A318060 - cp's OEIS frontend

A318060 a(n) is the denominator of sigma(sigma(n))/n.

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

[1, 1, 3, 1, 5, 3, 7, 1, 9, 10, 11, 3, 13, 7, 1, 1, 17, 9, 19, 5, 1, 22, 23, 1, 25, 13, 3, 7, 29, 2, 31, 4, 33, 17, 35, 9, 37, 19, 13, 20, 41, 1, 43, 11, 15, 46, 47, 3, 49, 25, 17, 52, 53, 3, 11, 7, 19, 29, 59, 1, 61, 31, 3, 1, 65, 66, 67, 17, 23, 70]

cp's OEIS Frontend

A318060 a(n) is the denominator of sigma(sigma(n))/n.

Table of values

List of values

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

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

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