cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A339388 a(n) is the number of k in the range 1..n-1 such that a(k)*a(n-k) <= a(n-1).

Table of values

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

List of values

[0, 1, 2, 3, 4, 5, 4, 2, 2, 4, 6, 8, 10, 8, 4, 3, 2, 2, 4, 6, 8, 10, 10, 12, 10, 6, 4, 2, 2, 4, 6, 8, 14, 17, 20, 17, 14, 10, 6, 2, 2, 4, 6, 10, 16, 20, 26, 24, 20, 14, 10, 2, 2, 4, 6, 11, 16, 21, 26, 27, 24, 20, 14, 6, 2, 2, 4, 8, 16, 22, 28, 34, 36, 34, 20]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.