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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.

A209291 Sum of the refactorable numbers less than or equal to n.

Table of values

n a(n)
1 1
2 3
3 3
4 3
5 3
6 3
7 3
8 11
9 20
10 20
11 20
12 32
13 32
14 32
15 32
16 32
17 32
18 50
19 50
20 50
21 50
22 50
23 50
24 74
25 74
26 74
27 74
28 74
29 74
30 74
31 74
32 74
33 74
34 74
35 74
36 110
37 110
38 110
39 110
40 150
41 150
42 150
43 150
44 150
45 150
46 150
47 150
48 150
49 150
50 150
51 150
52 150
53 150
54 150
55 150
56 206
57 206
58 206
59 206
60 266

List of values

[1, 3, 3, 3, 3, 3, 3, 11, 20, 20, 20, 32, 32, 32, 32, 32, 32, 50, 50, 50, 50, 50, 50, 74, 74, 74, 74, 74, 74, 74, 74, 74, 74, 74, 74, 110, 110, 110, 110, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 206, 206, 206, 206, 266]

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

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