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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.

A108873 Numbers n whose base 3 representations, interpreted as base 10 integers, are semiprimes.

Table of values

n a(n)
1 3
2 7
3 8
4 13
5 16
6 17
7 19
8 20
9 25
10 31
11 37
12 40
13 43
14 47
15 49
16 61
17 64
18 65
19 71
20 73
21 82
22 88
23 89
24 92
25 97
26 100
27 101
28 106
29 110
30 115
31 118
32 121
33 127
34 136
35 142
36 143
37 155
38 179
39 184
40 187
41 188
42 191
43 209
44 232
45 235
46 244
47 250
48 254
49 259
50 262
51 263
52 265
53 269
54 274
55 281
56 289
57 299
58 314
59 319

List of values

[3, 7, 8, 13, 16, 17, 19, 20, 25, 31, 37, 40, 43, 47, 49, 61, 64, 65, 71, 73, 82, 88, 89, 92, 97, 100, 101, 106, 110, 115, 118, 121, 127, 136, 142, 143, 155, 179, 184, 187, 188, 191, 209, 232, 235, 244, 250, 254, 259, 262, 263, 265, 269, 274, 281, 289, 299, 314, 319]

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

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