A020653 - cp's OEIS frontend

A020653 Denominators in a certain bijection from positive integers to positive rationals.

n	a(n)
1	1
2	2
3	1
4	3
5	1
6	4
7	3
8	2
9	1
10	5
11	1
12	6
13	5
14	4
15	3
16	2
17	1
18	7
19	5
20	3
21	1
22	8
23	7
24	5
25	4
26	2
27	1
28	9
29	7
30	3
31	1
32	10
33	9
34	8
35	7
36	6
37	5
38	4
39	3
40	2
41	1
42	11
43	7
44	5
45	1
46	12
47	11
48	10
49	9
50	8
51	7
52	6
53	5
54	4
55	3
56	2
57	1
58	13
59	11
60	9
61	5
62	3
63	1
64	14
65	13
66	11
67	8
68	7
69	4
70	2
71	1
72	15
73	13
74	11
75	9
76	7
77	5
78	3
79	1
80	16
81	15
82	14
83	13
84	12
85	11
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	2
95	1
96	17

[1, 2, 1, 3, 1, 4, 3, 2, 1, 5, 1, 6, 5, 4, 3, 2, 1, 7, 5, 3, 1, 8, 7, 5, 4, 2, 1, 9, 7, 3, 1, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 11, 7, 5, 1, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 13, 11, 9, 5, 3, 1, 14, 13, 11, 8, 7, 4, 2, 1, 15, 13, 11, 9, 7, 5, 3, 1, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 17]

cp's OEIS Frontend

A020653 Denominators in a certain bijection from positive integers to positive rationals.

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	3
5	1
6	4
7	3
8	2
9	1
10	5
11	1
12	6
13	5
14	4
15	3
16	2
17	1
18	7
19	5
20	3
21	1
22	8
23	7
24	5
25	4
26	2
27	1
28	9
29	7
30	3
31	1
32	10
33	9
34	8
35	7
36	6
37	5
38	4
39	3
40	2
41	1
42	11
43	7
44	5
45	1
46	12
47	11
48	10
49	9
50	8
51	7
52	6
53	5
54	4
55	3
56	2
57	1
58	13
59	11
60	9
61	5
62	3
63	1
64	14
65	13
66	11
67	8
68	7
69	4
70	2
71	1
72	15
73	13
74	11
75	9
76	7
77	5
78	3
79	1
80	16
81	15
82	14
83	13
84	12
85	11
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	2
95	1
96	17

n	a(n)
1	1
2	2
3	1
4	3
5	1
6	4
7	3
8	2
9	1
10	5
11	1
12	6
13	5
14	4
15	3
16	2
17	1
18	7
19	5
20	3
21	1
22	8
23	7
24	5
25	4
26	2
27	1
28	9
29	7
30	3
31	1
32	10
33	9
34	8
35	7
36	6
37	5
38	4
39	3
40	2
41	1
42	11
43	7
44	5
45	1
46	12
47	11
48	10
49	9
50	8
51	7
52	6
53	5
54	4
55	3
56	2
57	1
58	13
59	11
60	9
61	5
62	3
63	1
64	14
65	13
66	11
67	8
68	7
69	4
70	2
71	1
72	15
73	13
74	11
75	9
76	7
77	5
78	3
79	1
80	16
81	15
82	14
83	13
84	12
85	11
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	2
95	1
96	17

n	a(n)
1	1
2	2
3	1
4	3
5	1
6	4
7	3
8	2
9	1
10	5
11	1
12	6
13	5
14	4
15	3
16	2
17	1
18	7
19	5
20	3
21	1
22	8
23	7
24	5
25	4
26	2
27	1
28	9
29	7
30	3
31	1
32	10
33	9
34	8
35	7
36	6
37	5
38	4
39	3
40	2
41	1
42	11
43	7
44	5
45	1
46	12
47	11
48	10
49	9
50	8
51	7
52	6
53	5
54	4
55	3
56	2
57	1
58	13
59	11
60	9
61	5
62	3
63	1
64	14
65	13
66	11
67	8
68	7
69	4
70	2
71	1
72	15
73	13
74	11
75	9
76	7
77	5
78	3
79	1
80	16
81	15
82	14
83	13
84	12
85	11
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	2
95	1
96	17