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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.

A287865 a(n) = gpf(2*a(n-1)+1), with a(1)=1, where gpf = A006530.

Table of values

n a(n)
1 1
2 3
3 7
4 5
5 11
6 23
7 47
8 19
9 13
10 3
11 7
12 5
13 11
14 23
15 47
16 19
17 13
18 3
19 7
20 5
21 11
22 23
23 47
24 19
25 13
26 3
27 7
28 5
29 11
30 23
31 47
32 19
33 13
34 3
35 7
36 5
37 11
38 23
39 47
40 19
41 13
42 3
43 7
44 5
45 11
46 23
47 47
48 19
49 13
50 3
51 7
52 5
53 11
54 23
55 47
56 19
57 13
58 3
59 7
60 5
61 11
62 23
63 47
64 19
65 13
66 3
67 7
68 5
69 11
70 23
71 47
72 19
73 13
74 3
75 7
76 5

List of values

[1, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5, 11, 23, 47, 19, 13, 3, 7, 5]

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