A163106 - cp's OEIS frontend

A163106 a(n) = sigma(sigma(tau(n))), where tau = number of divisors and sigma = sum of divisors.

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

[1, 4, 4, 7, 4, 8, 4, 8, 7, 8, 4, 28, 4, 8, 8, 12, 4, 28, 4, 28, 8, 8, 4, 24, 7, 8, 8, 28, 4, 24, 4, 28, 8, 8, 8, 14, 4, 8, 8, 24, 4, 24, 4, 28, 28, 8, 4, 39, 7, 28, 8, 28, 4, 24, 8, 24, 8, 8, 4, 56, 4, 8, 28, 15, 8, 24, 4, 28, 8, 24, 4, 56, 4, 8, 28, 28, 8, 24, 4, 39, 12, 8, 4, 56, 8, 8, 8, 24, 4]

cp's OEIS Frontend

A163106 a(n) = sigma(sigma(tau(n))), where tau = number of divisors and sigma = sum of divisors.

Table of values

List of values

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

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

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