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A192494 Denominators of squared radii of circumcircles of non-degenerate triangles with integer vertex coordinates. 7
2, 1, 4, 18, 16, 1, 2, 9, 8, 4, 98, 50, 18, 1, 16, 4, 98, 50, 2, 64, 242, 36, 18, 1, 64, 16, 9, 196, 50, 4, 338, 98, 2, 49, 64, 242, 25, 162, 18, 9, 4, 338, 578, 256, 98, 50, 324, 722, 242, 16, 1, 18, 8, 100, 2, 98, 98, 49, 242, 25, 722, 1058, 1, 36, 32, 16, 121, 4, 578, 338, 18, 256, 98, 9, 144, 484, 50, 64, 50, 242, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Hugo Pfoertner, Table of n, a(n) for n = 1..9089, covering range R^2 <= 100.

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 A192493(1)=1, a(1)=2.

CROSSREFS

Cf. A192493 (corresponding numerators).

Sequence in context: A025228 A267377 A132945 * A013156 A012925 A012930

Adjacent sequences:  A192491 A192492 A192493 * A192495 A192496 A192497

KEYWORD

nonn,frac

AUTHOR

Hugo Pfoertner, Jul 10 2011

STATUS

approved

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Last modified July 10 13:04 EDT 2020. Contains 335576 sequences. (Running on oeis4.)