A064123 - cp's OEIS frontend

A064123 Number of divisors of 5^n - 1 that are relatively prime to 5^m - 1 for all 0 < m < n.

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

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

cp's OEIS Frontend

A064123 Number of divisors of 5^n - 1 that are relatively prime to 5^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	2
7	2
8	2
9	4
10	2
11	2
12	2
13	2
14	4
15	4
16	4
17	4
18	2
19	8
20	4
21	4
22	8
23	4
24	2
25	16
26	4
27	16
28	2
29	8
30	4
31	4
32	4
33	4
34	4
35	16
36	4
37	8
38	8
39	4
40	4
41	4
42	8
43	4
44	4
45	8
46	4
47	2
48	2
49	2
50	4
51	8
52	4
53	8
54	8
55	16
56	2
57	2
58	4
59	4
60	4
61	8
62	8
63	8
64	8
65	8
66	4
67	32
68	16
69	16
70	4
71	4
72	8
73	8
74	8
75	32
76	4
77	8
78	4
79	8
80	4
81	4
82	16
83	8
84	4
85	8
86	16
87	8
88	2
89	64
90	2
91	4
92	2
93	8
94	8
95	16
96	4
97	8
98	8

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

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