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.

A121609 Composite numbers that can be written as concatenation of two primes in decimal representation.

Table of values

n a(n)
1 22
2 25
3 27
4 32
5 33
6 35
7 52
8 55
9 57
10 72
11 75
12 77
13 112
14 115
15 117
16 132
17 133
18 135
19 172
20 175
21 177
22 192
23 195
24 213
25 217
26 219
27 231
28 232
29 235
30 237
31 243
32 247
33 253
34 259
35 261
36 267
37 273
38 279
39 289
40 292
41 295
42 297
43 312
44 315
45 319
46 323
47 329
48 341
49 343
50 361
51 371
52 372
53 375
54 377

List of values

[22, 25, 27, 32, 33, 35, 52, 55, 57, 72, 75, 77, 112, 115, 117, 132, 133, 135, 172, 175, 177, 192, 195, 213, 217, 219, 231, 232, 235, 237, 243, 247, 253, 259, 261, 267, 273, 279, 289, 292, 295, 297, 312, 315, 319, 323, 329, 341, 343, 361, 371, 372, 375, 377]