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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.

A089646 a(n) = Sum(a(floor(n/p)): p prime and p<=n); a(1) = 1.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 3
6 4
7 5
8 5
9 6
10 7
11 8
12 9
13 10
14 11
15 13
16 13
17 14
18 16
19 17
20 18
21 20
22 21
23 22
24 23
25 24
26 25
27 26
28 27
29 28
30 32
31 33
32 33
33 35
34 36
35 38
36 41
37 42
38 43
39 45
40 46
41 47
42 51
43 52
44 53
45 56
46 57
47 58
48 59
49 60
50 62
51 64
52 65
53 66
54 69
55 71
56 72
57 74
58 75
59 76
60 82
61 83
62 84
63 87
64 87
65 89
66 93
67 94
68 95
69 97
70 101
71 102
72 106

List of values

[1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 13, 13, 14, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 32, 33, 33, 35, 36, 38, 41, 42, 43, 45, 46, 47, 51, 52, 53, 56, 57, 58, 59, 60, 62, 64, 65, 66, 69, 71, 72, 74, 75, 76, 82, 83, 84, 87, 87, 89, 93, 94, 95, 97, 101, 102, 106]

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

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