [Loungrides]

The smallest of only two 3-digit tetranacci primes. The other is 773. [Loungrides]