A251632 - OEIS

A251632

Circular disk sequence for the lattice of the Archimedean tiling (4,8,8).

1, 4, 5, 9, 15, 17, 19, 23, 28, 32, 33, 39, 41, 45, 47, 51, 53, 55, 59, 67, 71, 75, 78, 80, 82, 83, 85, 89, 93, 95, 99, 103, 107, 115, 117, 119, 121, 129, 133, 135, 137, 141, 143, 147, 149, 150, 154, 158, 160, 161, 169, 173, 177, 179, 183, 185, 187, 191, 193, 195, 199, 203, 205, 207, 211, 213

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OFFSET

0,2

COMMENTS

For the squares of the radii of the lattice point hitting circles of the Archimedean tiling (4,8,8) see A251629 and A251631.

The first differences for this sequence are given in A251633.

See the link for more details.

LINKS

Table of n, a(n) for n=0..65.

Wolfdieter Lang, On lattice point circles for the Archimedean tiling (4,8,8).

Wikipedia, Archimedean tilings

FORMULA

a(n) is the number of lattice points of the Archimedean tiling (4,8,8) on the boundary and the interior of the circular disk belonging to the radius R(n) = sqrt(A251629(n) + A251631(n)*sqrt(2)), for n >= 0.

EXAMPLE

n=4: The radius of the disk is R(4) = sqrt(3 + 2*sqrt(2)), approximately 2.4142. The lattice points for this R(4)-disk are the origin, three points on the circle with radius R(1) = 1, one point on the circle with radius R(2) = sqrt(2), four points on the circle with radius R(3) = sqrt(2 + sqrt(2)) and 6 points on the circle with radius R(4) = sqrt(3 + 2*sqrt(2)), all together 1 + 3 + 1 + 4 + 6 = 15 = a(4) lattice points.

CROSSREFS

Cf. A251629, A251631, A251633.

Sequence in context: A041823 A042489 A217685 * A350695 A049860 A010382

Adjacent sequences: A251629 A251630 A251631 * A251633 A251634 A251635

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jan 02 2015

STATUS

approved