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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.

A257379 Smallest odd number k such that k*n*2^n - 1 is a prime number.

Table of values

n a(n)
1 3
2 1
3 1
4 3
5 3
6 1
7 3
8 3
9 5
10 5
11 9
12 5
13 7
14 7
15 3
16 17
17 11
18 11
19 7
20 9
21 11
22 15
23 3
24 7
25 9
26 67
27 3
28 45
29 3
30 1
31 33
32 21
33 15
34 23
35 17
36 3
37 7
38 9
39 19
40 15
41 17
42 63
43 51
44 3
45 9
46 33
47 53
48 61
49 13
50 45
51 75
52 39
53 83
54 43
55 7
56 19
57 13
58 41
59 5
60 19
61 31
62 165
63 13
64 27
65 3
66 13
67 135
68 33
69 31
70 15
71 33
72 87

List of values

[3, 1, 1, 3, 3, 1, 3, 3, 5, 5, 9, 5, 7, 7, 3, 17, 11, 11, 7, 9, 11, 15, 3, 7, 9, 67, 3, 45, 3, 1, 33, 21, 15, 23, 17, 3, 7, 9, 19, 15, 17, 63, 51, 3, 9, 33, 53, 61, 13, 45, 75, 39, 83, 43, 7, 19, 13, 41, 5, 19, 31, 165, 13, 27, 3, 13, 135, 33, 31, 15, 33, 87]

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

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