A244209 The total number of unit circles (centered at sites of a square lattice with constant 2) intersecting a circle of radius n centered at (0,0).

0, 8, 4, 12, 12, 16, 16, 32, 20, 28, 28, 40, 32, 40, 44, 48, 52, 68, 52, 56, 56, 72, 60, 68, 76, 88, 80, 88, 84, 84, 84, 112, 92, 112, 104, 112, 116, 116, 116, 112, 112, 144, 140, 140, 132, 144, 136, 144, 148, 168, 148, 164, 164, 160, 160, 184, 164, 172, 180, 200, 176, 192, 204

Offset: 1

Author

Kival Ngaokrajang, Jun 22 2014

Keywords

• nonn

Comments

The intersecting and enclosing case found so far only at n = 2. For the cases of enclosing with and without intersecting the sequence would be A168397(n+1) and A168397(n+2) respectively. The first difference seems to be randomly distributed.

Links

• Kival Ngaokrajang, Illustration of initial terms
• Eric Weisstein's World of Mathematics, Circle-Circle Intersection

Crossrefs

Cf. A168397.

Extensions

Name specified. - Wolfdieter Lang, Jul 07 2014