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.

A337180 a(n) = Sum_{d|n} d * gcd(d,n/d).

Table of values

n a(n)
1 1
2 3
3 4
4 9
5 6
6 12
7 8
8 21
9 19
10 18
11 12
12 36
13 14
14 24
15 24
16 53
17 18
18 57
19 20
20 54
21 32
22 36
23 24
24 84
25 51
26 42
27 64
28 72
29 30
30 72
31 32
32 117
33 48
34 54
35 48
36 171
37 38
38 60
39 56
40 126
41 42
42 96
43 44
44 108
45 114
46 72
47 48
48 212
49 99
50 153
51 72
52 126
53 54
54 192
55 72
56 168
57 80
58 90
59 60
60 216
61 62
62 96
63 152
64 277
65 84
66 144

List of values

[1, 3, 4, 9, 6, 12, 8, 21, 19, 18, 12, 36, 14, 24, 24, 53, 18, 57, 20, 54, 32, 36, 24, 84, 51, 42, 64, 72, 30, 72, 32, 117, 48, 54, 48, 171, 38, 60, 56, 126, 42, 96, 44, 108, 114, 72, 48, 212, 99, 153, 72, 126, 54, 192, 72, 168, 80, 90, 60, 216, 62, 96, 152, 277, 84, 144]