19

This number is a prime.

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If you plot the seven points (2,3), (3,5), (5,7), (7,11), (11,13), (13,17), (17,19) and calculate the area within this irregular non-convex 7-gon, you will get exactly 19. [Rivera]

Submitted: 2020-05-22 14:28:05; Last Modified: 2020-05-22 14:38:07.