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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.

A229087 a(n) = sigma(n) mod n - antisigma(n) mod n, where sigma(n) = A000203(n) = sum of divisor of n, antisigma(n) = A024816(n) = sum of non-divisors of n.

Table of values

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

List of values

[0, 1, -1, 0, -3, -3, -5, 2, -1, 1, -9, 2, -11, -1, 3, 6, -15, -3, -17, -6, 1, -5, -21, 12, -13, -7, -1, -14, -27, 9, -29, 14, -3, -11, -9, -16, -35, -13, -5, 0, -39, 3, -41, 14, 21, -17, -45, -16, -33, 11, -9, 14, -51, -3, -21, -12, -11, -23, -57, 6, -59, -25]

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