A086375 - cp's OEIS frontend

A086375 Number of factors over Q in the factorization of U_n(x) + 1 where U_n(x) is the Chebyshev polynomial of the second kind.

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	4
7	3
8	3
9	3
10	6
11	2
12	4
13	4
14	5
15	4
16	5
17	2
18	7
19	4
20	4
21	4
22	8
23	3
24	4
25	5
26	6
27	4
28	8
29	2
30	8
31	4
32	3
33	6
34	9
35	4
36	5
37	4
38	8
39	4
40	8
41	2
42	8
43	6
44	4
45	6
46	10
47	3
48	6
49	5
50	7
51	4
52	8
53	4
54	10
55	6
56	4
57	4
58	12
59	2
60	6
61	6
62	7
63	8
64	7
65	4
66	8
67	4
68	8
69	4
70	14
71	2
72	5
73	6
74	6
75	8
76	8
77	4
78	12
79	5
80	4
81	5
82	12
83	4
84	6
85	6
86	8
87	4
88	12
89	4
90	10
91	6
92	4
93	6
94	12
95	4
96	6
97	6
98	10
99	6
100	9

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

cp's OEIS Frontend

A086375 Number of factors over Q in the factorization of U_n(x) + 1 where U_n(x) is the Chebyshev polynomial of the second kind.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	4
7	3
8	3
9	3
10	6
11	2
12	4
13	4
14	5
15	4
16	5
17	2
18	7
19	4
20	4
21	4
22	8
23	3
24	4
25	5
26	6
27	4
28	8
29	2
30	8
31	4
32	3
33	6
34	9
35	4
36	5
37	4
38	8
39	4
40	8
41	2
42	8
43	6
44	4
45	6
46	10
47	3
48	6
49	5
50	7
51	4
52	8
53	4
54	10
55	6
56	4
57	4
58	12
59	2
60	6
61	6
62	7
63	8
64	7
65	4
66	8
67	4
68	8
69	4
70	14
71	2
72	5
73	6
74	6
75	8
76	8
77	4
78	12
79	5
80	4
81	5
82	12
83	4
84	6
85	6
86	8
87	4
88	12
89	4
90	10
91	6
92	4
93	6
94	12
95	4
96	6
97	6
98	10
99	6
100	9

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	4
7	3
8	3
9	3
10	6
11	2
12	4
13	4
14	5
15	4
16	5
17	2
18	7
19	4
20	4
21	4
22	8
23	3
24	4
25	5
26	6
27	4
28	8
29	2
30	8
31	4
32	3
33	6
34	9
35	4
36	5
37	4
38	8
39	4
40	8
41	2
42	8
43	6
44	4
45	6
46	10
47	3
48	6
49	5
50	7
51	4
52	8
53	4
54	10
55	6
56	4
57	4
58	12
59	2
60	6
61	6
62	7
63	8
64	7
65	4
66	8
67	4
68	8
69	4
70	14
71	2
72	5
73	6
74	6
75	8
76	8
77	4
78	12
79	5
80	4
81	5
82	12
83	4
84	6
85	6
86	8
87	4
88	12
89	4
90	10
91	6
92	4
93	6
94	12
95	4
96	6
97	6
98	10
99	6
100	9

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	4
7	3
8	3
9	3
10	6
11	2
12	4
13	4
14	5
15	4
16	5
17	2
18	7
19	4
20	4
21	4
22	8
23	3
24	4
25	5
26	6
27	4
28	8
29	2
30	8
31	4
32	3
33	6
34	9
35	4
36	5
37	4
38	8
39	4
40	8
41	2
42	8
43	6
44	4
45	6
46	10
47	3
48	6
49	5
50	7
51	4
52	8
53	4
54	10
55	6
56	4
57	4
58	12
59	2
60	6
61	6
62	7
63	8
64	7
65	4
66	8
67	4
68	8
69	4
70	14
71	2
72	5
73	6
74	6
75	8
76	8
77	4
78	12
79	5
80	4
81	5
82	12
83	4
84	6
85	6
86	8
87	4
88	12
89	4
90	10
91	6
92	4
93	6
94	12
95	4
96	6
97	6
98	10
99	6
100	9