3719
This number is a prime.
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There are are 3719 different ways to arrange the set of
twelve pentominoes into a rectangle (6-by-10, 5-by-12,
4-by-15, or 3-by-20), counting up to rotations and
reflections. [Nie]
Submitted: 2023-11-05 21:33:01; Last Modified: 2023-11-05 22:06:17.
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