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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.

A284444 a(n) = Sum_{d|n, d == 3 (mod 7)} d.

Table of values

n a(n)
1 0
2 0
3 3
4 0
5 0
6 3
7 0
8 0
9 3
10 10
11 0
12 3
13 0
14 0
15 3
16 0
17 17
18 3
19 0
20 10
21 3
22 0
23 0
24 27
25 0
26 0
27 3
28 0
29 0
30 13
31 31
32 0
33 3
34 17
35 0
36 3
37 0
38 38
39 3
40 10
41 0
42 3
43 0
44 0
45 48
46 0
47 0
48 27
49 0
50 10
51 20
52 52
53 0
54 3
55 0
56 0
57 3
58 0
59 59
60 13
61 0
62 31
63 3
64 0
65 0
66 69
67 0
68 17
69 3
70 10
71 0
72 27
73 73
74 0
75 3
76 38
77 0
78 3
79 0
80 90
81 3

List of values

[0, 0, 3, 0, 0, 3, 0, 0, 3, 10, 0, 3, 0, 0, 3, 0, 17, 3, 0, 10, 3, 0, 0, 27, 0, 0, 3, 0, 0, 13, 31, 0, 3, 17, 0, 3, 0, 38, 3, 10, 0, 3, 0, 0, 48, 0, 0, 27, 0, 10, 20, 52, 0, 3, 0, 0, 3, 0, 59, 13, 0, 31, 3, 0, 0, 69, 0, 17, 3, 10, 0, 27, 73, 0, 3, 38, 0, 3, 0, 90, 3]

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