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.

A215947 Difference between the sum of the even divisors and the sum of the odd divisors of 2n.

Table of values

n a(n)
1 1
2 5
3 4
4 13
5 6
6 20
7 8
8 29
9 13
10 30
11 12
12 52
13 14
14 40
15 24
16 61
17 18
18 65
19 20
20 78
21 32
22 60
23 24
24 116
25 31
26 70
27 40
28 104
29 30
30 120
31 32
32 125
33 48
34 90
35 48
36 169
37 38
38 100
39 56
40 174
41 42
42 160
43 44
44 156
45 78
46 120
47 48
48 244
49 57
50 155
51 72
52 182
53 54
54 200
55 72
56 232
57 80
58 150
59 60
60 312
61 62
62 160

List of values

[1, 5, 4, 13, 6, 20, 8, 29, 13, 30, 12, 52, 14, 40, 24, 61, 18, 65, 20, 78, 32, 60, 24, 116, 31, 70, 40, 104, 30, 120, 32, 125, 48, 90, 48, 169, 38, 100, 56, 174, 42, 160, 44, 156, 78, 120, 48, 244, 57, 155, 72, 182, 54, 200, 72, 232, 80, 150, 60, 312, 62, 160]

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

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