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.

A337431 Numbers k such that the largest prime factor of 2^k - 1 is greater than the largest prime factor of 2^k + 1.

Table of values

n a(n)
1 3
2 5
3 7
4 9
5 13
6 14
7 17
8 19
9 26
10 27
11 31
12 33
13 34
14 35
15 37
16 46
17 49
18 51
19 59
20 61
21 62
22 65
23 69
24 74
25 77
26 78
27 82
28 83
29 86
30 89
31 93
32 97
33 103
34 107
35 115
36 118
37 121
38 122
39 123
40 127
41 129
42 130
43 131
44 133
45 137
46 141
47 142
48 143
49 144
50 145
51 147
52 150
53 153
54 154
55 165
56 166
57 169
58 170
59 174
60 175

List of values

[3, 5, 7, 9, 13, 14, 17, 19, 26, 27, 31, 33, 34, 35, 37, 46, 49, 51, 59, 61, 62, 65, 69, 74, 77, 78, 82, 83, 86, 89, 93, 97, 103, 107, 115, 118, 121, 122, 123, 127, 129, 130, 131, 133, 137, 141, 142, 143, 144, 145, 147, 150, 153, 154, 165, 166, 169, 170, 174, 175]

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

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