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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.

A031441 a(0) = 3; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

Table of values

n a(n)
0 3
1 5
2 7
3 17
4 11
5 19
6 23
7 109
8 17
9 11
10 19
11 23
12 109
13 17
14 11
15 19
16 23
17 109
18 17
19 11
20 19
21 23
22 109
23 17
24 11
25 19
26 23
27 109
28 17
29 11
30 19
31 23
32 109
33 17
34 11
35 19
36 23
37 109
38 17
39 11
40 19
41 23
42 109
43 17
44 11
45 19
46 23
47 109
48 17
49 11
50 19
51 23
52 109
53 17
54 11
55 19
56 23
57 109
58 17
59 11
60 19
61 23
62 109
63 17
64 11
65 19
66 23

List of values

[3, 5, 7, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23, 109, 17, 11, 19, 23]

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