18731

This number is a prime.

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

The largest prime in the smallest 3x3 magic square of emirps:

17207 18731 16493
16763 17477 18191
18461 16223 17747

Note that the magic constant is 52431, a number with digits 1-5 exactly once. [Gudipati]