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.

A318501 a(n) = SumXOR_{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 20
19 1
20 23
21 11
22 14
23 1
24 39
25 6
26 16
27 13
28 29
29 1
30 43
31 1
32 31
33 15
34 20
35 13
36 49
37 1
38 22
39 17
40 49
41 1
42 55
43 1
44 41
45 32
46 26
47 1
48 75
49 8
50 42
51 21
52 47
53 1
54 70
55 17
56 67
57 23
58 32
59 1
60 97
61 1
62 34
63 40
64 63
65 19
66 79
67 1
68 59
69 27
70 75
71 1
72 107
73 1
74 40
75 48
76 65
77 19
78 91
79 1
80 109
81 40
82 44
83 1
84 131
85 23
86 46
87 33
88 95
89 1
90 155
91 21

List of values

[0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 17, 1, 10, 9, 15, 1, 20, 1, 23, 11, 14, 1, 39, 6, 16, 13, 29, 1, 43, 1, 31, 15, 20, 13, 49, 1, 22, 17, 49, 1, 55, 1, 41, 32, 26, 1, 75, 8, 42, 21, 47, 1, 70, 17, 67, 23, 32, 1, 97, 1, 34, 40, 63, 19, 79, 1, 59, 27, 75, 1, 107, 1, 40, 48, 65, 19, 91, 1, 109, 40, 44, 1, 131, 23, 46, 33, 95, 1, 155, 21]