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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.

A276565 Oblong numbers n such that n - 1 and n + 1 are both semiprime.

Table of values

n a(n)
1 56
2 552
3 870
4 1056
5 1190
6 1640
7 1892
8 2652
9 4032
10 5256
11 5402
12 6806
13 8372
14 9120
15 9506
16 9702
17 10920
18 11772
19 12656
20 12882
21 15006
22 15252
23 15500
24 16256
25 16770
26 17556
27 18632
28 23256
29 24492
30 27722
31 29070
32 30800
33 33306
34 33672
35 34410
36 36290
37 40200
38 40602
39 44310
40 45582
41 46872
42 49506

List of values

[56, 552, 870, 1056, 1190, 1640, 1892, 2652, 4032, 5256, 5402, 6806, 8372, 9120, 9506, 9702, 10920, 11772, 12656, 12882, 15006, 15252, 15500, 16256, 16770, 17556, 18632, 23256, 24492, 27722, 29070, 30800, 33306, 33672, 34410, 36290, 40200, 40602, 44310, 45582, 46872, 49506]

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

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