A074919 - cp's OEIS frontend

A074919 Number of integers in {1, 2, ..., phi(n)} that are coprime to n.

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

[1, 1, 2, 1, 4, 1, 6, 2, 4, 2, 10, 1, 12, 3, 5, 4, 16, 2, 18, 3, 7, 5, 22, 3, 16, 6, 12, 5, 28, 2, 30, 8, 13, 8, 17, 4, 36, 9, 15, 6, 40, 3, 42, 9, 13, 11, 46, 5, 36, 8, 21, 11, 52, 6, 29, 10, 23, 14, 58, 4, 60, 15, 20, 16, 36, 6, 66, 15, 29, 8, 70, 8, 72, 18, 21, 17, 47, 7, 78, 13, 36]

cp's OEIS Frontend

A074919 Number of integers in {1, 2, ..., phi(n)} that are coprime to n.

Table of values

List of values

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

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

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