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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.

A179289 Smallest index k such that prime(k)*2^n-1 is prime, or zero if there is no prime.

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 4
6 1
7 2
8 3
9 4
10 3
11 2
12 1
13 11
14 3
15 22
16 1
17 4
18 1
19 18
20 7
21 4
22 23
23 6
24 23
25 18
26 5
27 44
28 23
29 4
30 1
31 14
32 3
33 11
34 2
35 11
36 7
37 11
38 2
39 18
40 28
41 8
42 16
43 2
44 102
45 4
46 9
47 11
48 3
49 8
50 5
51 174
52 24
53 63
54 3
55 2
56 103
57 22
58 23
59 130
60 1
61 22
62 16
63 18
64 2
65 19
66 55
67 14
68 41
69 34
70 15

List of values

[1, 1, 2, 1, 4, 1, 2, 3, 4, 3, 2, 1, 11, 3, 22, 1, 4, 1, 18, 7, 4, 23, 6, 23, 18, 5, 44, 23, 4, 1, 14, 3, 11, 2, 11, 7, 11, 2, 18, 28, 8, 16, 2, 102, 4, 9, 11, 3, 8, 5, 174, 24, 63, 3, 2, 103, 22, 23, 130, 1, 22, 16, 18, 2, 19, 55, 14, 41, 34, 15]

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