OFFSET
0,2
COMMENTS
Grid points coincident with the outer boundary of the spiral are included.
The spiral figure is closed with a line from (n, 0) to (n-1, 0).
Conjecture: Only lattice points on the positive x-axis are on the outer boundary of the spiral. It seems that the spiral passes all other grid points without hitting any.
LINKS
EXAMPLE
See the PDF in links.
CROSSREFS
KEYWORD
nonn
AUTHOR
Karl-Heinz Hofmann, Jul 16 2022
STATUS
approved