137

This number is a prime.

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The smallest prime that can be represented as sum of products of n pairs of first consecutive odd numbers, (n=3), i.e., 1*3 + 5*7 + 9*11. Can you find the 2nd such prime? [Loungrides]

The only 3-digit distinct-odd-digit prime which remains prime when 2 is added to any of its digits, i.e., 139, 157, 337. Note also that adding 2 to all of its digits we have an emirp, i.e., 359. [Loungrides]

137 is the only 3-digit prime that divides all of the numbers of form aaaaabbaabbaaaaa. [Loungrides]