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.

A063845 a(n) = sigma(usigma(n)), where usigma(n) is the sum of unitary divisors of n (A034448) and sigma(n) is the sum of the divisors (A000203).

Table of values

n a(n)
1 1
2 4
3 7
4 6
5 12
6 28
7 15
8 13
9 18
10 39
11 28
12 42
13 24
14 60
15 60
16 18
17 39
18 72
19 42
20 72
21 63
22 91
23 60
24 91
25 42
26 96
27 56
28 90
29 72
30 195
31 63
32 48
33 124
34 120
35 124
36 93
37 60
38 168
39 120
40 120
41 96
42 252
43 84
44 168
45 168
46 195
47 124
48 126
49 93
50 168
51 195
52 144
53 120
54 224
55 195
56 195
57 186

List of values

[1, 4, 7, 6, 12, 28, 15, 13, 18, 39, 28, 42, 24, 60, 60, 18, 39, 72, 42, 72, 63, 91, 60, 91, 42, 96, 56, 90, 72, 195, 63, 48, 124, 120, 124, 93, 60, 168, 120, 120, 96, 252, 84, 168, 168, 195, 124, 126, 93, 168, 195, 144, 120, 224, 195, 195, 186]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.