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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.

A304483 a(n) = pi(n)*pi(2n), where pi is A000720: the prime counting function.

Table of values

n a(n)
1 0
2 2
3 6
4 8
5 12
6 15
7 24
8 24
9 28
10 32
11 40
12 45
13 54
14 54
15 60
16 66
17 77
18 77
19 96
20 96
21 104
22 112
23 126
24 135
25 135
26 135
27 144
28 144
29 160
30 170
31 198
32 198
33 198
34 209
35 209
36 220
37 252
38 252
39 252
40 264
41 286
42 299
43 322
44 322
45 336
46 336
47 360
48 360
49 375
50 375
51 390
52 405
53 432
54 448
55 464
56 464
57 480
58 480
59 510

List of values

[0, 2, 6, 8, 12, 15, 24, 24, 28, 32, 40, 45, 54, 54, 60, 66, 77, 77, 96, 96, 104, 112, 126, 135, 135, 135, 144, 144, 160, 170, 198, 198, 198, 209, 209, 220, 252, 252, 252, 264, 286, 299, 322, 322, 336, 336, 360, 360, 375, 375, 390, 405, 432, 448, 464, 464, 480, 480, 510]

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

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