A063982 - cp's OEIS frontend

A063982 Number of divisors of 2^n - 1 that are relatively prime to 2^m - 1 for all 0 < m < n.

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

[1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 4, 2, 2, 4, 8, 2, 2, 2, 2, 2, 4, 4, 4, 2, 4, 2, 4, 2, 8, 4, 4, 2, 8, 4, 2, 4, 8, 8, 8, 2, 8, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 4, 4, 8, 2, 4, 8, 4, 8, 4, 4, 8, 2, 2, 8, 2, 8, 4, 4, 4, 2, 2, 4, 4, 2, 2, 8, 16, 2, 4, 8, 4, 4, 2, 8, 8]

cp's OEIS Frontend

A063982 Number of divisors of 2^n - 1 that are relatively prime to 2^m - 1 for all 0 < m < n.

Table of values

List of values

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

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

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