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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.

A068497 Primes p such that 2*p+1 and 2*p-1 are composites.

Table of values

n a(n)
1 13
2 17
3 43
4 47
5 59
6 61
7 67
8 71
9 73
10 101
11 103
12 107
13 109
14 127
15 137
16 149
17 151
18 163
19 167
20 181
21 193
22 197
23 223
24 227
25 241
26 257
27 263
28 269
29 277
30 283
31 311
32 313
33 317
34 347
35 349
36 353
37 373
38 383
39 389
40 397
41 401
42 409
43 421
44 433
45 449
46 457
47 461
48 463
49 467
50 479
51 487
52 503
53 521

List of values

[13, 17, 43, 47, 59, 61, 67, 71, 73, 101, 103, 107, 109, 127, 137, 149, 151, 163, 167, 181, 193, 197, 223, 227, 241, 257, 263, 269, 277, 283, 311, 313, 317, 347, 349, 353, 373, 383, 389, 397, 401, 409, 421, 433, 449, 457, 461, 463, 467, 479, 487, 503, 521]

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

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