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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.

A070318 a(n) = Max_{k=1..n} (sigma(k)-k) where sigma(k)-k is the sum of proper divisors of k.

Table of values

n a(n)
1 0
2 1
3 1
4 3
5 3
6 6
7 6
8 7
9 7
10 8
11 8
12 16
13 16
14 16
15 16
16 16
17 16
18 21
19 21
20 22
21 22
22 22
23 22
24 36
25 36
26 36
27 36
28 36
29 36
30 42
31 42
32 42
33 42
34 42
35 42
36 55
37 55
38 55
39 55
40 55
41 55
42 55
43 55
44 55
45 55
46 55
47 55
48 76
49 76
50 76
51 76
52 76
53 76
54 76
55 76
56 76
57 76
58 76
59 76
60 108
61 108
62 108
63 108
64 108
65 108
66 108
67 108
68 108
69 108

List of values

[0, 1, 1, 3, 3, 6, 6, 7, 7, 8, 8, 16, 16, 16, 16, 16, 16, 21, 21, 22, 22, 22, 22, 36, 36, 36, 36, 36, 36, 42, 42, 42, 42, 42, 42, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 76, 76, 76, 76, 76, 76, 76, 76, 76, 76, 76, 76, 108, 108, 108, 108, 108, 108, 108, 108, 108, 108]

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

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