A308685 - cp's OEIS frontend

A308685 The number of triangular lattice points whose Euclidean distance from the origin is less than or equal to n.

n	a(n)
0	1
1	7
2	19
3	37
4	61
5	91
6	127
7	187
8	241
9	301
10	367
11	439
12	517
13	613
14	721
15	823
16	931
17	1045
18	1165
19	1303
20	1459
21	1615
22	1765
23	1921
24	2083
25	2263
26	2455
27	2653
28	2857
29	3055
30	3259
31	3481
32	3697
33	3949
34	4195
35	4447
36	4693
37	4957
38	5239
39	5527
40	5815
41	6109
42	6409
43	6715
44	7015
45	7333
46	7681

[1, 7, 19, 37, 61, 91, 127, 187, 241, 301, 367, 439, 517, 613, 721, 823, 931, 1045, 1165, 1303, 1459, 1615, 1765, 1921, 2083, 2263, 2455, 2653, 2857, 3055, 3259, 3481, 3697, 3949, 4195, 4447, 4693, 4957, 5239, 5527, 5815, 6109, 6409, 6715, 7015, 7333, 7681]

cp's OEIS Frontend

A308685 The number of triangular lattice points whose Euclidean distance from the origin is less than or equal to n.

Table of values

List of values