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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.

A285786 Number of primes p with 2(n-1)^2 < p <= 2n^2.

Table of values

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

List of values

[1, 3, 3, 4, 4, 5, 5, 6, 6, 9, 7, 8, 7, 9, 10, 10, 9, 12, 10, 11, 13, 11, 14, 13, 14, 13, 14, 16, 16, 15, 15, 16, 17, 18, 19, 14, 22, 19, 18, 16, 22, 18, 24, 20, 22, 22, 20, 23, 24, 22, 23, 21, 25, 27, 24, 27, 26, 25, 27, 25, 23, 33, 28, 25, 29, 28, 31, 30, 33, 29]

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

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