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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.

A088839 Numerator of sigma(4n)/sigma(n).

Table of values

n a(n)
1 7
2 5
3 7
4 31
5 7
6 5
7 7
8 21
9 7
10 5
11 7
12 31
13 7
14 5
15 7
16 127
17 7
18 5
19 7
20 31
21 7
22 5
23 7
24 21
25 7
26 5
27 7
28 31
29 7
30 5
31 7
32 85
33 7
34 5
35 7
36 31
37 7
38 5
39 7
40 21
41 7
42 5
43 7
44 31
45 7
46 5
47 7
48 127
49 7
50 5
51 7
52 31
53 7
54 5
55 7
56 21
57 7
58 5
59 7
60 31
61 7
62 5
63 7
64 511
65 7
66 5
67 7
68 31
69 7
70 5
71 7
72 21
73 7
74 5
75 7
76 31
77 7
78 5
79 7
80 127
81 7
82 5
83 7
84 31
85 7
86 5
87 7
88 21
89 7
90 5
91 7
92 31

List of values

[7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31, 7, 5, 7, 127, 7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31, 7, 5, 7, 85, 7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31, 7, 5, 7, 127, 7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31, 7, 5, 7, 511, 7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31, 7, 5, 7, 127, 7, 5, 7, 31, 7, 5, 7, 21, 7, 5, 7, 31]

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

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