A317988 - cp's OEIS frontend

A317988 Farey fraction tree, reading each fraction's numerator first, then its denominator.

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	3
11	1
12	4
13	3
14	4
15	1
16	5
17	2
18	5
19	3
20	5
21	4
22	5
23	1
24	6
25	5
26	6
27	1
28	7
29	2
30	7
31	3
32	7
33	4
34	7
35	5
36	7
37	6
38	7
39	1
40	8
41	3
42	8
43	5
44	8
45	7
46	8
47	1
48	9
49	2
50	9
51	4
52	9
53	5
54	9
55	7
56	9
57	8
58	9
59	1
60	10
61	3
62	10
63	7
64	10
65	9
66	10
67	1
68	11
69	2
70	11
71	3
72	11
73	4
74	11
75	5
76	11
77	6
78	11
79	7
80	11
81	8
82	11
83	9
84	11
85	10
86	11
87	1
88	12
89	5
90	12
91	7
92	12
93	11
94	12

[0, 1, 1, 1, 1, 2, 1, 3, 2, 3, 1, 4, 3, 4, 1, 5, 2, 5, 3, 5, 4, 5, 1, 6, 5, 6, 1, 7, 2, 7, 3, 7, 4, 7, 5, 7, 6, 7, 1, 8, 3, 8, 5, 8, 7, 8, 1, 9, 2, 9, 4, 9, 5, 9, 7, 9, 8, 9, 1, 10, 3, 10, 7, 10, 9, 10, 1, 11, 2, 11, 3, 11, 4, 11, 5, 11, 6, 11, 7, 11, 8, 11, 9, 11, 10, 11, 1, 12, 5, 12, 7, 12, 11, 12]

cp's OEIS Frontend

A317988 Farey fraction tree, reading each fraction's numerator first, then its denominator.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	3
11	1
12	4
13	3
14	4
15	1
16	5
17	2
18	5
19	3
20	5
21	4
22	5
23	1
24	6
25	5
26	6
27	1
28	7
29	2
30	7
31	3
32	7
33	4
34	7
35	5
36	7
37	6
38	7
39	1
40	8
41	3
42	8
43	5
44	8
45	7
46	8
47	1
48	9
49	2
50	9
51	4
52	9
53	5
54	9
55	7
56	9
57	8
58	9
59	1
60	10
61	3
62	10
63	7
64	10
65	9
66	10
67	1
68	11
69	2
70	11
71	3
72	11
73	4
74	11
75	5
76	11
77	6
78	11
79	7
80	11
81	8
82	11
83	9
84	11
85	10
86	11
87	1
88	12
89	5
90	12
91	7
92	12
93	11
94	12

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	3
11	1
12	4
13	3
14	4
15	1
16	5
17	2
18	5
19	3
20	5
21	4
22	5
23	1
24	6
25	5
26	6
27	1
28	7
29	2
30	7
31	3
32	7
33	4
34	7
35	5
36	7
37	6
38	7
39	1
40	8
41	3
42	8
43	5
44	8
45	7
46	8
47	1
48	9
49	2
50	9
51	4
52	9
53	5
54	9
55	7
56	9
57	8
58	9
59	1
60	10
61	3
62	10
63	7
64	10
65	9
66	10
67	1
68	11
69	2
70	11
71	3
72	11
73	4
74	11
75	5
76	11
77	6
78	11
79	7
80	11
81	8
82	11
83	9
84	11
85	10
86	11
87	1
88	12
89	5
90	12
91	7
92	12
93	11
94	12

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	3
11	1
12	4
13	3
14	4
15	1
16	5
17	2
18	5
19	3
20	5
21	4
22	5
23	1
24	6
25	5
26	6
27	1
28	7
29	2
30	7
31	3
32	7
33	4
34	7
35	5
36	7
37	6
38	7
39	1
40	8
41	3
42	8
43	5
44	8
45	7
46	8
47	1
48	9
49	2
50	9
51	4
52	9
53	5
54	9
55	7
56	9
57	8
58	9
59	1
60	10
61	3
62	10
63	7
64	10
65	9
66	10
67	1
68	11
69	2
70	11
71	3
72	11
73	4
74	11
75	5
76	11
77	6
78	11
79	7
80	11
81	8
82	11
83	9
84	11
85	10
86	11
87	1
88	12
89	5
90	12
91	7
92	12
93	11
94	12