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.

A189240 Least number k such that 2*k*n + 1 is a prime dividing 3^n + 1.

Table of values

n a(n)
2 1
3 1
4 5
5 6
6 6
7 39
8 1
9 1
10 59
11 3
12 270
13 15330
14 1
15 1
16 672605
17 3
18 2
19 75
20 1
21 1
22 125
23 511647711
24 2
25 3
26 1
27 360
28 7691
29 9
30 796056
31 111
32 14476720225405
33 1
34 14064
35 5355114024
36 90
37 249
38 69757
39 1
40 180

List of values

[1, 1, 5, 6, 6, 39, 1, 1, 59, 3, 270, 15330, 1, 1, 672605, 3, 2, 75, 1, 1, 125, 511647711, 2, 3, 1, 360, 7691, 9, 796056, 111, 14476720225405, 1, 14064, 5355114024, 90, 249, 69757, 1, 180]