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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.

A168048 a(n) = C(n)*Pi(n) where C(n) = number of nonprimes <= n, Pi(n) = number of primes <= n.

Table of values

n a(n)
1 0
2 1
3 2
4 4
5 6
6 9
7 12
8 16
9 20
10 24
11 30
12 35
13 42
14 48
15 54
16 60
17 70
18 77
19 88
20 96
21 104
22 112
23 126
24 135
25 144
26 153
27 162
28 171
29 190
30 200
31 220
32 231
33 242
34 253
35 264
36 275
37 300
38 312
39 324
40 336
41 364
42 377
43 406
44 420
45 434
46 448
47 480
48 495
49 510
50 525
51 540
52 555
53 592
54 608
55 624
56 640
57 656
58 672

List of values

[0, 1, 2, 4, 6, 9, 12, 16, 20, 24, 30, 35, 42, 48, 54, 60, 70, 77, 88, 96, 104, 112, 126, 135, 144, 153, 162, 171, 190, 200, 220, 231, 242, 253, 264, 275, 300, 312, 324, 336, 364, 377, 406, 420, 434, 448, 480, 495, 510, 525, 540, 555, 592, 608, 624, 640, 656, 672]

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

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