cp's OEIS Frontend

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.

A328181 a(n) = (-1)^(bigomega(n) - omega(n)) * Sum_{d|n} (-1)^(bigomega(d) - omega(d)) * d.

Table of values

n a(n)
1 1
2 3
3 4
4 1
5 6
6 12
7 8
8 7
9 5
10 18
11 12
12 4
13 14
14 24
15 24
16 9
17 18
18 15
19 20
20 6
21 32
22 36
23 24
24 28
25 19
26 42
27 22
28 8
29 30
30 72
31 32
32 23
33 48
34 54
35 48
36 5
37 38
38 60
39 56
40 42
41 42
42 96
43 44
44 12
45 30
46 72
47 48
48 36
49 41
50 57
51 72
52 14
53 54
54 66
55 72
56 56
57 80
58 90
59 60
60 24
61 62
62 96
63 40
64 41
65 84
66 144
67 68
68 18
69 96
70 144

List of values

[1, 3, 4, 1, 6, 12, 8, 7, 5, 18, 12, 4, 14, 24, 24, 9, 18, 15, 20, 6, 32, 36, 24, 28, 19, 42, 22, 8, 30, 72, 32, 23, 48, 54, 48, 5, 38, 60, 56, 42, 42, 96, 44, 12, 30, 72, 48, 36, 41, 57, 72, 14, 54, 66, 72, 56, 80, 90, 60, 24, 62, 96, 40, 41, 84, 144, 68, 18, 96, 144]