A216325 - cp's OEIS frontend

A216325 Number of divisors of the degree of the minimal polynomial for 2*cos(Pi/n), n >= 1.

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

[1, 1, 1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 2, 4, 4, 6, 3, 6, 4, 4, 4, 5, 4, 5, 6, 6, 6, 6, 6, 5, 6, 6, 4, 6, 6, 4, 2, 5, 4, 6, 5, 8, 4, 6, 6, 8, 6, 6, 2, 5, 8, 8, 6, 6, 8, 6, 4, 6, 4, 8, 4, 8, 9, 9, 6, 9, 8, 8, 4, 6, 4, 8, 2, 8, 6, 8, 6, 8, 6, 8, 9, 6, 8, 4, 9, 6, 10, 8]

cp's OEIS Frontend

A216325 Number of divisors of the degree of the minimal polynomial for 2*cos(Pi/n), n >= 1.

Table of values

List of values

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

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

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