A274821 - cp's OEIS frontend

A274821 Hexagonal spiral constructed on the nodes of the infinite triangular net in which each term is the least positive integer such that no diagonal contains a repeated term.

n	a(n)
0	1
1	2
2	3
3	2
4	3
5	2
6	3
7	1
8	4
9	1
10	5
11	4
12	6
13	4
14	5
15	6
16	4
17	5
18	7
19	6
20	7
21	8
22	5
23	7
24	6
25	8
26	7
27	4
28	1
29	7
30	6
31	8
32	1
33	7
34	8
35	6
36	5
37	9
38	2
39	4
40	7
41	9
42	2
43	10
44	8
45	9
46	3
47	5
48	10
49	9
50	3
51	11
52	12
53	9
54	10
55	11
56	13
57	4
58	9
59	10
60	8
61	11
62	10
63	3
64	5
65	9
66	6
67	11
68	3
69	12
70	10
71	12
72	1
73	11
74	8
75	9
76	7
77	1
78	10
79	8
80	11
81	13
82	8
83	2
84	5
85	9
86	6
87	12
88	2
89	11
90	13
91	10
92	6
93	12
94	11
95	14
96	13
97	12
98	14
99	15

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

cp's OEIS Frontend

A274821 Hexagonal spiral constructed on the nodes of the infinite triangular net in which each term is the least positive integer such that no diagonal contains a repeated term.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	2
4	3
5	2
6	3
7	1
8	4
9	1
10	5
11	4
12	6
13	4
14	5
15	6
16	4
17	5
18	7
19	6
20	7
21	8
22	5
23	7
24	6
25	8
26	7
27	4
28	1
29	7
30	6
31	8
32	1
33	7
34	8
35	6
36	5
37	9
38	2
39	4
40	7
41	9
42	2
43	10
44	8
45	9
46	3
47	5
48	10
49	9
50	3
51	11
52	12
53	9
54	10
55	11
56	13
57	4
58	9
59	10
60	8
61	11
62	10
63	3
64	5
65	9
66	6
67	11
68	3
69	12
70	10
71	12
72	1
73	11
74	8
75	9
76	7
77	1
78	10
79	8
80	11
81	13
82	8
83	2
84	5
85	9
86	6
87	12
88	2
89	11
90	13
91	10
92	6
93	12
94	11
95	14
96	13
97	12
98	14
99	15

n	a(n)
0	1
1	2
2	3
3	2
4	3
5	2
6	3
7	1
8	4
9	1
10	5
11	4
12	6
13	4
14	5
15	6
16	4
17	5
18	7
19	6
20	7
21	8
22	5
23	7
24	6
25	8
26	7
27	4
28	1
29	7
30	6
31	8
32	1
33	7
34	8
35	6
36	5
37	9
38	2
39	4
40	7
41	9
42	2
43	10
44	8
45	9
46	3
47	5
48	10
49	9
50	3
51	11
52	12
53	9
54	10
55	11
56	13
57	4
58	9
59	10
60	8
61	11
62	10
63	3
64	5
65	9
66	6
67	11
68	3
69	12
70	10
71	12
72	1
73	11
74	8
75	9
76	7
77	1
78	10
79	8
80	11
81	13
82	8
83	2
84	5
85	9
86	6
87	12
88	2
89	11
90	13
91	10
92	6
93	12
94	11
95	14
96	13
97	12
98	14
99	15

n	a(n)
0	1
1	2
2	3
3	2
4	3
5	2
6	3
7	1
8	4
9	1
10	5
11	4
12	6
13	4
14	5
15	6
16	4
17	5
18	7
19	6
20	7
21	8
22	5
23	7
24	6
25	8
26	7
27	4
28	1
29	7
30	6
31	8
32	1
33	7
34	8
35	6
36	5
37	9
38	2
39	4
40	7
41	9
42	2
43	10
44	8
45	9
46	3
47	5
48	10
49	9
50	3
51	11
52	12
53	9
54	10
55	11
56	13
57	4
58	9
59	10
60	8
61	11
62	10
63	3
64	5
65	9
66	6
67	11
68	3
69	12
70	10
71	12
72	1
73	11
74	8
75	9
76	7
77	1
78	10
79	8
80	11
81	13
82	8
83	2
84	5
85	9
86	6
87	12
88	2
89	11
90	13
91	10
92	6
93	12
94	11
95	14
96	13
97	12
98	14
99	15