A357021 - cp's OEIS frontend

A357021 First coordinate x of points in the triangular lattice, sorted first by the distance from the origin and then by the circumferential angle phi restricted to the sector 0 <= phi < Pi/6. y is given in A357022.

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	8
21	7
22	8
23	8
24	8
25	9
26	9
27	8
28	9
29	9
30	10
31	10
32	10
33	9
34	10
35	10
36	11
37	11
38	11
39	10
40	11
41	12
42	12
43	11
44	12
45	12
46	11
47	12
48	13
49	13
50	12
51	13
52	13
53	12
54	13
55	14
56	14
57	14
58	14
59	13
60	14
61	13
62	15
63	15
64	14
65	15
66	15
67	14
68	15
69	16
70	16
71	14
72	16
73	15

[0, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 7, 8, 8, 8, 9, 9, 8, 9, 9, 10, 10, 10, 9, 10, 10, 11, 11, 11, 10, 11, 12, 12, 11, 12, 12, 11, 12, 13, 13, 12, 13, 13, 12, 13, 14, 14, 14, 14, 13, 14, 13, 15, 15, 14, 15, 15, 14, 15, 16, 16, 14, 16, 15]

cp's OEIS Frontend

A357021 First coordinate x of points in the triangular lattice, sorted first by the distance from the origin and then by the circumferential angle phi restricted to the sector 0 <= phi < Pi/6. y is given in A357022.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	8
21	7
22	8
23	8
24	8
25	9
26	9
27	8
28	9
29	9
30	10
31	10
32	10
33	9
34	10
35	10
36	11
37	11
38	11
39	10
40	11
41	12
42	12
43	11
44	12
45	12
46	11
47	12
48	13
49	13
50	12
51	13
52	13
53	12
54	13
55	14
56	14
57	14
58	14
59	13
60	14
61	13
62	15
63	15
64	14
65	15
66	15
67	14
68	15
69	16
70	16
71	14
72	16
73	15

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	8
21	7
22	8
23	8
24	8
25	9
26	9
27	8
28	9
29	9
30	10
31	10
32	10
33	9
34	10
35	10
36	11
37	11
38	11
39	10
40	11
41	12
42	12
43	11
44	12
45	12
46	11
47	12
48	13
49	13
50	12
51	13
52	13
53	12
54	13
55	14
56	14
57	14
58	14
59	13
60	14
61	13
62	15
63	15
64	14
65	15
66	15
67	14
68	15
69	16
70	16
71	14
72	16
73	15

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	8
21	7
22	8
23	8
24	8
25	9
26	9
27	8
28	9
29	9
30	10
31	10
32	10
33	9
34	10
35	10
36	11
37	11
38	11
39	10
40	11
41	12
42	12
43	11
44	12
45	12
46	11
47	12
48	13
49	13
50	12
51	13
52	13
53	12
54	13
55	14
56	14
57	14
58	14
59	13
60	14
61	13
62	15
63	15
64	14
65	15
66	15
67	14
68	15
69	16
70	16
71	14
72	16
73	15