347

This number is a prime.

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There are 347 five-digit Honaker primes. [Gaydos]

The smallest prime number for which the sum of the squares of the digits of its square equals the sum of the squares of the digits of the square of its prime index. [Gaydos]

The smallest prime Yarborough number that has the same sum of digits (14) as its Yarborough indext (158). [Gaydos]