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.

A338909 Numbers of the form prime(x) * prime(y) where x and y have a common divisor > 1.

Table of values

n a(n)
1 9
2 21
3 25
4 39
5 49
6 57
7 65
8 87
9 91
10 111
11 115
12 121
13 129
14 133
15 159
16 169
17 183
18 185
19 203
20 213
21 235
22 237
23 247
24 259
25 267
26 289
27 299
28 301
29 303
30 305
31 319
32 321
33 339
34 361
35 365
36 371
37 377
38 393
39 417
40 427
41 445
42 453
43 481
44 489
45 497
46 515
47 517
48 519
49 529
50 543
51 551
52 553
53 559
54 565

List of values

[9, 21, 25, 39, 49, 57, 65, 87, 91, 111, 115, 121, 129, 133, 159, 169, 183, 185, 203, 213, 235, 237, 247, 259, 267, 289, 299, 301, 303, 305, 319, 321, 339, 361, 365, 371, 377, 393, 417, 427, 445, 453, 481, 489, 497, 515, 517, 519, 529, 543, 551, 553, 559, 565]