|
Search: id:A141249
|
|
|
| A141249 |
|
Numbers n such that the central point of the square n X n lattice sees the minimal number of points. |
|
+0
3
|
|
| 1, 21, 33, 45, 73, 81, 193, 201, 241, 273, 313, 381, 421, 445, 453, 661, 693, 861, 885, 913
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
These n are the numbers for which A141248(n) is odd. Note that n must be odd. When A141248(n)=1, the central point is the only point seeing the minimal number of points. These numbers are 1 or 9 (mod 12). These numbers also seem to produce cubic n X n X n lattices in which the central point has minimal visibility. Note that for n>1, n+1 is twice a prime power in A141250.
|
|
CROSSREFS
|
Cf. A141226.
Sequence in context: A075110 A036382 A119973 this_sequence A026068 A070006 A084109
Adjacent sequences: A141246 A141247 A141248 this_sequence A141250 A141251 A141252
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
T. D. Noe (noe(AT)sspectra.com), Jun 17 2008
|
|
|
Search completed in 0.005 seconds
|
