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.

A205727 Number of odd semiprimes <= n^2.

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 4
6 6
7 8
8 11
9 14
10 19
11 23
12 28
13 33
14 37
15 46
16 51
17 56
18 66
19 73
20 80
21 88
22 96
23 108
24 118
25 126
26 134
27 148
28 159
29 172
30 183
31 197
32 207
33 220
34 234
35 249
36 263
37 280
38 297
39 309
40 323
41 338
42 356
43 376
44 393
45 412
46 427
47 449
48 465
49 482
50 505
51 527
52 544
53 561
54 582
55 606
56 634
57 658

List of values

[0, 0, 1, 2, 4, 6, 8, 11, 14, 19, 23, 28, 33, 37, 46, 51, 56, 66, 73, 80, 88, 96, 108, 118, 126, 134, 148, 159, 172, 183, 197, 207, 220, 234, 249, 263, 280, 297, 309, 323, 338, 356, 376, 393, 412, 427, 449, 465, 482, 505, 527, 544, 561, 582, 606, 634, 658]