A267803 - cp's OEIS frontend

A267803 Number of unit hexagonal lattice cells (hexagon in the origin) enclosed by origin centered circle of radius n.

n	a(n)
1	1
2	1
3	7
4	13
5	19
6	31
7	43
8	61
9	85
10	97
11	121
12	151
13	175
14	211
15	241
16	271
17	313
18	349
19	385
20	439
21	499
22	535
23	583
24	649
25	691
26	757
27	823
28	877
29	955
30	1027
31	1087
32	1159
33	1249
34	1321
35	1401
36	1483
37	1561
38	1663
39	1765
40	1827
41	1945
42	2053
43	2133
44	2233
45	2347
46	2443
47	2563
48	2677
49	2779
50	2905

[1, 1, 7, 13, 19, 31, 43, 61, 85, 97, 121, 151, 175, 211, 241, 271, 313, 349, 385, 439, 499, 535, 583, 649, 691, 757, 823, 877, 955, 1027, 1087, 1159, 1249, 1321, 1401, 1483, 1561, 1663, 1765, 1827, 1945, 2053, 2133, 2233, 2347, 2443, 2563, 2677, 2779, 2905]

cp's OEIS Frontend

A267803 Number of unit hexagonal lattice cells (hexagon in the origin) enclosed by origin centered circle of radius n.

Table of values

List of values