A361623 -id:A361623 - cp's OEIS frontend

A361622 Number of distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

13, 46, 99, 164, 257, 370, 503, 648, 821, 1014, 1227, 1444, 1697, 1970, 2255

Offset: 1

Scott R. Shannon, Mar 18 2023

A circle is constructed for every pair of the 1 + 4n points, the first point defines the circle's center while the second the radius distance.
No formula for a(n) is known.
See A354605 and A353782 for images of the resulting vertices and regions.

Cf. A354605 (vertices), A353782 (regions), A356358 (edges), A361623 (k-gons)

A353782 Number of regions among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

Original entry on oeis.org

112, 1264, 5548, 14976, 37092, 77096, 143560, 237504

Offset: 1

Scott R. Shannon, Mar 13 2023

A circle is constructed for every pair of the 1 + 4n points, the first point defines the circle's center while the second the radius distance. The number of distinct circles constructed from the points is A361622(n).

No formula for a(n) is currently known.

Scott R. Shannon, Image for n = 1.
Scott R. Shannon, Image for n = 2.
Scott R. Shannon, Image for n = 3.
Scott R. Shannon, Image for n = 4.

Cf. A354605 (vertices), A356358 (edges), A361623 (k-gons), A361622 (distinct circles), A359933, A359860, A359253, A359570, A359046.

a(n) = A356358 - A354605(n) + 1 by Euler's formula.

A354605 Number of vertices among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

Original entry on oeis.org

101, 1145, 5001, 13753, 34497, 72185, 135157, 224321

Offset: 1

Scott R. Shannon, Mar 13 2023

A circle is constructed for every pair of the 1 + 4n points, the first point defines the circle's center while the second the radius distance. The number of distinct circles constructed from the points is A361622(n).

No formula for a(n) is currently known.

Scott R. Shannon, Image for n = 1.
Scott R. Shannon, Image for n = 2.
Scott R. Shannon, Image for n = 3.

Cf. A353782 (regions), A356358 (edges), A361623 (k-gons), A361622 (distinct circles), A359932, A359859, A359252, A359569, A331702.

a(n) = A356358 - A353782(n) + 1 by Euler's formula.

A356358 Number of edges among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

Original entry on oeis.org

212, 2408, 10548, 28728, 71588, 149280, 278716, 461824

Offset: 1

Scott R. Shannon, Mar 13 2023

A circle is constructed for every pair of the 1 + 4n points, the first point defines the circle's center while the second the radius distance. The number of distinct circles constructed from the points is A361622(n).
No formula for a(n) is known.
See A354605 and A353782 for images of the vertices and regions.

Cf. A354605 (vertices), A353782 (regions), A361623 (k-gons), A361622 (distinct circles), A359934, A359861, A359254, A359571, A359047.

a(n) = A353782(n) + A354605(n) - 1 by Euler's formula.

A372617 Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass.

Original entry on oeis.org

0, 7, 3, 70, 45, 3, 6, 312, 273, 33, 6, 1017, 1119, 186, 36, 3, 0, 1, 6, 2943, 4092, 702, 150, 15, 3, 1, 6, 6210, 8556, 1941, 351, 45, 3, 3, 6, 12946, 20034, 4632, 735, 99, 9, 6, 20925, 32685, 7944, 1435, 162, 27, 18, 37704, 59520, 15375, 2589, 324, 84, 30, 55326, 87138, 22626, 4456, 474, 96, 3

Offset: 0

Scott R. Shannon, May 07 2024

A circle is constructed for every pair of the 3 + 3*n points, the first point defines the circle's center while the second the radius distance.

See A372614 and A372615 for images of the circles.

			The table begins:
0, 7;
3, 70, 45, 3;
6, 312, 273, 33;
6, 1017, 1119, 186, 36, 3, 0, 1;
6, 2943, 4092, 702, 150, 15, 3, 1;
6, 6210, 8556, 1941, 351, 45, 3, 3;
6, 12946, 20034, 4632, 735, 99, 9;
6, 20925, 32685, 7944, 1435, 162, 27;
18, 37704, 59520, 15375, 2589, 324, 84;
30, 55326, 87138, 22626, 4456, 474, 96, 3;
30, 91923, 146121, 38817, 7777, 894, 135, 9, 9;
36, 118734, 189804, 51747, 10356, 1122, 183;
36, 185730, 299571, 84285, 16015, 2139, 261, 3, 3;
.
.

Cf. A372614 (vertices), A372615 (regions), A372616 (edges), A372682 (number of circles), A371376, A361623, A360354.

Sum of row n = A372615(n).

A362236 Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes when each pair of points is connected by a circle and where the points lie at the ends of the circles' diameter.

Original entry on oeis.org

12, 12, 8, 32, 204, 120, 16, 56, 928, 652, 156, 4, 8, 72, 2724, 2332, 504, 120, 16, 4, 96, 6416, 6120, 1648, 352, 20, 8, 128, 13356, 12444, 4156, 668, 52, 12, 208, 24348, 23892, 8148, 1488, 124, 24, 248, 41268, 41528, 14108, 2616, 276, 36, 336, 65684, 67272, 23372, 4592, 388, 52, 0, 4

Offset: 1

Scott R. Shannon, Apr 13 2023

A circle is constructed for every pair of the 1 + 4n points, the two points lying at the ends of a diameter of the circle. The number of distinct circles constructed from the points is A139275(n).

See A362233 and A362234 for images of the circles.

			The table begins:
 12, 12, 8;
 32, 204, 120, 16;
 56, 928, 652, 156, 4, 8;
 72, 2724, 2332, 504, 120, 16, 4;
 96, 6416, 6120, 1648, 352, 20, 8;
 128, 13356, 12444, 4156, 668, 52, 12;
 208, 24348, 23892, 8148, 1488, 124, 24;
 248, 41268, 41528, 14108, 2616, 276, 36;
 336, 65684, 67272, 23372, 4592, 388, 52, 0, 4;
 384, 99440, 105260, 36028, 7316, 708, 60, 4;
 464, 144684, 156976, 54136, 10792, 1224, 100, 8;
 .
 .

Cf. A362233 (vertices), A362234 (regions), A362235 (edges), A139275 (distinct circles), A361623, A359935.

Sum of row n = A362234(n).

A372734 Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3n points placed on the sides of an equilateral triangle when every pair of the 3 + 3n points are connected by a circle and where the points lie at the ends of the circle's diameter.

Original entry on oeis.org

0, 7, 12, 61, 9, 6, 6, 303, 108, 9, 9, 3, 18, 771, 603, 150, 15, 9, 0, 1, 24, 1722, 1740, 339, 81, 3, 0, 1, 30, 3789, 4326, 1104, 234, 18, 3, 36, 6907, 8274, 2193, 432, 45, 18, 66, 12012, 15504, 4173, 922, 105, 45, 3, 3, 90, 19860, 24774, 7389, 1773, 150, 30, 48, 30594, 39852, 12438, 2998, 387, 48

Offset: 0

Scott R. Shannon, May 12 2024

A circle is constructed for every pair of the 3 + 3*n points, the two points lying at the ends of a diameter of the circle.

See A372731 and A372732 for images of the circles.

			The table begins:
0, 7;
12, 61, 9, 6;
6, 303, 108, 9, 9, 3;
18, 771, 603, 150, 15, 9, 0, 1;
24, 1722, 1740, 339, 81, 3, 0, 1;
30, 3789, 4326, 1104, 234, 18, 3;
36, 6907, 8274, 2193, 432, 45, 18;
66, 12012, 15504, 4173, 922, 105, 45, 3, 3;
90, 19860, 24774, 7389, 1773, 150, 30;
48, 30594, 39852, 12438, 2998, 387, 48;
96, 45456, 59019, 18669, 4429, 609, 93, 3, 6;
90, 66633, 86088, 29136, 6840, 1164, 195, 6;
120, 90210, 121614, 40035, 9160, 1362, 177, 12, 9;
108, 124245, 167646, 57048, 14377, 1989, 300, 33, 15;
.
.

Cf. A372731 (vertices), A372732 (regions), A372733 (edges), A372735 (number of circles), A372617, A371376, A361623, A360354.

Sum of row(n) = A372732(n).

A372980 Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, among all distinct circles that can be constructed from the 4 vertices and the equally spaced 4*n points placed on the sides of a square, using only a compass.

Original entry on oeis.org

16, 29, 272, 260, 80, 12, 4, 1708, 2253, 528, 120, 20, 4, 5200, 7636, 2136, 432, 44, 20, 8, 13732, 20788, 5712, 1120, 184, 17, 8, 31576, 49284, 14060, 3180, 584, 108, 16, 64748, 103557, 30372, 6472, 980, 172, 4, 12, 103368, 166804, 49920, 11196, 1660, 260, 48, 16, 181376, 296388, 88916, 19844, 3128, 445, 64, 20

Offset: 0

Scott R. Shannon, May 19 2024

A circle is constructed for every pair of the 4 + 4*n points, the first point defines the circle's center while the second the radius distance.
Unlike A372617, a similar sequence but with vertices on an equilateral triangle, for the terms studied no graph has 2-edged regions.
See A372977 and A372978 for images of the circles.

			The table begins:
16, 29;
272, 260, 80, 12, 4;
1708, 2253, 528, 120, 20, 4;
5200, 7636, 2136, 432, 44, 20, 8;
13732, 20788, 5712, 1120, 184, 17, 8;
31576, 49284, 14060, 3180, 584, 108, 16;
64748, 103557, 30372, 6472, 980, 172, 4, 12;
103368, 166804, 49920, 11196, 1660, 260, 48, 16;
181376, 296388, 88916, 19844, 3128, 445, 64, 20;
.
.

Cf. A372977 (vertices), A372978 (regions), A372979 (edges), A372981 (circles), A372617, A371376, A361623, A360354.

Sum of row n = A372978(n).

cp's OEIS Frontend

A361622 Number of distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

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A353782 Number of regions among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

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A354605 Number of vertices among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

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A356358 Number of edges among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass.

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A372617 Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass.

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A372980 Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, among all distinct circles that can be constructed from the 4 vertices and the equally spaced 4*n points placed on the sides of a square, using only a compass.

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