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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.

A102440 Replace each prime factor of n that is greater than 3 with the greatest semiprime less than it.

Table of values

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

List of values

[1, 2, 3, 4, 4, 6, 6, 8, 9, 8, 10, 12, 10, 12, 12, 16, 15, 18, 15, 16, 18, 20, 22, 24, 16, 20, 27, 24, 26, 24, 26, 32, 30, 30, 24, 36, 35, 30, 30, 32, 39, 36, 39, 40, 36, 44, 46, 48, 36, 32, 45, 40, 51, 54, 40, 48, 45, 52, 58, 48, 58, 52, 54, 64, 40, 60, 65, 60, 66, 48, 69, 72, 69]

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

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