173

This number is a prime.

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173 divides 179*181*191+1. Are there four larger consecutive primes p < q < r < s such that p|qrs + 1? [Loungrides]

The first 3-digit prime that is the last prime in a set of five primes in arithmetic progression, i.e., 173, 131, 89, 47, 5. [Loungrides]

The smallest prime that is the reverse of (a^b+c^d), where a, b, c, d are the prime digits, i.e., 173=R(2^7+3^5). [Loungrides]