A066102 - cp's OEIS frontend

A066102 Number of distinct prime factors of sigma_4(n), the sum of the 4th powers of divisors of n.

n	a(n)
1	0
2	1
3	2
4	3
5	2
6	3
7	2
8	2
9	3
10	3
11	2
12	5
13	2
14	3
15	3
16	4
17	2
18	4
19	3
20	5
21	3
22	3
23	2
24	4
25	4
26	3
27	4
28	5
29	2
30	4
31	3
32	5
33	3
34	3
35	3
36	4
37	3
38	3
39	3
40	4
41	3
42	4
43	4
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	3
52	5
53	3
54	4
55	3
56	4
57	4
58	3
59	4
60	6
61	2
62	4
63	5
64	4
65	3
66	4
67	3
68	5
69	3
70	4
71	2
72	5
73	2
74	4
75	6
76	6
77	3
78	4
79	4
80	6
81	4
82	4
83	4
84	6
85	3
86	4
87	3
88	4
89	3
90	6
91	3
92	5
93	4
94	4
95	4
96	7
97	3
98	6
99	5
100	5
101	3
102	4
103	2
104	4
105	4

[0, 1, 2, 3, 2, 3, 2, 2, 3, 3, 2, 5, 2, 3, 3, 4, 2, 4, 3, 5, 3, 3, 2, 4, 4, 3, 4, 5, 2, 4, 3, 5, 3, 3, 3, 4, 3, 3, 3, 4, 3, 4, 4, 5, 5, 3, 3, 5, 5, 5, 3, 5, 3, 4, 3, 4, 4, 3, 4, 6, 2, 4, 5, 4, 3, 4, 3, 5, 3, 4, 2, 5, 2, 4, 6, 6, 3, 4, 4, 6, 4, 4, 4, 6, 3, 4, 3, 4, 3, 6, 3, 5, 4, 4, 4, 7, 3, 6, 5, 5, 3, 4, 2, 4, 4]

cp's OEIS Frontend

A066102 Number of distinct prime factors of sigma_4(n), the sum of the 4th powers of divisors of n.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	2
6	3
7	2
8	2
9	3
10	3
11	2
12	5
13	2
14	3
15	3
16	4
17	2
18	4
19	3
20	5
21	3
22	3
23	2
24	4
25	4
26	3
27	4
28	5
29	2
30	4
31	3
32	5
33	3
34	3
35	3
36	4
37	3
38	3
39	3
40	4
41	3
42	4
43	4
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	3
52	5
53	3
54	4
55	3
56	4
57	4
58	3
59	4
60	6
61	2
62	4
63	5
64	4
65	3
66	4
67	3
68	5
69	3
70	4
71	2
72	5
73	2
74	4
75	6
76	6
77	3
78	4
79	4
80	6
81	4
82	4
83	4
84	6
85	3
86	4
87	3
88	4
89	3
90	6
91	3
92	5
93	4
94	4
95	4
96	7
97	3
98	6
99	5
100	5
101	3
102	4
103	2
104	4
105	4

n	a(n)
1	0
2	1
3	2
4	3
5	2
6	3
7	2
8	2
9	3
10	3
11	2
12	5
13	2
14	3
15	3
16	4
17	2
18	4
19	3
20	5
21	3
22	3
23	2
24	4
25	4
26	3
27	4
28	5
29	2
30	4
31	3
32	5
33	3
34	3
35	3
36	4
37	3
38	3
39	3
40	4
41	3
42	4
43	4
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	3
52	5
53	3
54	4
55	3
56	4
57	4
58	3
59	4
60	6
61	2
62	4
63	5
64	4
65	3
66	4
67	3
68	5
69	3
70	4
71	2
72	5
73	2
74	4
75	6
76	6
77	3
78	4
79	4
80	6
81	4
82	4
83	4
84	6
85	3
86	4
87	3
88	4
89	3
90	6
91	3
92	5
93	4
94	4
95	4
96	7
97	3
98	6
99	5
100	5
101	3
102	4
103	2
104	4
105	4

n	a(n)
1	0
2	1
3	2
4	3
5	2
6	3
7	2
8	2
9	3
10	3
11	2
12	5
13	2
14	3
15	3
16	4
17	2
18	4
19	3
20	5
21	3
22	3
23	2
24	4
25	4
26	3
27	4
28	5
29	2
30	4
31	3
32	5
33	3
34	3
35	3
36	4
37	3
38	3
39	3
40	4
41	3
42	4
43	4
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	3
52	5
53	3
54	4
55	3
56	4
57	4
58	3
59	4
60	6
61	2
62	4
63	5
64	4
65	3
66	4
67	3
68	5
69	3
70	4
71	2
72	5
73	2
74	4
75	6
76	6
77	3
78	4
79	4
80	6
81	4
82	4
83	4
84	6
85	3
86	4
87	3
88	4
89	3
90	6
91	3
92	5
93	4
94	4
95	4
96	7
97	3
98	6
99	5
100	5
101	3
102	4
103	2
104	4
105	4