A037228 - cp's OEIS frontend

A037228 a(n) = phi(n) - pi(n).

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

[1, 0, 0, 0, 1, -1, 2, 0, 2, 0, 5, -1, 6, 0, 2, 2, 9, -1, 10, 0, 4, 2, 13, -1, 11, 3, 9, 3, 18, -2, 19, 5, 9, 5, 13, 1, 24, 6, 12, 4, 27, -1, 28, 6, 10, 8, 31, 1, 27, 5, 17, 9, 36, 2, 24, 8, 20, 12, 41, -1, 42, 12, 18, 14, 30, 2, 47, 13, 25, 5, 50, 4, 51, 15, 19, 15, 39, 3, 56, 10, 32, 18, 59, 1, 41, 19]

cp's OEIS Frontend

A037228 a(n) = phi(n) - pi(n).

Table of values

List of values

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

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

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