cp's OEIS Frontend

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.

A247202 Smallest odd k > 1 such that k*2^n - 1 is a prime number.

Table of values

n a(n)
1 3
2 3
3 3
4 3
5 7
6 3
7 3
8 5
9 7
10 5
11 3
12 5
13 9
14 5
15 9
16 17
17 7
18 3
19 51
20 17
21 7
22 33
23 13
24 39
25 57
26 11
27 21
28 27
29 7
30 213
31 15
32 5
33 31
34 3
35 25
36 17
37 21
38 3
39 25
40 107
41 15
42 33
43 3
44 35
45 7
46 23
47 31
48 5
49 19
50 11
51 21
52 65
53 147
54 5
55 3
56 33
57 51
58 77
59 45
60 17
61 69
62 53
63 9
64 3
65 67
66 63
67 43
68 63
69 51
70 27
71 73
72 5

List of values

[3, 3, 3, 3, 7, 3, 3, 5, 7, 5, 3, 5, 9, 5, 9, 17, 7, 3, 51, 17, 7, 33, 13, 39, 57, 11, 21, 27, 7, 213, 15, 5, 31, 3, 25, 17, 21, 3, 25, 107, 15, 33, 3, 35, 7, 23, 31, 5, 19, 11, 21, 65, 147, 5, 3, 33, 51, 77, 45, 17, 69, 53, 9, 3, 67, 63, 43, 63, 51, 27, 73, 5]

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

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