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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.

A373736 a(n) = largest nondivisor k < n such that A007947(k) | n, or 0 if k does not exist.

Table of values

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

List of values

[0, 0, 0, 0, 0, 4, 0, 0, 0, 8, 0, 9, 0, 8, 9, 0, 0, 16, 0, 16, 9, 16, 0, 18, 0, 16, 0, 16, 0, 27, 0, 0, 27, 32, 25, 32, 0, 32, 27, 32, 0, 36, 0, 32, 27, 32, 0, 36, 0, 40, 27, 32, 0, 48, 25, 49, 27, 32, 0, 54, 0, 32, 49, 0, 25, 64, 0, 64, 27, 64, 0, 64, 0, 64, 45]

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

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