A352420 - cp's OEIS frontend

A352420 Number of distinct prime factors of sigma_n(n).

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	4
7	3
8	2
9	3
10	5
11	6
12	8
13	5
14	5
15	8
16	6
17	3
18	8
19	5
20	11
21	9
22	7
23	8
24	10
25	8
26	8
27	10
28	12
29	7
30	13
31	7
32	11
33	15
34	10
35	15
36	11
37	7
38	8
39	11
40	10
41	6
42	14
43	8
44	14
45	14
46	11
47	10
48	17
49	6
50	21
51	15
52	16
53	8
54	18
55	16
56	15
57	16
58	6
59	9
60	22
61	8
62	10
63	17
64	13
65	17
66	17
67	7
68	17
69	20
70	17
71	8
72	23
73	4
74	13
75	21

[0, 1, 2, 3, 3, 4, 3, 2, 3, 5, 6, 8, 5, 5, 8, 6, 3, 8, 5, 11, 9, 7, 8, 10, 8, 8, 10, 12, 7, 13, 7, 11, 15, 10, 15, 11, 7, 8, 11, 10, 6, 14, 8, 14, 14, 11, 10, 17, 6, 21, 15, 16, 8, 18, 16, 15, 16, 6, 9, 22, 8, 10, 17, 13, 17, 17, 7, 17, 20, 17, 8, 23, 4, 13, 21]

cp's OEIS Frontend

A352420 Number of distinct prime factors of sigma_n(n).

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	4
7	3
8	2
9	3
10	5
11	6
12	8
13	5
14	5
15	8
16	6
17	3
18	8
19	5
20	11
21	9
22	7
23	8
24	10
25	8
26	8
27	10
28	12
29	7
30	13
31	7
32	11
33	15
34	10
35	15
36	11
37	7
38	8
39	11
40	10
41	6
42	14
43	8
44	14
45	14
46	11
47	10
48	17
49	6
50	21
51	15
52	16
53	8
54	18
55	16
56	15
57	16
58	6
59	9
60	22
61	8
62	10
63	17
64	13
65	17
66	17
67	7
68	17
69	20
70	17
71	8
72	23
73	4
74	13
75	21

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	4
7	3
8	2
9	3
10	5
11	6
12	8
13	5
14	5
15	8
16	6
17	3
18	8
19	5
20	11
21	9
22	7
23	8
24	10
25	8
26	8
27	10
28	12
29	7
30	13
31	7
32	11
33	15
34	10
35	15
36	11
37	7
38	8
39	11
40	10
41	6
42	14
43	8
44	14
45	14
46	11
47	10
48	17
49	6
50	21
51	15
52	16
53	8
54	18
55	16
56	15
57	16
58	6
59	9
60	22
61	8
62	10
63	17
64	13
65	17
66	17
67	7
68	17
69	20
70	17
71	8
72	23
73	4
74	13
75	21

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	4
7	3
8	2
9	3
10	5
11	6
12	8
13	5
14	5
15	8
16	6
17	3
18	8
19	5
20	11
21	9
22	7
23	8
24	10
25	8
26	8
27	10
28	12
29	7
30	13
31	7
32	11
33	15
34	10
35	15
36	11
37	7
38	8
39	11
40	10
41	6
42	14
43	8
44	14
45	14
46	11
47	10
48	17
49	6
50	21
51	15
52	16
53	8
54	18
55	16
56	15
57	16
58	6
59	9
60	22
61	8
62	10
63	17
64	13
65	17
66	17
67	7
68	17
69	20
70	17
71	8
72	23
73	4
74	13
75	21