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.

A318325 a(n) = Sum_{d|n} [moebius(n/d) > 0]*(sigma(d)-d).

Table of values

n a(n)
1 0
2 1
3 1
4 3
5 1
6 6
7 1
8 7
9 4
10 8
11 1
12 17
13 1
14 10
15 9
16 15
17 1
18 22
19 1
20 23
21 11
22 14
23 1
24 39
25 6
26 16
27 13
28 29
29 1
30 45
31 1
32 31
33 15
34 20
35 13
36 61
37 1
38 22
39 17
40 53
41 1
42 57
43 1
44 41
45 34
46 26
47 1
48 83
49 8
50 44
51 21
52 47
53 1
54 70
55 17
56 67
57 23
58 32
59 1
60 125
61 1
62 34
63 42
64 63
65 19
66 81
67 1
68 59
69 27
70 77
71 1
72 139
73 1
74 40
75 50
76 65
77 19
78 93
79 1
80 113
81 40
82 44
83 1
84 159
85 23
86 46
87 33
88 95
89 1
90 163
91 21

List of values

[0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 17, 1, 10, 9, 15, 1, 22, 1, 23, 11, 14, 1, 39, 6, 16, 13, 29, 1, 45, 1, 31, 15, 20, 13, 61, 1, 22, 17, 53, 1, 57, 1, 41, 34, 26, 1, 83, 8, 44, 21, 47, 1, 70, 17, 67, 23, 32, 1, 125, 1, 34, 42, 63, 19, 81, 1, 59, 27, 77, 1, 139, 1, 40, 50, 65, 19, 93, 1, 113, 40, 44, 1, 159, 23, 46, 33, 95, 1, 163, 21]