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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.

A087718 Semiprimes with greater factor less than twice the smaller factor.

Table of values

n a(n)
1 4
2 6
3 9
4 15
5 25
6 35
7 49
8 77
9 91
10 121
11 143
12 169
13 187
14 209
15 221
16 247
17 289
18 299
19 323
20 361
21 391
22 437
23 493
24 527
25 529
26 551
27 589
28 667
29 703
30 713
31 841
32 851
33 899
34 943
35 961
36 989
37 1073
38 1147
39 1189
40 1247
41 1271
42 1333
43 1363
44 1369
45 1457
46 1517
47 1537
48 1591
49 1643
50 1681

List of values

[4, 6, 9, 15, 25, 35, 49, 77, 91, 121, 143, 169, 187, 209, 221, 247, 289, 299, 323, 361, 391, 437, 493, 527, 529, 551, 589, 667, 703, 713, 841, 851, 899, 943, 961, 989, 1073, 1147, 1189, 1247, 1271, 1333, 1363, 1369, 1457, 1517, 1537, 1591, 1643, 1681]

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

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