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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.

A284445 a(n) = Sum_{d|n, d == 4 (mod 7)} d.

Table of values

n a(n)
1 0
2 0
3 0
4 4
5 0
6 0
7 0
8 4
9 0
10 0
11 11
12 4
13 0
14 0
15 0
16 4
17 0
18 18
19 0
20 4
21 0
22 11
23 0
24 4
25 25
26 0
27 0
28 4
29 0
30 0
31 0
32 36
33 11
34 0
35 0
36 22
37 0
38 0
39 39
40 4
41 0
42 0
43 0
44 15
45 0
46 46
47 0
48 4
49 0
50 25
51 0
52 4
53 53
54 18
55 11
56 4
57 0
58 0
59 0
60 64
61 0
62 0
63 0
64 36
65 0
66 11
67 67
68 4
69 0
70 0
71 0
72 22
73 0
74 74
75 25
76 4
77 11
78 39
79 0
80 4
81 81

List of values

[0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 11, 4, 0, 0, 0, 4, 0, 18, 0, 4, 0, 11, 0, 4, 25, 0, 0, 4, 0, 0, 0, 36, 11, 0, 0, 22, 0, 0, 39, 4, 0, 0, 0, 15, 0, 46, 0, 4, 0, 25, 0, 4, 53, 18, 11, 4, 0, 0, 0, 64, 0, 0, 0, 36, 0, 11, 67, 4, 0, 0, 0, 22, 0, 74, 25, 4, 11, 39, 0, 4, 81]

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