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.

A068406 Numbers n such that n and 2n+1 have the same number of prime divisors.

Table of values

n a(n)
1 2
2 3
3 4
4 5
5 8
6 9
7 10
8 11
9 13
10 22
11 23
12 28
13 29
14 34
15 38
16 41
17 45
18 46
19 53
20 55
21 57
22 58
23 72
24 76
25 77
26 80
27 81
28 83
29 85
30 87
31 88
32 89
33 91
34 92
35 93
36 94
37 100
38 104
39 106
40 108
41 112
42 113
43 117
44 118
45 121
46 122
47 123
48 124
49 125
50 128
51 129
52 131
53 133
54 143
55 145
56 147
57 148
58 152
59 159
60 160
61 161
62 162

List of values

[2, 3, 4, 5, 8, 9, 10, 11, 13, 22, 23, 28, 29, 34, 38, 41, 45, 46, 53, 55, 57, 58, 72, 76, 77, 80, 81, 83, 85, 87, 88, 89, 91, 92, 93, 94, 100, 104, 106, 108, 112, 113, 117, 118, 121, 122, 123, 124, 125, 128, 129, 131, 133, 143, 145, 147, 148, 152, 159, 160, 161, 162]

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

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