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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.

A033879 Deficiency of n, or 2n - (sum of divisors of n).

Table of values

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

List of values

[1, 1, 2, 1, 4, 0, 6, 1, 5, 2, 10, -4, 12, 4, 6, 1, 16, -3, 18, -2, 10, 8, 22, -12, 19, 10, 14, 0, 28, -12, 30, 1, 18, 14, 22, -19, 36, 16, 22, -10, 40, -12, 42, 4, 12, 20, 46, -28, 41, 7, 30, 6, 52, -12, 38, -8, 34, 26, 58, -48, 60, 28, 22, 1, 46, -12, 66, 10, 42, -4, 70, -51]

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