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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.

A130064 a(n) = (n / SmallestPrimeFactor(n)) * GreatestPrimeFactor(n).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 9
7 7
8 8
9 9
10 25
11 11
12 18
13 13
14 49
15 25
16 16
17 17
18 27
19 19
20 50
21 49
22 121
23 23
24 36
25 25
26 169
27 27
28 98
29 29
30 75
31 31
32 32
33 121
34 289
35 49
36 54
37 37
38 361
39 169
40 100
41 41
42 147
43 43
44 242
45 75
46 529
47 47
48 72
49 49
50 125
51 289
52 338
53 53
54 81
55 121
56 196
57 361
58 841
59 59
60 150
61 61
62 961
63 147
64 64
65 169
66 363

List of values

[1, 2, 3, 4, 5, 9, 7, 8, 9, 25, 11, 18, 13, 49, 25, 16, 17, 27, 19, 50, 49, 121, 23, 36, 25, 169, 27, 98, 29, 75, 31, 32, 121, 289, 49, 54, 37, 361, 169, 100, 41, 147, 43, 242, 75, 529, 47, 72, 49, 125, 289, 338, 53, 81, 121, 196, 361, 841, 59, 150, 61, 961, 147, 64, 169, 363]

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

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