A362873 - cp's OEIS frontend

A362873 a(n) is the number of points with integer coordinates that are inside an equilateral triangle inscribed in a circle of radius n, the location of the triangle in the Oxy coordinate plane is described in the comments.

n	a(n)
1	1
2	4
3	12
4	17
5	33
6	42
7	64
8	77
9	105
10	122
11	158
12	177
13	219
14	242
15	292
16	319
17	375
18	406
19	470
20	503
21	573
22	610
23	688
24	729
25	813
26	856
27	948
28	995
29	1093
30	1144
31	1248
32	1303
33	1415
34	1472
35	1592
36	1653
37	1779
38	1844
39	1976
40	2045
41	2185
42	2256
43	2402
44	2477
45	2631
46	2710
47	2870
48	2951
49	3119
50	3204
51	3378
52	3467
53	3649

[1, 4, 12, 17, 33, 42, 64, 77, 105, 122, 158, 177, 219, 242, 292, 319, 375, 406, 470, 503, 573, 610, 688, 729, 813, 856, 948, 995, 1093, 1144, 1248, 1303, 1415, 1472, 1592, 1653, 1779, 1844, 1976, 2045, 2185, 2256, 2402, 2477, 2631, 2710, 2870, 2951, 3119, 3204, 3378, 3467, 3649]

cp's OEIS Frontend

A362873 a(n) is the number of points with integer coordinates that are inside an equilateral triangle inscribed in a circle of radius n, the location of the triangle in the Oxy coordinate plane is described in the comments.

Table of values

List of values