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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.

A175634 Chen semiprimes: semiprimes m such that m+4 is either a prime or a semiprime.

Table of values

n a(n)
1 6
2 9
3 10
4 15
5 21
6 22
7 25
8 33
9 34
10 35
11 39
12 49
13 51
14 55
15 57
16 58
17 65
18 69
19 82
20 85
21 87
22 91
23 93
24 111
25 115
26 118
27 119
28 123
29 129
30 133
31 141
32 142
33 145
34 155
35 159
36 169
37 177
38 183
39 187
40 201
41 202
42 205
43 209
44 213
45 214
46 215
47 217
48 219
49 235
50 237
51 247
52 249
53 253
54 259
55 265
56 267
57 274
58 287

List of values

[6, 9, 10, 15, 21, 22, 25, 33, 34, 35, 39, 49, 51, 55, 57, 58, 65, 69, 82, 85, 87, 91, 93, 111, 115, 118, 119, 123, 129, 133, 141, 142, 145, 155, 159, 169, 177, 183, 187, 201, 202, 205, 209, 213, 214, 215, 217, 219, 235, 237, 247, 249, 253, 259, 265, 267, 274, 287]