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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.

A161670 Sum of largest prime factor of composite(k) for k from smallest prime factor of composite(n) to largest prime factor of composite(n).

Table of values

n a(n)
1 3
2 5
3 3
4 2
5 13
6 5
7 23
8 10
9 3
10 5
11 13
12 20
13 38
14 5
15 5
16 56
17 2
18 23
19 13
20 3
21 35
22 80
23 15
24 5
25 92
26 53
27 13
28 23
29 38
30 10
31 129
32 5
33 7
34 13
35 77
36 56
37 5
38 30
39 23
40 89
41 187
42 13
43 215
44 20
45 3
46 48
47 38
48 80
49 126
50 23
51 5
52 263
53 10
54 92
55 22
56 56
57 13
58 2
59 329
60 23
61 72
62 365
63 184
64 38
65 13
66 40
67 129
68 212
69 398
70 84
71 5
72 23
73 35

List of values

[3, 5, 3, 2, 13, 5, 23, 10, 3, 5, 13, 20, 38, 5, 5, 56, 2, 23, 13, 3, 35, 80, 15, 5, 92, 53, 13, 23, 38, 10, 129, 5, 7, 13, 77, 56, 5, 30, 23, 89, 187, 13, 215, 20, 3, 48, 38, 80, 126, 23, 5, 263, 10, 92, 22, 56, 13, 2, 329, 23, 72, 365, 184, 38, 13, 40, 129, 212, 398, 84, 5, 23, 35]

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

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