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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.

A098268 Unique prime factors of 2^n+1 are of the form kn+1. These are the values for k.

Table of values

n a(n)
1 2
2 2
3 0
4 4
5 2
6 2
7 6
8 32
9 2
10 4
11 62
12 20
13 210
14 2
15 8
16 22
17 4096
18 2570
19 2
20 6
21 9198
22 3084
23 258
24 18
25 96
26 121574
27 4
28 28
29 10
30 162
31 2
32 6
33 62
34 3230
35 563940
36 2
37 104592
38 2
39 44
40 23091222

List of values

[2, 2, 0, 4, 2, 2, 6, 32, 2, 4, 62, 20, 210, 2, 8, 22, 4096, 2570, 2, 6, 9198, 3084, 258, 18, 96, 121574, 4, 28, 10, 162, 2, 6, 62, 3230, 563940, 2, 104592, 2, 44, 23091222]

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

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