A346725 - cp's OEIS frontend

A346725 Use the cells of a hexagonal grid to represent the algebraic integers in the integer ring of Q(sqrt(-67)) as explained in the comments. Number the cells along the counterclockwise hexagonal spiral that starts with cells 0 and 1 representing integers 0 and 1. List the cells that represent 0 or a prime in the ring.

n	a(n)
1	0
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	15
13	17
14	19
15	20
16	21
17	22
18	23
19	25
20	26
21	28
22	29
23	30
24	31
25	32
26	34
27	35
28	37
29	39
30	41
31	43
32	45
33	47
34	49
35	51
36	53
37	55
38	57
39	59
40	61
41	62
42	63
43	64
44	65
45	66
46	67
47	68
48	69
49	71
50	72
51	73
52	74
53	76
54	77
55	78
56	79
57	80
58	81
59	82
60	83
61	84
62	86
63	87
64	88
65	89
66	91
67	95
68	97
69	101
70	103
71	107
72	109

[0, 2, 3, 5, 6, 7, 8, 9, 11, 13, 14, 15, 17, 19, 20, 21, 22, 23, 25, 26, 28, 29, 30, 31, 32, 34, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 91, 95, 97, 101, 103, 107, 109]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	15
13	17
14	19
15	20
16	21
17	22
18	23
19	25
20	26
21	28
22	29
23	30
24	31
25	32
26	34
27	35
28	37
29	39
30	41
31	43
32	45
33	47
34	49
35	51
36	53
37	55
38	57
39	59
40	61
41	62
42	63
43	64
44	65
45	66
46	67
47	68
48	69
49	71
50	72
51	73
52	74
53	76
54	77
55	78
56	79
57	80
58	81
59	82
60	83
61	84
62	86
63	87
64	88
65	89
66	91
67	95
68	97
69	101
70	103
71	107
72	109

n	a(n)
1	0
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	15
13	17
14	19
15	20
16	21
17	22
18	23
19	25
20	26
21	28
22	29
23	30
24	31
25	32
26	34
27	35
28	37
29	39
30	41
31	43
32	45
33	47
34	49
35	51
36	53
37	55
38	57
39	59
40	61
41	62
42	63
43	64
44	65
45	66
46	67
47	68
48	69
49	71
50	72
51	73
52	74
53	76
54	77
55	78
56	79
57	80
58	81
59	82
60	83
61	84
62	86
63	87
64	88
65	89
66	91
67	95
68	97
69	101
70	103
71	107
72	109

n	a(n)
1	0
2	2
3	3
4	5
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	15
13	17
14	19
15	20
16	21
17	22
18	23
19	25
20	26
21	28
22	29
23	30
24	31
25	32
26	34
27	35
28	37
29	39
30	41
31	43
32	45
33	47
34	49
35	51
36	53
37	55
38	57
39	59
40	61
41	62
42	63
43	64
44	65
45	66
46	67
47	68
48	69
49	71
50	72
51	73
52	74
53	76
54	77
55	78
56	79
57	80
58	81
59	82
60	83
61	84
62	86
63	87
64	88
65	89
66	91
67	95
68	97
69	101
70	103
71	107
72	109