OFFSET
1,3
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..9089, covering range R^2 <= 100.
Hugo Pfoertner, Circles Passing through 3 Points of the Square Lattice, illustrations up to R^2=10.
EXAMPLE
The smallest triangle of lattice points {(0,0),(1,0),(0,1)} has circumradius R=sqrt(2)/2, i.e., R^2=1/2. Therefore a(1)=1, A192494(1)=2.
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Hugo Pfoertner, Jul 10 2011
STATUS
approved