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.

A250200 Least number k>1 such that (2n-1)^k - 2 is prime, or 0 if no such number exists.

Table of values

n a(n)
1 0
2 2
3 2
4 2
5 2
6 4
7 2
8 2
9 6
10 2
11 2
12 24
13 7
14 2
15 2
16 3
17 2
18 2
19 2
20 4
21 4
22 2
23 11
24 2
25 2
26 8
27 4
28 2
29 12
30 4
31 2
32 2
33 8
34 3
35 2
36 2
37 4
38 2
39 2
40 38
41 130
42 4
43 4
44 4
45 2
46 3
47 2
48 4
49 747
50 3
51 4
52 2
53 10
54 2
55 3
56 17
57 10
58 13
59 2
60 2
61 2
62 6
63 42
64 2
65 3
66 2
67 6
68 2
69 10
70 2
71 4
72 4
73 2
74 16
75 50
76 3
77 9
78 2
79 22
80 25

List of values

[0, 2, 2, 2, 2, 4, 2, 2, 6, 2, 2, 24, 7, 2, 2, 3, 2, 2, 2, 4, 4, 2, 11, 2, 2, 8, 4, 2, 12, 4, 2, 2, 8, 3, 2, 2, 4, 2, 2, 38, 130, 4, 4, 4, 2, 3, 2, 4, 747, 3, 4, 2, 10, 2, 3, 17, 10, 13, 2, 2, 2, 6, 42, 2, 3, 2, 6, 2, 10, 2, 4, 4, 2, 16, 50, 3, 9, 2, 22, 25]

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

Content is available under The OEIS End-User License Agreement.