A049809 - cp's OEIS frontend

A049809 a(n)=number of Farey fractions of order n that are <=1/5; cf. A049805.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	4
8	5
9	6
10	7
11	9
12	10
13	12
14	13
15	15
16	17
17	20
18	21
19	24
20	26
21	29
22	31
23	35
24	36
25	40
26	43
27	47
28	50
29	55
30	56
31	62
32	65
33	69
34	72
35	77
36	80
37	87
38	91
39	96
40	99
41	107
42	109
43	117
44	121
45	126
46	131
47	140
48	143
49	151
50	155
51	162
52	167
53	177
54	180
55	188
56	193
57	201
58	207

[1, 1, 1, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 15, 17, 20, 21, 24, 26, 29, 31, 35, 36, 40, 43, 47, 50, 55, 56, 62, 65, 69, 72, 77, 80, 87, 91, 96, 99, 107, 109, 117, 121, 126, 131, 140, 143, 151, 155, 162, 167, 177, 180, 188, 193, 201, 207]

cp's OEIS Frontend

A049809 a(n)=number of Farey fractions of order n that are <=1/5; cf. A049805.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	4
8	5
9	6
10	7
11	9
12	10
13	12
14	13
15	15
16	17
17	20
18	21
19	24
20	26
21	29
22	31
23	35
24	36
25	40
26	43
27	47
28	50
29	55
30	56
31	62
32	65
33	69
34	72
35	77
36	80
37	87
38	91
39	96
40	99
41	107
42	109
43	117
44	121
45	126
46	131
47	140
48	143
49	151
50	155
51	162
52	167
53	177
54	180
55	188
56	193
57	201
58	207

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	4
8	5
9	6
10	7
11	9
12	10
13	12
14	13
15	15
16	17
17	20
18	21
19	24
20	26
21	29
22	31
23	35
24	36
25	40
26	43
27	47
28	50
29	55
30	56
31	62
32	65
33	69
34	72
35	77
36	80
37	87
38	91
39	96
40	99
41	107
42	109
43	117
44	121
45	126
46	131
47	140
48	143
49	151
50	155
51	162
52	167
53	177
54	180
55	188
56	193
57	201
58	207

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	4
8	5
9	6
10	7
11	9
12	10
13	12
14	13
15	15
16	17
17	20
18	21
19	24
20	26
21	29
22	31
23	35
24	36
25	40
26	43
27	47
28	50
29	55
30	56
31	62
32	65
33	69
34	72
35	77
36	80
37	87
38	91
39	96
40	99
41	107
42	109
43	117
44	121
45	126
46	131
47	140
48	143
49	151
50	155
51	162
52	167
53	177
54	180
55	188
56	193
57	201
58	207