A163372 - cp's OEIS frontend

A163372 a(n) = sigma(phi(sigma(n))).

n	a(n)
1	1
2	3
3	3
4	12
5	3
6	7
7	7
8	15
9	28
10	12
11	7
12	28
13	12
14	15
15	15
16	72
17	12
18	60
19	15
20	28
21	31
22	28
23	15
24	31
25	72
26	28
27	31
28	60
29	15
30	60
31	31
32	91
33	31
34	39
35	31
36	195
37	39
38	31
39	60
40	60
41	28
42	63
43	42
44	60
45	60
46	60
47	31
48	168
49	91
50	168
51	60
52	96
53	39
54	63
55	60
56	63
57	63
58	60
59	31
60	124
61	72
62	63
63	124
64	312
65	60
66	124

[1, 3, 3, 12, 3, 7, 7, 15, 28, 12, 7, 28, 12, 15, 15, 72, 12, 60, 15, 28, 31, 28, 15, 31, 72, 28, 31, 60, 15, 60, 31, 91, 31, 39, 31, 195, 39, 31, 60, 60, 28, 63, 42, 60, 60, 60, 31, 168, 91, 168, 60, 96, 39, 63, 60, 63, 63, 60, 31, 124, 72, 63, 124, 312, 60, 124]

cp's OEIS Frontend

A163372 a(n) = sigma(phi(sigma(n))).

Table of values

List of values

n	a(n)
1	1
2	3
3	3
4	12
5	3
6	7
7	7
8	15
9	28
10	12
11	7
12	28
13	12
14	15
15	15
16	72
17	12
18	60
19	15
20	28
21	31
22	28
23	15
24	31
25	72
26	28
27	31
28	60
29	15
30	60
31	31
32	91
33	31
34	39
35	31
36	195
37	39
38	31
39	60
40	60
41	28
42	63
43	42
44	60
45	60
46	60
47	31
48	168
49	91
50	168
51	60
52	96
53	39
54	63
55	60
56	63
57	63
58	60
59	31
60	124
61	72
62	63
63	124
64	312
65	60
66	124

n	a(n)
1	1
2	3
3	3
4	12
5	3
6	7
7	7
8	15
9	28
10	12
11	7
12	28
13	12
14	15
15	15
16	72
17	12
18	60
19	15
20	28
21	31
22	28
23	15
24	31
25	72
26	28
27	31
28	60
29	15
30	60
31	31
32	91
33	31
34	39
35	31
36	195
37	39
38	31
39	60
40	60
41	28
42	63
43	42
44	60
45	60
46	60
47	31
48	168
49	91
50	168
51	60
52	96
53	39
54	63
55	60
56	63
57	63
58	60
59	31
60	124
61	72
62	63
63	124
64	312
65	60
66	124

n	a(n)
1	1
2	3
3	3
4	12
5	3
6	7
7	7
8	15
9	28
10	12
11	7
12	28
13	12
14	15
15	15
16	72
17	12
18	60
19	15
20	28
21	31
22	28
23	15
24	31
25	72
26	28
27	31
28	60
29	15
30	60
31	31
32	91
33	31
34	39
35	31
36	195
37	39
38	31
39	60
40	60
41	28
42	63
43	42
44	60
45	60
46	60
47	31
48	168
49	91
50	168
51	60
52	96
53	39
54	63
55	60
56	63
57	63
58	60
59	31
60	124
61	72
62	63
63	124
64	312
65	60
66	124