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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.

A109406 Numbers m such that (sp(m)+sp(m+1)+sp(m+2))/3 is an integer, where sp(n) = n-th semiprime.

Table of values

n a(n)
1 3
2 4
3 9
4 10
5 11
6 14
7 20
8 28
9 29
10 32
11 34
12 40
13 43
14 44
15 45
16 46
17 50
18 53
19 58
20 59
21 61
22 62
23 63
24 68
25 69
26 72
27 74
28 80
29 83
30 86
31 89
32 95
33 99
34 100
35 101
36 105
37 107
38 109
39 111
40 112
41 115
42 116
43 118
44 119
45 121
46 123
47 127
48 129
49 130
50 131
51 132
52 136
53 137
54 140
55 144
56 145
57 150
58 151
59 152
60 153
61 155

List of values

[3, 4, 9, 10, 11, 14, 20, 28, 29, 32, 34, 40, 43, 44, 45, 46, 50, 53, 58, 59, 61, 62, 63, 68, 69, 72, 74, 80, 83, 86, 89, 95, 99, 100, 101, 105, 107, 109, 111, 112, 115, 116, 118, 119, 121, 123, 127, 129, 130, 131, 132, 136, 137, 140, 144, 145, 150, 151, 152, 153, 155]

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

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