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A381018 a(n) is the number of primes in A000328 for r <= n.

Table of values

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

List of values

[1, 2, 3, 3, 3, 4, 5, 6, 6, 7, 7, 7, 7, 8, 9, 10, 10, 11, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 22, 22, 22, 22, 22, 22, 23, 23, 23]

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

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