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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.

A130520 a(n) = Sum_{k=0..n} floor(k/5). (Partial sums of A002266.)

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 1
6 2
7 3
8 4
9 5
10 7
11 9
12 11
13 13
14 15
15 18
16 21
17 24
18 27
19 30
20 34
21 38
22 42
23 46
24 50
25 55
26 60
27 65
28 70
29 75
30 81
31 87
32 93
33 99
34 105
35 112
36 119
37 126
38 133
39 140
40 148
41 156
42 164
43 172
44 180
45 189
46 198
47 207
48 216
49 225
50 235
51 245
52 255
53 265
54 275
55 286
56 297
57 308
58 319
59 330
60 342
61 354
62 366

List of values

[0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 7, 9, 11, 13, 15, 18, 21, 24, 27, 30, 34, 38, 42, 46, 50, 55, 60, 65, 70, 75, 81, 87, 93, 99, 105, 112, 119, 126, 133, 140, 148, 156, 164, 172, 180, 189, 198, 207, 216, 225, 235, 245, 255, 265, 275, 286, 297, 308, 319, 330, 342, 354, 366]

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

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