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.

A173087 Semiprimes k such that k^2 - 7 and k^2 + 7 are also semiprime.

Table of values

n a(n)
1 82
2 142
3 214
4 254
5 326
6 358
7 386
8 478
9 538
10 542
11 566
12 674
13 758
14 802
15 974
16 1198
17 1366
18 1466
19 1594
20 1754
21 1762
22 1942
23 2302
24 2342
25 2374
26 2582
27 2654
28 2746
29 2762
30 2818
31 2998
32 3106
33 3134
34 3418
35 3494
36 3518
37 3554
38 3566
39 3646
40 3734
41 3778
42 3862
43 4138
44 4178
45 4258

List of values

[82, 142, 214, 254, 326, 358, 386, 478, 538, 542, 566, 674, 758, 802, 974, 1198, 1366, 1466, 1594, 1754, 1762, 1942, 2302, 2342, 2374, 2582, 2654, 2746, 2762, 2818, 2998, 3106, 3134, 3418, 3494, 3518, 3554, 3566, 3646, 3734, 3778, 3862, 4138, 4178, 4258]

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

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