A216326 - cp's OEIS frontend

A216326 Number of divisors of the degree of the minimal polynomial of 2*cos(Pi/prime(n)), with prime = A000040, n >= 1.

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

[1, 1, 2, 2, 2, 4, 4, 3, 2, 4, 4, 6, 6, 4, 2, 4, 2, 8, 4, 4, 9, 4, 2, 6, 10, 6, 4, 2, 8, 8, 6, 4, 6, 4, 4, 6, 8, 5, 2, 4, 2, 12, 4, 12, 6, 6, 8, 4, 2, 8, 6, 4, 16, 4, 8, 2, 4, 8, 8, 12, 4, 4, 6, 4, 12, 4, 8, 16, 2, 8, 10, 2, 4, 8, 8, 2, 4, 12, 12, 12, 4, 16, 4, 16, 4, 4, 12, 12, 8, 8, 2]

cp's OEIS Frontend

A216326 Number of divisors of the degree of the minimal polynomial of 2*cos(Pi/prime(n)), with prime = A000040, n >= 1.

Table of values

List of values

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

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

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