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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.

A368457 a(n) = 2*(Bacher(n) - sigma(n)) + n + 1 = 2*(A368207(n) - A000203(n)) + n + 1.

Table of values

n a(n)
1 2
2 1
3 0
4 1
5 0
6 -1
7 0
8 -5
9 2
10 -7
11 0
12 -7
13 0
14 -9
15 -4
16 -7
17 0
18 -19
19 0
20 -9
21 -10
22 -13
23 0
24 -27
25 4
26 -15
27 -12
28 -23
29 0
30 -25
31 0
32 -29
33 -14
34 -19
35 0
36 -43
37 0
38 -21
39 -16
40 -41
41 0
42 -33
43 0
44 -39
45 -28
46 -25
47 0
48 -59
49 6
50 -41
51 -20
52 -45
53 0
54 -53
55 -16
56 -39
57 -22
58 -31
59 0
60 -99
61 0
62 -33
63 -20

List of values

[2, 1, 0, 1, 0, -1, 0, -5, 2, -7, 0, -7, 0, -9, -4, -7, 0, -19, 0, -9, -10, -13, 0, -27, 4, -15, -12, -23, 0, -25, 0, -29, -14, -19, 0, -43, 0, -21, -16, -41, 0, -33, 0, -39, -28, -25, 0, -59, 6, -41, -20, -45, 0, -53, -16, -39, -22, -31, 0, -99, 0, -33, -20]

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