A385122 - cp's OEIS frontend

A385122 a(n) = d(phi(n)) - phi(d(n)) where d(n) = A000005(n) is the number of divisors and phi(n) = A000010(n) is the Euler totient function.

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	3
8	1
9	2
10	1
11	3
12	1
13	5
14	2
15	2
16	0
17	4
18	2
19	5
20	2
21	4
22	2
23	3
24	0
25	4
26	4
27	4
28	4
29	5
30	0
31	7
32	3
33	4
34	3
35	6
36	0
37	8
38	4
39	6
40	1
41	7
42	2
43	7
44	4
45	6
46	2
47	3
48	1
49	6
50	4
51	4
52	6
53	5
54	2
55	6
56	4
57	7
58	4
59	3
60	1
61	11
62	6
63	7
64	0
65	8
66	2
67	7
68	4
69	4
70	4
71	7
72	4
73	11
74	7
75	6
76	7
77	10
78	4
79	7
80	2
81	4
82	6
83	3
84	4
85	5
86	6

[0, 0, 1, 0, 2, 0, 3, 1, 2, 1, 3, 1, 5, 2, 2, 0, 4, 2, 5, 2, 4, 2, 3, 0, 4, 4, 4, 4, 5, 0, 7, 3, 4, 3, 6, 0, 8, 4, 6, 1, 7, 2, 7, 4, 6, 2, 3, 1, 6, 4, 4, 6, 5, 2, 6, 4, 7, 4, 3, 1, 11, 6, 7, 0, 8, 2, 7, 4, 4, 4, 7, 4, 11, 7, 6, 7, 10, 4, 7, 2, 4, 6, 3, 4, 5, 6]

cp's OEIS Frontend

A385122 a(n) = d(phi(n)) - phi(d(n)) where d(n) = A000005(n) is the number of divisors and phi(n) = A000010(n) is the Euler totient function.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	3
8	1
9	2
10	1
11	3
12	1
13	5
14	2
15	2
16	0
17	4
18	2
19	5
20	2
21	4
22	2
23	3
24	0
25	4
26	4
27	4
28	4
29	5
30	0
31	7
32	3
33	4
34	3
35	6
36	0
37	8
38	4
39	6
40	1
41	7
42	2
43	7
44	4
45	6
46	2
47	3
48	1
49	6
50	4
51	4
52	6
53	5
54	2
55	6
56	4
57	7
58	4
59	3
60	1
61	11
62	6
63	7
64	0
65	8
66	2
67	7
68	4
69	4
70	4
71	7
72	4
73	11
74	7
75	6
76	7
77	10
78	4
79	7
80	2
81	4
82	6
83	3
84	4
85	5
86	6

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	3
8	1
9	2
10	1
11	3
12	1
13	5
14	2
15	2
16	0
17	4
18	2
19	5
20	2
21	4
22	2
23	3
24	0
25	4
26	4
27	4
28	4
29	5
30	0
31	7
32	3
33	4
34	3
35	6
36	0
37	8
38	4
39	6
40	1
41	7
42	2
43	7
44	4
45	6
46	2
47	3
48	1
49	6
50	4
51	4
52	6
53	5
54	2
55	6
56	4
57	7
58	4
59	3
60	1
61	11
62	6
63	7
64	0
65	8
66	2
67	7
68	4
69	4
70	4
71	7
72	4
73	11
74	7
75	6
76	7
77	10
78	4
79	7
80	2
81	4
82	6
83	3
84	4
85	5
86	6

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	3
8	1
9	2
10	1
11	3
12	1
13	5
14	2
15	2
16	0
17	4
18	2
19	5
20	2
21	4
22	2
23	3
24	0
25	4
26	4
27	4
28	4
29	5
30	0
31	7
32	3
33	4
34	3
35	6
36	0
37	8
38	4
39	6
40	1
41	7
42	2
43	7
44	4
45	6
46	2
47	3
48	1
49	6
50	4
51	4
52	6
53	5
54	2
55	6
56	4
57	7
58	4
59	3
60	1
61	11
62	6
63	7
64	0
65	8
66	2
67	7
68	4
69	4
70	4
71	7
72	4
73	11
74	7
75	6
76	7
77	10
78	4
79	7
80	2
81	4
82	6
83	3
84	4
85	5
86	6