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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.

A349949 a(n) is the number of divisors of n that are 1 above or 1 below a divisor of either n+1 or n-1.

Table of values

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

List of values

[1, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 4, 3, 2, 2, 2, 3, 3, 2, 2, 4, 3, 2, 3, 3, 2, 2, 2, 3, 3, 2, 4, 4, 2, 2, 3, 3, 2, 2, 2, 3, 4, 2, 2, 4, 3, 2, 3, 3, 2, 3, 3, 3, 3, 2, 2, 2, 2, 2, 5, 4, 3, 3, 2, 3, 3, 2, 2, 2, 2, 2, 4, 3, 3, 3, 2, 5, 4, 2, 2, 4, 3, 2, 3, 3]

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