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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.

A086670 Sum of floor(d/2) where d is a divisor of n.

Table of values

n a(n)
1 0
2 1
3 1
4 3
5 2
6 5
7 3
8 7
9 5
10 8
11 5
12 13
13 6
14 11
15 10
16 15
17 8
18 18
19 9
20 20
21 14
22 17
23 11
24 29
25 14
26 20
27 18
28 27
29 14
30 34
31 15
32 31
33 22
34 26
35 22
36 44
37 18
38 29
39 26
40 44
41 20
42 46
43 21
44 41
45 36
46 35
47 23
48 61
49 27
50 45
51 34
52 48
53 26
54 58
55 34
56 59
57 38
58 44
59 29
60 82
61 30
62 47
63 49
64 63
65 40
66 70
67 33
68 62
69 46
70 70
71 35
72 96
73 36
74 56

List of values

[0, 1, 1, 3, 2, 5, 3, 7, 5, 8, 5, 13, 6, 11, 10, 15, 8, 18, 9, 20, 14, 17, 11, 29, 14, 20, 18, 27, 14, 34, 15, 31, 22, 26, 22, 44, 18, 29, 26, 44, 20, 46, 21, 41, 36, 35, 23, 61, 27, 45, 34, 48, 26, 58, 34, 59, 38, 44, 29, 82, 30, 47, 49, 63, 40, 70, 33, 62, 46, 70, 35, 96, 36, 56]

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