A163370 - cp's OEIS frontend

A163370 a(n) = phi(sigma(phi(n))).

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

[1, 1, 2, 2, 6, 2, 4, 6, 4, 6, 6, 6, 12, 4, 8, 8, 30, 4, 24, 8, 12, 6, 12, 8, 12, 12, 24, 12, 24, 8, 24, 30, 12, 30, 16, 12, 72, 24, 16, 30, 24, 12, 32, 12, 16, 12, 24, 30, 32, 12, 36, 16, 42, 24, 24, 16, 72, 24, 24, 30, 48, 24, 72, 36, 60, 12, 48, 36, 24, 16]

cp's OEIS Frontend

A163370 a(n) = phi(sigma(phi(n))).

Table of values

List of values

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

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

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