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A141226 Numbers n such that the central point of the square n x n lattice sees the maximal number of points. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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.

LINKS

Table of n, a(n) for n=1..27.

CROSSREFS

Sequence in context: A177789 A289526 A289765 * A049491 A000355 A163769

Adjacent sequences:  A141223 A141224 A141225 * A141227 A141228 A141229

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)