A181830 - cp's OEIS frontend

A181830 The number of positive integers <= n that are strongly prime to n.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	2
9	2
10	1
11	6
12	2
13	6
14	4
15	4
16	4
17	11
18	4
19	12
20	6
21	6
22	6
23	18
24	6
25	12
26	9
27	14
28	8
29	22
30	6
31	22
32	14
33	14
34	12
35	20
36	8
37	27
38	16
39	20
40	12
41	32
42	10
43	34
44	18
45	18
46	16
47	42
48	14
49	32
50	17
51	26
52	20
53	46
54	16
55	32
56	20
57	28
58	24
59	54
60	14
61	48
62	28
63	32
64	26
65	41
66	16

[0, 0, 0, 0, 0, 1, 0, 2, 2, 2, 1, 6, 2, 6, 4, 4, 4, 11, 4, 12, 6, 6, 6, 18, 6, 12, 9, 14, 8, 22, 6, 22, 14, 14, 12, 20, 8, 27, 16, 20, 12, 32, 10, 34, 18, 18, 16, 42, 14, 32, 17, 26, 20, 46, 16, 32, 20, 28, 24, 54, 14, 48, 28, 32, 26, 41, 16]

cp's OEIS Frontend

A181830 The number of positive integers <= n that are strongly prime to n.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	2
9	2
10	1
11	6
12	2
13	6
14	4
15	4
16	4
17	11
18	4
19	12
20	6
21	6
22	6
23	18
24	6
25	12
26	9
27	14
28	8
29	22
30	6
31	22
32	14
33	14
34	12
35	20
36	8
37	27
38	16
39	20
40	12
41	32
42	10
43	34
44	18
45	18
46	16
47	42
48	14
49	32
50	17
51	26
52	20
53	46
54	16
55	32
56	20
57	28
58	24
59	54
60	14
61	48
62	28
63	32
64	26
65	41
66	16

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	2
9	2
10	1
11	6
12	2
13	6
14	4
15	4
16	4
17	11
18	4
19	12
20	6
21	6
22	6
23	18
24	6
25	12
26	9
27	14
28	8
29	22
30	6
31	22
32	14
33	14
34	12
35	20
36	8
37	27
38	16
39	20
40	12
41	32
42	10
43	34
44	18
45	18
46	16
47	42
48	14
49	32
50	17
51	26
52	20
53	46
54	16
55	32
56	20
57	28
58	24
59	54
60	14
61	48
62	28
63	32
64	26
65	41
66	16

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	0
7	2
8	2
9	2
10	1
11	6
12	2
13	6
14	4
15	4
16	4
17	11
18	4
19	12
20	6
21	6
22	6
23	18
24	6
25	12
26	9
27	14
28	8
29	22
30	6
31	22
32	14
33	14
34	12
35	20
36	8
37	27
38	16
39	20
40	12
41	32
42	10
43	34
44	18
45	18
46	16
47	42
48	14
49	32
50	17
51	26
52	20
53	46
54	16
55	32
56	20
57	28
58	24
59	54
60	14
61	48
62	28
63	32
64	26
65	41
66	16