A141226 Numbers n such that the central point of the square n x n lattice sees the maximal number of points.

1, 3, 11, 23, 27, 35, 39, 47, 59, 95, 147, 167, 179, 207, 219, 227, 279, 347, 363, 399, 543, 567, 587, 627, 767, 779, 935

Offset: 1

Author

T. D. Noe, Jun 15 2008, Jun 17 2008

Keywords

• nonn

Comments

These n are the numbers for which A141225(n) is odd. Note that n must be odd. When A141225(n)=1, the central point is the only point seeing the maximal number of points. Except for 1, these numbers are 3 or 11 (mod 12).

These numbers also seem to produce cubic n x n x n lattices in which the central point has maximal visibility; see A141228. Note that for n>3, n-1 is twice a prime in A141246.