A073809 - cp's OEIS frontend

A073809 Number of common divisors of sigma_1(n) and sigma_3(n).

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

[1, 2, 3, 1, 4, 6, 4, 4, 1, 6, 6, 6, 4, 8, 8, 2, 6, 2, 6, 8, 6, 9, 8, 12, 1, 8, 8, 4, 8, 12, 6, 3, 10, 8, 10, 1, 4, 12, 8, 12, 8, 12, 6, 6, 4, 12, 10, 6, 2, 2, 12, 4, 8, 16, 12, 16, 10, 12, 12, 16, 4, 12, 4, 2, 12, 15, 6, 12, 12, 15, 12, 8, 4, 8, 3, 12, 12, 16, 10, 8, 3, 12, 12, 12, 12, 12, 16]

cp's OEIS Frontend

A073809 Number of common divisors of sigma_1(n) and sigma_3(n).

Table of values

List of values

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

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

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