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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.

A253249 Number of nonempty chains in the divides relation on the divisors of n.

Table of values

n a(n)
1 1
2 3
3 3
4 7
5 3
6 11
7 3
8 15
9 7
10 11
11 3
12 31
13 3
14 11
15 11
16 31
17 3
18 31
19 3
20 31
21 11
22 11
23 3
24 79
25 7
26 11
27 15
28 31
29 3
30 51
31 3
32 63
33 11
34 11
35 11
36 103
37 3
38 11
39 11
40 79
41 3
42 51
43 3
44 31
45 31
46 11
47 3
48 191
49 7
50 31
51 11
52 31
53 3
54 79
55 11
56 79
57 11
58 11
59 3
60 175
61 3
62 11
63 31
64 127
65 11
66 51
67 3
68 31
69 11
70 51

List of values

[1, 3, 3, 7, 3, 11, 3, 15, 7, 11, 3, 31, 3, 11, 11, 31, 3, 31, 3, 31, 11, 11, 3, 79, 7, 11, 15, 31, 3, 51, 3, 63, 11, 11, 11, 103, 3, 11, 11, 79, 3, 51, 3, 31, 31, 11, 3, 191, 7, 31, 11, 31, 3, 79, 11, 79, 11, 11, 3, 175, 3, 11, 31, 127, 11, 51, 3, 31, 11, 51]

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

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