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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.

A257378 Smallest odd number k such that k*n*2^n+1 is a prime number.

Table of values

n a(n)
1 1
2 5
3 3
4 3
5 13
6 3
7 3
8 9
9 5
10 13
11 9
12 3
13 3
14 5
15 9
16 7
17 3
18 3
19 3
20 5
21 3
22 7
23 19
24 5
25 5
26 33
27 3
28 7
29 7
30 9
31 5
32 15
33 3
34 21
35 15
36 7
37 35
38 89
39 25
40 15
41 25
42 49
43 53
44 45
45 13
46 15
47 21
48 31
49 27
50 3
51 9
52 33
53 37
54 23
55 41
56 41
57 19
58 9
59 111
60 7
61 3
62 89
63 13
64 39
65 31
66 17
67 11
68 101
69 17
70 37
71 7
72 51
73 75

List of values

[1, 5, 3, 3, 13, 3, 3, 9, 5, 13, 9, 3, 3, 5, 9, 7, 3, 3, 3, 5, 3, 7, 19, 5, 5, 33, 3, 7, 7, 9, 5, 15, 3, 21, 15, 7, 35, 89, 25, 15, 25, 49, 53, 45, 13, 15, 21, 31, 27, 3, 9, 33, 37, 23, 41, 41, 19, 9, 111, 7, 3, 89, 13, 39, 31, 17, 11, 101, 17, 37, 7, 51, 75]

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

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