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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.

A216157 Difference between the sum of the even divisors and the sum of the odd divisors of phi(n).

Table of values

n a(n)
3 1
4 1
5 5
6 1
7 4
8 5
9 4
10 5
11 6
12 5
13 20
14 4
15 13
16 13
17 29
18 4
19 13
20 13
21 20
22 6
23 12
24 13
25 30
26 20
27 13
28 20
29 40
30 13
31 24
32 29
33 30
34 29
35 52
36 20
37 65
38 13
39 52
40 29
41 78
42 20
43 32
44 30
45 52
46 12
47 24
48 29
49 32
50 30
51 61
52 52
53 70
54 13
55 78
56 52
57 65
58 40
59 30
60 29
61 120
62 24
63 65
64 61
65 116
66 30
67 48
68 61
69 60
70 52

List of values

[1, 1, 5, 1, 4, 5, 4, 5, 6, 5, 20, 4, 13, 13, 29, 4, 13, 13, 20, 6, 12, 13, 30, 20, 13, 20, 40, 13, 24, 29, 30, 29, 52, 20, 65, 13, 52, 29, 78, 20, 32, 30, 52, 12, 24, 29, 32, 30, 61, 52, 70, 13, 78, 52, 65, 40, 30, 29, 120, 24, 65, 61, 116, 30, 48, 61, 60, 52]

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

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