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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.

A176654 Numbers k such that both semiprime(k)/p and semiprime(semiprime(k))/p are prime for some prime p.

Table of values

n a(n)
1 1
2 2
3 4
4 5
5 6
6 8
7 14
8 20
9 21
10 22
11 24
12 27
13 28
14 42
15 43
16 47
17 52
18 58
19 62
20 64
21 65
22 66
23 70
24 73
25 75
26 82
27 87
28 92
29 97
30 105
31 109
32 111
33 116
34 129
35 130
36 133
37 135
38 147
39 149
40 150
41 161
42 170
43 171
44 172
45 189
46 191
47 195
48 208
49 220
50 222
51 224
52 227
53 241
54 246
55 267
56 274
57 276
58 277
59 281
60 287

List of values

[1, 2, 4, 5, 6, 8, 14, 20, 21, 22, 24, 27, 28, 42, 43, 47, 52, 58, 62, 64, 65, 66, 70, 73, 75, 82, 87, 92, 97, 105, 109, 111, 116, 129, 130, 133, 135, 147, 149, 150, 161, 170, 171, 172, 189, 191, 195, 208, 220, 222, 224, 227, 241, 246, 267, 274, 276, 277, 281, 287]

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

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