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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.

A110602 Numbers n whose base 4 representations, interpreted as base 10 integers, are semiprimes.

Table of values

n a(n)
1 4
2 9
3 10
4 15
5 21
6 25
7 26
8 27
9 31
10 33
11 34
12 35
13 39
14 41
15 49
16 50
17 51
18 57
19 59
20 67
21 69
22 81
23 85
24 89
25 95
26 98
27 99
28 101
29 119
30 122
31 127
32 137
33 141
34 143
35 145
36 146
37 147
38 154
39 155
40 161
41 173
42 178
43 185
44 187
45 199
46 202
47 205
48 209
49 211
50 215
51 221
52 223
53 226
54 235
55 239
56 257
57 259
58 265
59 266

List of values

[4, 9, 10, 15, 21, 25, 26, 27, 31, 33, 34, 35, 39, 41, 49, 50, 51, 57, 59, 67, 69, 81, 85, 89, 95, 98, 99, 101, 119, 122, 127, 137, 141, 143, 145, 146, 147, 154, 155, 161, 173, 178, 185, 187, 199, 202, 205, 209, 211, 215, 221, 223, 226, 235, 239, 257, 259, 265, 266]

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

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