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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.

A071939 a(n) = Max { sigma(k) : k = 1, 2, 3, ..., n } - Max { Phi(k) : k = 1, 2, 3, ..., n }.

Table of values

n a(n)
1 0
2 2
3 2
4 5
5 3
6 8
7 6
8 9
9 9
10 12
11 8
12 18
13 16
14 16
15 16
16 19
17 15
18 23
19 21
20 24
21 24
22 24
23 20
24 38
25 38
26 38
27 38
28 38
29 32
30 44
31 42
32 42
33 42
34 42
35 42
36 61
37 55
38 55
39 55
40 55
41 51
42 56
43 54
44 54
45 54
46 54
47 50
48 78
49 78
50 78
51 78
52 78
53 72
54 72
55 72
56 72
57 72
58 72
59 66
60 110
61 108
62 108
63 108
64 108
65 108
66 108
67 102
68 102
69 102

List of values

[0, 2, 2, 5, 3, 8, 6, 9, 9, 12, 8, 18, 16, 16, 16, 19, 15, 23, 21, 24, 24, 24, 20, 38, 38, 38, 38, 38, 32, 44, 42, 42, 42, 42, 42, 61, 55, 55, 55, 55, 51, 56, 54, 54, 54, 54, 50, 78, 78, 78, 78, 78, 72, 72, 72, 72, 72, 72, 66, 110, 108, 108, 108, 108, 108, 108, 102, 102, 102]

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

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