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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.

A351445 a(n) = A003958(sigma(n)) - A003958(n), where A003958 is multiplicative with a(p^e) = (p-1)^e and sigma is the sum of divisors function.

Table of values

n a(n)
1 0
2 1
3 -1
4 5
5 -2
6 0
7 -5
8 7
9 8
10 0
11 -8
12 4
13 -6
14 -4
15 -6
16 29
17 -12
18 20
19 -14
20 8
21 -11
22 -6
23 -20
24 6
25 14
26 0
27 -4
28 0
29 -20
30 -4
31 -29
32 23
33 -18
34 -8
35 -22
36 68
37 -18
38 -10
39 -18
40 12
41 -28
42 -10
43 -32
44 2
45 8
46 -18
47 -44
48 28
49 0
50 44
51 -28
52 24
53 -44
54 0
55 -36
56 2
57 -32
58 -12
59 -50
60 4
61 -30
62 -28
63 -12
64 125
65 -36
66 -16
67 -50
68 8
69 -42
70 -20
71 -66
72 92
73 -36
74 0

List of values

[0, 1, -1, 5, -2, 0, -5, 7, 8, 0, -8, 4, -6, -4, -6, 29, -12, 20, -14, 8, -11, -6, -20, 6, 14, 0, -4, 0, -20, -4, -29, 23, -18, -8, -22, 68, -18, -10, -18, 12, -28, -10, -32, 2, 8, -18, -44, 28, 0, 44, -28, 24, -44, 0, -36, 2, -32, -12, -50, 4, -30, -28, -12, 125, -36, -16, -50, 8, -42, -20, -66, 92, -36, 0]

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