cp's OEIS Frontend

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.

A211375 Semiprimes that have both prime digits (2,3,5,7) and nonprime digits (1,4,6,8,9), without digits "0".

Table of values

n a(n)
1 15
2 21
3 26
4 34
5 38
6 39
7 51
8 58
9 62
10 65
11 74
12 82
13 85
14 87
15 93
16 95
17 115
18 121
19 122
20 123
21 129
22 133
23 134
24 142
25 143
26 145
27 155
28 158
29 159
30 177
31 178
32 183
33 185
34 187
35 213
36 214
37 215
38 217
39 218
40 219
41 221
42 226
43 247
44 249
45 254
46 259
47 262
48 265
49 267
50 274
51 278

List of values

[15, 21, 26, 34, 38, 39, 51, 58, 62, 65, 74, 82, 85, 87, 93, 95, 115, 121, 122, 123, 129, 133, 134, 142, 143, 145, 155, 158, 159, 177, 178, 183, 185, 187, 213, 214, 215, 217, 218, 219, 221, 226, 247, 249, 254, 259, 262, 265, 267, 274, 278]