A049807 - cp's OEIS frontend

A049807 a(n)=number of Farey fractions of order n that are <=1/3; cf. A049805.

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	10
10	12
11	15
12	16
13	20
14	22
15	25
16	28
17	33
18	35
19	41
20	43
21	47
22	51
23	58
24	61
25	68
26	72
27	78
28	82
29	91
30	93
31	103
32	108
33	115
34	121
35	129
36	133
37	145
38	151
39	159
40	165
41	178
42	182
43	196
44	202
45	210
46	218
47	233
48	238
49	252
50	258
51	269
52	277
53	294
54	300

[1, 1, 2, 3, 4, 5, 7, 8, 10, 12, 15, 16, 20, 22, 25, 28, 33, 35, 41, 43, 47, 51, 58, 61, 68, 72, 78, 82, 91, 93, 103, 108, 115, 121, 129, 133, 145, 151, 159, 165, 178, 182, 196, 202, 210, 218, 233, 238, 252, 258, 269, 277, 294, 300]

cp's OEIS Frontend

A049807 a(n)=number of Farey fractions of order n that are <=1/3; cf. A049805.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	10
10	12
11	15
12	16
13	20
14	22
15	25
16	28
17	33
18	35
19	41
20	43
21	47
22	51
23	58
24	61
25	68
26	72
27	78
28	82
29	91
30	93
31	103
32	108
33	115
34	121
35	129
36	133
37	145
38	151
39	159
40	165
41	178
42	182
43	196
44	202
45	210
46	218
47	233
48	238
49	252
50	258
51	269
52	277
53	294
54	300

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	10
10	12
11	15
12	16
13	20
14	22
15	25
16	28
17	33
18	35
19	41
20	43
21	47
22	51
23	58
24	61
25	68
26	72
27	78
28	82
29	91
30	93
31	103
32	108
33	115
34	121
35	129
36	133
37	145
38	151
39	159
40	165
41	178
42	182
43	196
44	202
45	210
46	218
47	233
48	238
49	252
50	258
51	269
52	277
53	294
54	300

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	10
10	12
11	15
12	16
13	20
14	22
15	25
16	28
17	33
18	35
19	41
20	43
21	47
22	51
23	58
24	61
25	68
26	72
27	78
28	82
29	91
30	93
31	103
32	108
33	115
34	121
35	129
36	133
37	145
38	151
39	159
40	165
41	178
42	182
43	196
44	202
45	210
46	218
47	233
48	238
49	252
50	258
51	269
52	277
53	294
54	300