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.

A337430 Numbers k such that the largest prime factor of 2^k - 1 is less than the largest prime factor of 2^k + 1.

Table of values

n a(n)
1 2
2 4
3 6
4 8
5 10
6 11
7 12
8 15
9 16
10 18
11 20
12 21
13 22
14 23
15 24
16 25
17 28
18 29
19 30
20 32
21 36
22 38
23 39
24 40
25 41
26 42
27 43
28 44
29 45
30 47
31 48
32 50
33 52
34 53
35 54
36 55
37 56
38 57
39 58
40 60
41 63
42 64
43 66
44 67
45 68
46 70
47 71
48 72
49 73
50 75
51 76
52 79
53 80
54 81
55 84
56 85
57 87
58 88
59 90
60 91
61 92
62 94
63 95
64 96
65 98
66 99
67 100

List of values

[2, 4, 6, 8, 10, 11, 12, 15, 16, 18, 20, 21, 22, 23, 24, 25, 28, 29, 30, 32, 36, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 50, 52, 53, 54, 55, 56, 57, 58, 60, 63, 64, 66, 67, 68, 70, 71, 72, 73, 75, 76, 79, 80, 81, 84, 85, 87, 88, 90, 91, 92, 94, 95, 96, 98, 99, 100]

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

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