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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.

A288726 a(n) = Sum_{i=floor((n-1)/2)..n-1} i * c(i), where c is the prime characteristic (A010051).

Table of values

n a(n)
0 0
1 0
2 0
3 2
4 5
5 5
6 10
7 8
8 15
9 12
10 12
11 12
12 23
13 18
14 31
15 31
16 31
17 24
18 41
19 41
20 60
21 60
22 60
23 60
24 83
25 72
26 72
27 72
28 72
29 59
30 88
31 88
32 119
33 119
34 119
35 119
36 119
37 102
38 139
39 139
40 139
41 120
42 161
43 161
44 204
45 204
46 204
47 204
48 251
49 228
50 228
51 228
52 228
53 228
54 281
55 281
56 281
57 281
58 281
59 281
60 340
61 311
62 372
63 372
64 372
65 341
66 341
67 341
68 408

List of values

[0, 0, 0, 2, 5, 5, 10, 8, 15, 12, 12, 12, 23, 18, 31, 31, 31, 24, 41, 41, 60, 60, 60, 60, 83, 72, 72, 72, 72, 59, 88, 88, 119, 119, 119, 119, 119, 102, 139, 139, 139, 120, 161, 161, 204, 204, 204, 204, 251, 228, 228, 228, 228, 228, 281, 281, 281, 281, 281, 281, 340, 311, 372, 372, 372, 341, 341, 341, 408]

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

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