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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.

A187400 Semiprimes with a semiprime average of the two factors.

Table of values

n a(n)
1 15
2 35
3 51
4 65
5 77
6 91
7 115
8 123
9 141
10 161
11 185
12 187
13 201
14 209
15 219
16 221
17 235
18 259
19 267
20 301
21 305
22 321
23 339
24 341
25 355
26 365
27 377
28 381
29 403
30 413
31 427
32 437
33 451
34 453
35 481
36 485
37 497
38 501
39 537
40 545
41 589
42 649
43 667
44 681
45 689
46 699
47 717
48 721
49 723
50 737
51 745
52 749
53 763
54 789
55 835
56 843
57 849
58 893
59 901
60 905

List of values

[15, 35, 51, 65, 77, 91, 115, 123, 141, 161, 185, 187, 201, 209, 219, 221, 235, 259, 267, 301, 305, 321, 339, 341, 355, 365, 377, 381, 403, 413, 427, 437, 451, 453, 481, 485, 497, 501, 537, 545, 589, 649, 667, 681, 689, 699, 717, 721, 723, 737, 745, 749, 763, 789, 835, 843, 849, 893, 901, 905]

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

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