109

This number is a prime.

Just showing those entries submitted by 'Loungrides': (Click here to show all)

+ The sum of the reversals of any two double-digit numbers summed to a hundred. [Loungrides]

+ The smallest prime concatenated from two successive numbers, (9, 10), that are sides in an equable triangle. (A shape is called equable if its area equals its perimeter). The triangle is (9, 10, 17). [Loungrides]

(There are 4 curios for this number that have not yet been approved by an editor.)

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