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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.

A253139 a(n) = lcm_{d|n} tau(d), where tau(d) represents the number of divisors of d (A000005(d)).

Table of values

n a(n)
1 1
2 2
3 2
4 6
5 2
6 4
7 2
8 12
9 6
10 4
11 2
12 12
13 2
14 4
15 4
16 60
17 2
18 12
19 2
20 12
21 4
22 4
23 2
24 24
25 6
26 4
27 12
28 12
29 2
30 8
31 2
32 60
33 4
34 4
35 4
36 36
37 2
38 4
39 4
40 24
41 2
42 8
43 2
44 12
45 12
46 4
47 2
48 120
49 6
50 12
51 4
52 12
53 2
54 24
55 4
56 24
57 4
58 4
59 2
60 24
61 2
62 4
63 12
64 420
65 4
66 8
67 2
68 12
69 4
70 8
71 2
72 72
73 2
74 4
75 12
76 12
77 4
78 8

List of values

[1, 2, 2, 6, 2, 4, 2, 12, 6, 4, 2, 12, 2, 4, 4, 60, 2, 12, 2, 12, 4, 4, 2, 24, 6, 4, 12, 12, 2, 8, 2, 60, 4, 4, 4, 36, 2, 4, 4, 24, 2, 8, 2, 12, 12, 4, 2, 120, 6, 12, 4, 12, 2, 24, 4, 24, 4, 4, 2, 24, 2, 4, 12, 420, 4, 8, 2, 12, 4, 8, 2, 72, 2, 4, 12, 12, 4, 8]

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