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.

A340080 a(n) = (1+A018804(n)) / gcd(n, 1+A018804(n)), where A018804(n) = Sum_{k=1..n} gcd(k, n).

Table of values

n a(n)
1 2
2 2
3 2
4 9
5 2
6 8
7 2
8 21
9 22
10 14
11 2
12 41
13 2
14 20
15 46
16 49
17 2
18 32
19 2
20 73
21 22
22 32
23 2
24 101
25 66
26 38
27 82
28 15
29 2
30 68
31 2
32 113
33 106
34 50
35 118
36 169
37 2
38 56
39 42
40 181
41 2
42 14
43 2
44 169
45 38
46 68
47 2
48 241
49 134
50 98
51 166
52 201
53 2
54 122
55 38
56 261
57 62
58 86
59 2
60 361
61 2
62 92
63 274
64 257
65 226
66 158
67 2
68 265
69 226
70 176
71 2
72 421
73 2
74 110
75 326
76 297
77 274
78 188

List of values

[2, 2, 2, 9, 2, 8, 2, 21, 22, 14, 2, 41, 2, 20, 46, 49, 2, 32, 2, 73, 22, 32, 2, 101, 66, 38, 82, 15, 2, 68, 2, 113, 106, 50, 118, 169, 2, 56, 42, 181, 2, 14, 2, 169, 38, 68, 2, 241, 134, 98, 166, 201, 2, 122, 38, 261, 62, 86, 2, 361, 2, 92, 274, 257, 226, 158, 2, 265, 226, 176, 2, 421, 2, 110, 326, 297, 274, 188]