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.

A070552 Semiprimes k such that k+1 is also a semiprime.

Table of values

n a(n)
1 9
2 14
3 21
4 25
5 33
6 34
7 38
8 57
9 85
10 86
11 93
12 94
13 118
14 121
15 122
16 133
17 141
18 142
19 145
20 158
21 177
22 201
23 202
24 205
25 213
26 214
27 217
28 218
29 253
30 298
31 301
32 302
33 326
34 334
35 361
36 381
37 393
38 394
39 445
40 446
41 453
42 481
43 501
44 514
45 526
46 537
47 542
48 553
49 565
50 622
51 633
52 634
53 694
54 697

List of values

[9, 14, 21, 25, 33, 34, 38, 57, 85, 86, 93, 94, 118, 121, 122, 133, 141, 142, 145, 158, 177, 201, 202, 205, 213, 214, 217, 218, 253, 298, 301, 302, 326, 334, 361, 381, 393, 394, 445, 446, 453, 481, 501, 514, 526, 537, 542, 553, 565, 622, 633, 634, 694, 697]