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.

A276803 Semiprimes k such that the concatenation of its prime factors is prime.

Table of values

n a(n)
1 6
2 21
3 22
4 33
5 39
6 46
7 51
8 58
9 82
10 93
11 111
12 115
13 133
14 141
15 142
16 159
17 166
18 177
19 187
20 201
21 205
22 219
23 226
24 235
25 237
26 247
27 249
28 253
29 262
30 267
31 274
32 291
33 301
34 319
35 327
36 355
37 358
38 391
39 411
40 427
41 478
42 489
43 501
44 502
45 505
46 511
47 535
48 538
49 543
50 562
51 565
52 573
53 583
54 586
55 589

List of values

[6, 21, 22, 33, 39, 46, 51, 58, 82, 93, 111, 115, 133, 141, 142, 159, 166, 177, 187, 201, 205, 219, 226, 235, 237, 247, 249, 253, 262, 267, 274, 291, 301, 319, 327, 355, 358, 391, 411, 427, 478, 489, 501, 502, 505, 511, 535, 538, 543, 562, 565, 573, 583, 586, 589]