A303706 - cp's OEIS frontend

A303706 a(n) is the number of lattice points in a Cartesian grid between an equilateral triangle and an inscribed circle of radius n; one of the side of triangle is perpendicular to the X-axis; the circle's center is at the origin.

n	a(n)
1	0
2	5
3	14
4	29
5	42
6	65
7	94
8	123
9	154
10	187
11	234
12	289
13	328
14	383
15	436
16	507
17	572
18	645
19	716
20	789
21	884
22	961
23	1058
24	1159
25	1244
26	1347
27	1454
28	1573
29	1692
30	1805
31	1940
32	2057
33	2194
34	2325
35	2454
36	2621
37	2758
38	2927
39	3060
40	3221
41	3404
42	3571
43	3746
44	3909
45	4086
46	4293
47	4478
48	4677
49	4868
50	5061
51	5256
52	5465
53	5698
54	5915

[0, 5, 14, 29, 42, 65, 94, 123, 154, 187, 234, 289, 328, 383, 436, 507, 572, 645, 716, 789, 884, 961, 1058, 1159, 1244, 1347, 1454, 1573, 1692, 1805, 1940, 2057, 2194, 2325, 2454, 2621, 2758, 2927, 3060, 3221, 3404, 3571, 3746, 3909, 4086, 4293, 4478, 4677, 4868, 5061, 5256, 5465, 5698, 5915]

cp's OEIS Frontend

A303706 a(n) is the number of lattice points in a Cartesian grid between an equilateral triangle and an inscribed circle of radius n; one of the side of triangle is perpendicular to the X-axis; the circle's center is at the origin.

Table of values

List of values