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.

A126659 Least number k > 0 such that ((2n-1)^k + 1)/(2n) is prime, or 0 if no such prime exists.

Table of values

n a(n)
2 3
3 5
4 3
5 3
6 5
7 3
8 3
9 7
10 17
11 3
12 11
13 3
14 0
15 7
16 109
17 5
18 11
19 5
20 3
21 17
22 5
23 103
24 5
25 7
26 3
27 21943
28 3
29 53
30 17
31 7
32 3
33 19
34 3
35 11
36 5
37 7
38 5
39 37
40 3
41 3
42 19
43 167
44 7
45 13
46 3
47 89
48 43

List of values

[3, 5, 3, 3, 5, 3, 3, 7, 17, 3, 11, 3, 0, 7, 109, 5, 11, 5, 3, 17, 5, 103, 5, 7, 3, 21943, 3, 53, 17, 7, 3, 19, 3, 11, 5, 7, 5, 37, 3, 3, 19, 167, 7, 13, 3, 89, 43]