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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.

A022830 a(n) = -[ n/2 ] + a([ n/2 ]) + a([ n/3 ]) + . . . + a([ n/n ]).

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 1
6 2
7 0
8 2
9 2
10 3
11 2
12 3
13 3
14 6
15 2
16 3
17 5
18 6
19 5
20 8
21 8
22 9
23 5
24 7
25 7
26 11
27 10
28 11
29 15
30 16
31 8
32 11
33 11
34 14
35 16
36 17
37 17
38 20
39 16
40 17
41 21
42 22
43 21
44 29
45 29
46 30
47 18
48 20
49 22
50 25
51 24
52 25
53 33
54 36
55 32
56 35
57 35
58 36
59 41
60 42
61 42
62 50
63 34
64 37
65 41
66 42
67 41
68 44
69 48
70 49
71 47
72 48
73 48
74 56

List of values

[1, 0, 1, 0, 1, 1, 2, 0, 2, 2, 3, 2, 3, 3, 6, 2, 3, 5, 6, 5, 8, 8, 9, 5, 7, 7, 11, 10, 11, 15, 16, 8, 11, 11, 14, 16, 17, 17, 20, 16, 17, 21, 22, 21, 29, 29, 30, 18, 20, 22, 25, 24, 25, 33, 36, 32, 35, 35, 36, 41, 42, 42, 50, 34, 37, 41, 42, 41, 44, 48, 49, 47, 48, 48, 56]

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

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