- are 760
fixed heptominoes. The
figure shows all
possible free
heptominoes,
coloured according to
their symmetry groups: 84
heptominoes (coloured grey)...
- the
previous number by a
triangular number.
There are 196 one-sided
heptominoes, the
polyominoes made from 7 squares. Here, one-sided
means that asymmetric...
-
noted in 1965 that all
polyominoes up to
hexominoes and all but four
heptominoes tile the plane. It was then
established by
David Bird that all but 26...
- for q=3 760 = 23 × 5 × 19,
centered triangular number,
number of
fixed heptominoes. 761 =
prime number, emirp,
Sophie Germain prime, Chen prime, Eisenstein...
-
while trying to find an
efficient way to
determine which of the 108
heptominoes tile the plane. In its
simplest form, the
criterion simply states that...
- unsolved, may have b = 15 and m = 13): The
first player cannot win All
heptominoes and above: The
first player cannot win Tic-tac-toe QBF
Encoding of Generalized...
