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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.

A374941 a(n) = (sum of proper prime factors of n) + Sum_{d = proper composite factor of n} a(d).

Table of values

n a(n)
1 0
2 0
3 0
4 2
5 0
6 5
7 0
8 4
9 3
10 7
11 0
12 12
13 0
14 9
15 8
16 8
17 0
18 13
19 0
20 16
21 10
22 13
23 0
24 28
25 5
26 15
27 6
28 20
29 0
30 30
31 0
32 16
33 14
34 19
35 12
36 40
37 0
38 21
39 16
40 36
41 0
42 36
43 0
44 28
45 19
46 25
47 0
48 64
49 7
50 19
51 20
52 32
53 0
54 32
55 16
56 44
57 22
58 31
59 0
60 90
61 0
62 33
63 23
64 32
65 18
66 48
67 0
68 40
69 26
70 42
71 0
72 112
73 0
74 39

List of values

[0, 0, 0, 2, 0, 5, 0, 4, 3, 7, 0, 12, 0, 9, 8, 8, 0, 13, 0, 16, 10, 13, 0, 28, 5, 15, 6, 20, 0, 30, 0, 16, 14, 19, 12, 40, 0, 21, 16, 36, 0, 36, 0, 28, 19, 25, 0, 64, 7, 19, 20, 32, 0, 32, 16, 44, 22, 31, 0, 90, 0, 33, 23, 32, 18, 48, 0, 40, 26, 42, 0, 112, 0, 39]

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