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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.

A330492 a(n) = sum of second differences of the sorted divisors of n.

Table of values

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

List of values

[0, 0, 1, 0, 2, 0, 3, 4, 4, 0, 5, 0, 6, 8, 7, 0, 8, 0, 9, 12, 10, 0, 11, 16, 12, 16, 13, 0, 14, 0, 15, 20, 16, 24, 17, 0, 18, 24, 19, 0, 20, 0, 21, 28, 22, 0, 23, 36, 24, 32, 25, 0, 26, 40, 27, 36, 28, 0, 29, 0, 30, 40, 31, 48, 32, 0, 33, 44, 34, 0, 35, 0, 36]

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

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