A338170 - cp's OEIS frontend

A338170 a(n) is the number of divisors d of n such that tau(d) divides sigma(d).

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

[1, 1, 2, 1, 2, 3, 2, 1, 2, 2, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 2, 3, 2, 2, 3, 3, 2, 6, 2, 1, 4, 2, 4, 3, 2, 3, 4, 3, 2, 7, 2, 4, 5, 3, 2, 3, 3, 2, 4, 2, 2, 5, 4, 4, 4, 2, 2, 8, 2, 3, 4, 1, 4, 7, 2, 3, 4, 6, 2, 3, 2, 2, 4, 3, 4, 6, 2, 3, 3, 2, 2, 7, 4, 3, 4, 4, 2, 7, 4, 4, 4, 3, 4, 4, 2, 4, 5, 3, 2, 6, 2, 2, 8]

cp's OEIS Frontend

A338170 a(n) is the number of divisors d of n such that tau(d) divides sigma(d).

Table of values

List of values

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

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

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