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.

A247071 Numbers n such that 2^n-1 has only one primitive prime factor, sorted according to the magnitude of the corresponding prime.

Table of values

n a(n)
1 2
2 4
3 3
4 10
5 12
6 8
7 18
8 5
9 20
10 14
11 9
12 7
13 15
14 24
15 16
16 30
17 21
18 22
19 26
20 42
21 13
22 34
23 40
24 32
25 54
26 17
27 38
28 27
29 19
30 33
31 46
32 56
33 90
34 78
35 62
36 31
37 80

List of values

[2, 4, 3, 10, 12, 8, 18, 5, 20, 14, 9, 7, 15, 24, 16, 30, 21, 22, 26, 42, 13, 34, 40, 32, 54, 17, 38, 27, 19, 33, 46, 56, 90, 78, 62, 31, 80]