223

This number is a prime.

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The smallest prime that has more primitive roots below p/2 than above p/2. [Gudipati]

The smallest number whose decimal encoding of its prime factorization is same as that of a smaller number, i.e., 223 = 223¹ (decimal encoding is 2231) and 12 = 2²3¹ (decimal encoding is 2231). [Gudipati]