Primes of the heptomino

[heptomino]

2 × 7 (smallest rectangle)
11 × 49
13 × 35
19 × 21 (smallest odd rectangle)
complete

smallest rectangle: 2 × 7

[2 x 7 rectangle]


smallest odd rectangle: 19 × 21

[19 x 21 rectangle]

The smallest odd rectangle was given by Marshall [1, Figure 13].

Reference

[1] William Rex Marshall, Packing Rectangles with Congruent Polyominoes, Journal of Combinatorial Theory, Series A 77 (1997), no. 2, pp. 181-192.

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Updated August 25, 2011.