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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.

A378905 a(n) is the number of odd squarefree semiprimes (A046388) < prime(n).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 1
9 2
10 2
11 2
12 4
13 5
14 5
15 5
16 6
17 8
18 8
19 9
20 10
21 10
22 11
23 11
24 13
25 16
26 16
27 16
28 16
29 16
30 17
31 20
32 21
33 22
34 22
35 25
36 25
37 26
38 28
39 28
40 28
41 29
42 29
43 32
44 32
45 32
46 32
47 36
48 41
49 41
50 41
51 41
52 43
53 43
54 45
55 46
56 47
57 49
58 49
59 49
60 49
61 49
62 51
63 56
64 57
65 57
66 57
67 62
68 63
69 65
70 65
71 65
72 66

List of values

[0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 4, 5, 5, 5, 6, 8, 8, 9, 10, 10, 11, 11, 13, 16, 16, 16, 16, 16, 17, 20, 21, 22, 22, 25, 25, 26, 28, 28, 28, 29, 29, 32, 32, 32, 32, 36, 41, 41, 41, 41, 43, 43, 45, 46, 47, 49, 49, 49, 49, 49, 51, 56, 57, 57, 57, 62, 63, 65, 65, 65, 66]

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

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