18731

This number is a prime.

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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]

Submitted: 2026-06-17 02:38:53; Last Modified: 2026-06-17 03:18:15.