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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.

A332425 If n = Product (p_j^k_j) then a(n) = Sum ((-1)^(pi(p_j) + 1) * p_j * k_j), where pi = A000720.

Table of values

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

List of values

[0, 2, -3, 4, 5, -1, -7, 6, -6, 7, 11, 1, -13, -5, 2, 8, 17, -4, -19, 9, -10, 13, 23, 3, 10, -11, -9, -3, -29, 4, 31, 10, 8, 19, -2, -2, -37, -17, -16, 11, 41, -8, -43, 15, -1, 25, 47, 5, -14, 12, 14, -9, -53, -7, 16, -1, -22, -27, 59, 6, -61, 33, -13, 12, -8, 10, 67, 21, 20]

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