A053417 - cp's OEIS frontend

A053417 Circle numbers (version 5): 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 (1/2,0).

n	a(n)
0	0
1	2
2	4
3	10
4	14
5	24
6	30
7	48
8	60
9	76
10	92
11	110
12	130
13	154
14	178
15	208
16	230
17	264
18	288
19	330
20	364
21	406
22	442
23	482
24	522
25	564
26	614
27	664
28	712
29	766
30	812
31	874
32	922
33	990
34	1050
35	1112
36	1176
37	1240
38	1312
39	1382
40	1452
41	1530
42	1598
43	1684
44	1750
45	1840
46	1920
47	2008
48	2092
49	2182
50	2266

[0, 2, 4, 10, 14, 24, 30, 48, 60, 76, 92, 110, 130, 154, 178, 208, 230, 264, 288, 330, 364, 406, 442, 482, 522, 564, 614, 664, 712, 766, 812, 874, 922, 990, 1050, 1112, 1176, 1240, 1312, 1382, 1452, 1530, 1598, 1684, 1750, 1840, 1920, 2008, 2092, 2182, 2266]

cp's OEIS Frontend

A053417 Circle numbers (version 5): 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 (1/2,0).

Table of values

List of values