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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.

A244433 a(n) is the smallest number m such that 2im+1 is composite for all i, 0

Table of values

n a(n)
1 4
2 12
3 19
4 19
5 59
6 92
7 159
8 159
9 159
10 227
11 227
12 256
13 256
14 256
15 514
16 514
17 706
18 706
19 706
20 706
21 706
22 706
23 706
24 1466
25 1466
26 1466
27 1466
28 1466
29 1466
30 5207
31 5207
32 5207
33 5207
34 5207
35 5207
36 5207
37 5207
38 5207
39 5207
40 5207
41 5207
42 21209
43 21209
44 21209
45 21209
46 21209
47 21209
48 21209
49 21209
50 21209
51 21209
52 21209
53 21209
54 62809
55 62809
56 62809
57 86914
58 86914
59 86914
60 152351

List of values

[4, 12, 19, 19, 59, 92, 159, 159, 159, 227, 227, 256, 256, 256, 514, 514, 706, 706, 706, 706, 706, 706, 706, 1466, 1466, 1466, 1466, 1466, 1466, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 62809, 62809, 62809, 86914, 86914, 86914, 152351]