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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.

A177221 Numbers k that are the products of two distinct primes such that 2*k + 1 is also the product of two distinct primes.

Table of values

n a(n)
1 10
2 34
3 38
4 46
5 55
6 57
7 77
8 91
9 93
10 106
11 118
12 123
13 129
14 133
15 143
16 145
17 159
18 161
19 177
20 185
21 201
22 203
23 205
24 206
25 213
26 218
27 226
28 235
29 259
30 267
31 291
32 295
33 298
34 305
35 314
36 327
37 334
38 335
39 339
40 358
41 365
42 377
43 381
44 394
45 395
46 403
47 407
48 415
49 417
50 446
51 447
52 458
53 466
54 469

List of values

[10, 34, 38, 46, 55, 57, 77, 91, 93, 106, 118, 123, 129, 133, 143, 145, 159, 161, 177, 185, 201, 203, 205, 206, 213, 218, 226, 235, 259, 267, 291, 295, 298, 305, 314, 327, 334, 335, 339, 358, 365, 377, 381, 394, 395, 403, 407, 415, 417, 446, 447, 458, 466, 469]

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

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