A163105 - cp's OEIS frontend

A163105 a(n) = tau(sigma(tau(n))), where tau = number of divisors of n (A000005), and sigma = sum of divisors of n (A000203).

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

[1, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 6, 2, 2, 2, 4, 2, 6, 2, 6, 2, 2, 2, 4, 3, 2, 2, 6, 2, 4, 2, 6, 2, 2, 2, 2, 2, 2, 2, 4, 2, 4, 2, 6, 6, 2, 2, 6, 3, 6, 2, 6, 2, 4, 2, 4, 2, 2, 2, 6, 2, 2, 6, 4, 2, 4, 2, 6, 2, 4, 2, 6, 2, 2, 6, 6, 2, 4, 2, 6, 4, 2, 2, 6, 2, 2, 2, 4, 2, 6, 2, 6, 2, 2, 2, 6, 2, 6, 6, 2, 2, 4, 2, 4, 4]

cp's OEIS Frontend

A163105 a(n) = tau(sigma(tau(n))), where tau = number of divisors of n (A000005), and sigma = sum of divisors of n (A000203).

Table of values

List of values

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

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

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