A003215 - cp's OEIS frontend

A003215 Hex (or centered hexagonal) numbers: 3n(n+1)+1 (crystal ball sequence for hexagonal lattice).

n	a(n)
0	1
1	7
2	19
3	37
4	61
5	91
6	127
7	169
8	217
9	271
10	331
11	397
12	469
13	547
14	631
15	721
16	817
17	919
18	1027
19	1141
20	1261
21	1387
22	1519
23	1657
24	1801
25	1951
26	2107
27	2269
28	2437
29	2611
30	2791
31	2977
32	3169
33	3367
34	3571
35	3781
36	3997
37	4219
38	4447
39	4681
40	4921
41	5167
42	5419
43	5677
44	5941
45	6211
46	6487
47	6769

[1, 7, 19, 37, 61, 91, 127, 169, 217, 271, 331, 397, 469, 547, 631, 721, 817, 919, 1027, 1141, 1261, 1387, 1519, 1657, 1801, 1951, 2107, 2269, 2437, 2611, 2791, 2977, 3169, 3367, 3571, 3781, 3997, 4219, 4447, 4681, 4921, 5167, 5419, 5677, 5941, 6211, 6487, 6769]

cp's OEIS Frontend

A003215 Hex (or centered hexagonal) numbers: 3n(n+1)+1 (crystal ball sequence for hexagonal lattice).

Table of values

List of values

cp's OEIS Frontend

A003215 Hex (or centered hexagonal) numbers: 3*n*(n+1)+1 (crystal ball sequence for hexagonal lattice).

Table of values

List of values

A003215 Hex (or centered hexagonal) numbers: 3n(n+1)+1 (crystal ball sequence for hexagonal lattice).