A070610 - cp's OEIS frontend

A070610 Number of positive integers k such that sigma(k) divides sigma(n).

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

[1, 2, 2, 2, 3, 6, 3, 3, 2, 5, 6, 5, 3, 10, 10, 3, 5, 4, 3, 8, 5, 9, 10, 12, 3, 8, 5, 8, 5, 18, 5, 4, 13, 7, 13, 4, 2, 12, 8, 10, 8, 19, 3, 15, 6, 18, 13, 7, 3, 5, 18, 5, 7, 21, 18, 21, 7, 10, 12, 27, 4, 19, 6, 2, 15, 26, 3, 13, 19, 26, 18, 6, 2, 7, 7, 8, 19, 27, 7, 9, 2, 13, 15, 14, 13, 9]

cp's OEIS Frontend

A070610 Number of positive integers k such that sigma(k) divides sigma(n).

Table of values

List of values

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

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

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