A053416 - cp's OEIS frontend

A053416 Circle numbers (version 4): a(n)= number of points (i+j/2,j*sqrt(3)/2), i,j integers (triangular grid) contained in a circle of diameter n, centered at (0,0).

n	a(n)
0	1
1	1
2	7
3	7
4	19
5	19
6	37
7	43
8	61
9	73
10	91
11	109
12	127
13	151
14	187
15	199
16	241
17	253
18	301
19	313
20	367
21	397
22	439
23	475
24	517
25	571
26	613
27	661
28	721
29	757
30	823
31	859
32	931
33	979
34	1045
35	1111
36	1165
37	1237
38	1303
39	1381
40	1459
41	1519
42	1615
43	1663
44	1765
45	1813
46	1921
47	1993
48	2083
49	2173
50	2263

[1, 1, 7, 7, 19, 19, 37, 43, 61, 73, 91, 109, 127, 151, 187, 199, 241, 253, 301, 313, 367, 397, 439, 475, 517, 571, 613, 661, 721, 757, 823, 859, 931, 979, 1045, 1111, 1165, 1237, 1303, 1381, 1459, 1519, 1615, 1663, 1765, 1813, 1921, 1993, 2083, 2173, 2263]

cp's OEIS Frontend

A053416 Circle numbers (version 4): a(n)= number of points (i+j/2,j*sqrt(3)/2), i,j integers (triangular grid) contained in a circle of diameter n, centered at (0,0).

Table of values

List of values