A064126 - cp's OEIS frontend

A064126 Number of divisors of 10^n - 1 that are relatively prime to 10^m - 1 for all 0 < m < n.

n	a(n)
1	3
2	2
3	2
4	2
5	4
6	4
7	4
8	4
9	2
10	2
11	4
12	2
13	8
14	2
15	4
16	4
17	4
18	4
19	2
20	4
21	8
22	8
23	2
24	2
25	8
26	4
27	4
28	8
29	32
30	8
31	8
32	32
33	4
34	8
35	8
36	2
37	8
38	2
39	2
40	4
41	16
42	8
43	16
44	8
45	4
46	16
47	4
48	2
49	4
50	8
51	16
52	4
53	16
54	4
55	16
56	4
57	8
58	4
59	4
60	8
61	128
62	2
63	32
64	16
65	4
66	4
67	8
68	8
69	8
70	4
71	4
72	8
73	8
74	8
75	8
76	4
77	16
78	16
79	64
80	4
81	32
82	4

[3, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 2, 8, 2, 4, 4, 4, 4, 2, 4, 8, 8, 2, 2, 8, 4, 4, 8, 32, 8, 8, 32, 4, 8, 8, 2, 8, 2, 2, 4, 16, 8, 16, 8, 4, 16, 4, 2, 4, 8, 16, 4, 16, 4, 16, 4, 8, 4, 4, 8, 128, 2, 32, 16, 4, 4, 8, 8, 8, 4, 4, 8, 8, 8, 8, 4, 16, 16, 64, 4, 32, 4]

cp's OEIS Frontend

A064126 Number of divisors of 10^n - 1 that are relatively prime to 10^m - 1 for all 0 < m < n.

Table of values

List of values

n	a(n)
1	3
2	2
3	2
4	2
5	4
6	4
7	4
8	4
9	2
10	2
11	4
12	2
13	8
14	2
15	4
16	4
17	4
18	4
19	2
20	4
21	8
22	8
23	2
24	2
25	8
26	4
27	4
28	8
29	32
30	8
31	8
32	32
33	4
34	8
35	8
36	2
37	8
38	2
39	2
40	4
41	16
42	8
43	16
44	8
45	4
46	16
47	4
48	2
49	4
50	8
51	16
52	4
53	16
54	4
55	16
56	4
57	8
58	4
59	4
60	8
61	128
62	2
63	32
64	16
65	4
66	4
67	8
68	8
69	8
70	4
71	4
72	8
73	8
74	8
75	8
76	4
77	16
78	16
79	64
80	4
81	32
82	4

n	a(n)
1	3
2	2
3	2
4	2
5	4
6	4
7	4
8	4
9	2
10	2
11	4
12	2
13	8
14	2
15	4
16	4
17	4
18	4
19	2
20	4
21	8
22	8
23	2
24	2
25	8
26	4
27	4
28	8
29	32
30	8
31	8
32	32
33	4
34	8
35	8
36	2
37	8
38	2
39	2
40	4
41	16
42	8
43	16
44	8
45	4
46	16
47	4
48	2
49	4
50	8
51	16
52	4
53	16
54	4
55	16
56	4
57	8
58	4
59	4
60	8
61	128
62	2
63	32
64	16
65	4
66	4
67	8
68	8
69	8
70	4
71	4
72	8
73	8
74	8
75	8
76	4
77	16
78	16
79	64
80	4
81	32
82	4

n	a(n)
1	3
2	2
3	2
4	2
5	4
6	4
7	4
8	4
9	2
10	2
11	4
12	2
13	8
14	2
15	4
16	4
17	4
18	4
19	2
20	4
21	8
22	8
23	2
24	2
25	8
26	4
27	4
28	8
29	32
30	8
31	8
32	32
33	4
34	8
35	8
36	2
37	8
38	2
39	2
40	4
41	16
42	8
43	16
44	8
45	4
46	16
47	4
48	2
49	4
50	8
51	16
52	4
53	16
54	4
55	16
56	4
57	8
58	4
59	4
60	8
61	128
62	2
63	32
64	16
65	4
66	4
67	8
68	8
69	8
70	4
71	4
72	8
73	8
74	8
75	8
76	4
77	16
78	16
79	64
80	4
81	32
82	4