A063070 - cp's OEIS frontend

A063070 a(n) = phi(n) - d(n), where d(n) is the number of divisors function (A000005).

n	a(n)
1	0
2	-1
3	0
4	-1
5	2
6	-2
7	4
8	0
9	3
10	0
11	8
12	-2
13	10
14	2
15	4
16	3
17	14
18	0
19	16
20	2
21	8
22	6
23	20
24	0
25	17
26	8
27	14
28	6
29	26
30	0
31	28
32	10
33	16
34	12
35	20
36	3
37	34
38	14
39	20
40	8
41	38
42	4
43	40
44	14
45	18
46	18
47	44
48	6
49	39
50	14
51	28
52	18
53	50
54	10
55	36
56	16
57	32
58	24
59	56
60	4
61	58
62	26
63	30
64	25
65	44
66	12
67	64
68	26
69	40
70	16
71	68
72	12
73	70
74	32
75	34
76	30
77	56
78	16
79	76
80	22
81	49
82	36
83	80
84	12
85	60
86	38
87	52
88	32
89	86
90	12
91	68
92	38

[0, -1, 0, -1, 2, -2, 4, 0, 3, 0, 8, -2, 10, 2, 4, 3, 14, 0, 16, 2, 8, 6, 20, 0, 17, 8, 14, 6, 26, 0, 28, 10, 16, 12, 20, 3, 34, 14, 20, 8, 38, 4, 40, 14, 18, 18, 44, 6, 39, 14, 28, 18, 50, 10, 36, 16, 32, 24, 56, 4, 58, 26, 30, 25, 44, 12, 64, 26, 40, 16, 68, 12, 70, 32, 34, 30, 56, 16, 76, 22, 49, 36, 80, 12, 60, 38, 52, 32, 86, 12, 68, 38]

cp's OEIS Frontend

A063070 a(n) = phi(n) - d(n), where d(n) is the number of divisors function (A000005).

Table of values

List of values

n	a(n)
1	0
2	-1
3	0
4	-1
5	2
6	-2
7	4
8	0
9	3
10	0
11	8
12	-2
13	10
14	2
15	4
16	3
17	14
18	0
19	16
20	2
21	8
22	6
23	20
24	0
25	17
26	8
27	14
28	6
29	26
30	0
31	28
32	10
33	16
34	12
35	20
36	3
37	34
38	14
39	20
40	8
41	38
42	4
43	40
44	14
45	18
46	18
47	44
48	6
49	39
50	14
51	28
52	18
53	50
54	10
55	36
56	16
57	32
58	24
59	56
60	4
61	58
62	26
63	30
64	25
65	44
66	12
67	64
68	26
69	40
70	16
71	68
72	12
73	70
74	32
75	34
76	30
77	56
78	16
79	76
80	22
81	49
82	36
83	80
84	12
85	60
86	38
87	52
88	32
89	86
90	12
91	68
92	38

n	a(n)
1	0
2	-1
3	0
4	-1
5	2
6	-2
7	4
8	0
9	3
10	0
11	8
12	-2
13	10
14	2
15	4
16	3
17	14
18	0
19	16
20	2
21	8
22	6
23	20
24	0
25	17
26	8
27	14
28	6
29	26
30	0
31	28
32	10
33	16
34	12
35	20
36	3
37	34
38	14
39	20
40	8
41	38
42	4
43	40
44	14
45	18
46	18
47	44
48	6
49	39
50	14
51	28
52	18
53	50
54	10
55	36
56	16
57	32
58	24
59	56
60	4
61	58
62	26
63	30
64	25
65	44
66	12
67	64
68	26
69	40
70	16
71	68
72	12
73	70
74	32
75	34
76	30
77	56
78	16
79	76
80	22
81	49
82	36
83	80
84	12
85	60
86	38
87	52
88	32
89	86
90	12
91	68
92	38

n	a(n)
1	0
2	-1
3	0
4	-1
5	2
6	-2
7	4
8	0
9	3
10	0
11	8
12	-2
13	10
14	2
15	4
16	3
17	14
18	0
19	16
20	2
21	8
22	6
23	20
24	0
25	17
26	8
27	14
28	6
29	26
30	0
31	28
32	10
33	16
34	12
35	20
36	3
37	34
38	14
39	20
40	8
41	38
42	4
43	40
44	14
45	18
46	18
47	44
48	6
49	39
50	14
51	28
52	18
53	50
54	10
55	36
56	16
57	32
58	24
59	56
60	4
61	58
62	26
63	30
64	25
65	44
66	12
67	64
68	26
69	40
70	16
71	68
72	12
73	70
74	32
75	34
76	30
77	56
78	16
79	76
80	22
81	49
82	36
83	80
84	12
85	60
86	38
87	52
88	32
89	86
90	12
91	68
92	38