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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.

A383641 a(n) is the difference between the sum of even composites and the sum of the odd composites in the first n positive integers.

Table of values

n a(n)
1 0
2 0
3 0
4 4
5 4
6 10
7 10
8 18
9 9
10 19
11 19
12 31
13 31
14 45
15 30
16 46
17 46
18 64
19 64
20 84
21 63
22 85
23 85
24 109
25 84
26 110
27 83
28 111
29 111
30 141
31 141
32 173
33 140
34 174
35 139
36 175
37 175
38 213
39 174
40 214
41 214
42 256
43 256
44 300
45 255
46 301
47 301
48 349
49 300
50 350
51 299
52 351
53 351
54 405
55 350
56 406
57 349
58 407
59 407

List of values

[0, 0, 0, 4, 4, 10, 10, 18, 9, 19, 19, 31, 31, 45, 30, 46, 46, 64, 64, 84, 63, 85, 85, 109, 84, 110, 83, 111, 111, 141, 141, 173, 140, 174, 139, 175, 175, 213, 174, 214, 214, 256, 256, 300, 255, 301, 301, 349, 300, 350, 299, 351, 351, 405, 350, 406, 349, 407, 407]

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

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