3,2

I do not know which of these values have been proved to be minimal.

Turning over is allowed. The pieces must be bounded by simple curves to avoid difficulties with non-measurable sets.

See A110312 for further references and illustrations.

G. N. Frederickson, Dissections: Plane and Fancy, Cambridge, 1997.

Table of n, a(n) for n=3..12.

Array begins:

1 4 6 5 8 7 ... <= A110000

4 1 6 5 7 5 9 ... <= A110312

6 6 1 7 ...

5 5 7 1 ...

8 7 ...

...

Row 3 gives A110000, row 4 gives A110312.

Sequence in context: A142154 A084458 A248933 * A200348 A205868 A156583

Adjacent sequences: A110353 A110354 A110355 * A110357 A110358 A110359

nonn,tabl

N. J. A. Sloane, Sep 11 2005

approved