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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.

A061373 "Natural" logarithm, defined inductively by a(1)=1, a(p) = 1 + a(p-1) if p is prime and a(n*m) = a(n) + a(m) if n, m>1.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 5
7 6
8 6
9 6
10 7
11 8
12 7
13 8
14 8
15 8
16 8
17 9
18 8
19 9
20 9
21 9
22 10
23 11
24 9
25 10
26 10
27 9
28 10
29 11
30 10
31 11
32 10
33 11
34 11
35 11
36 10
37 11
38 11
39 11
40 11
41 12
42 11
43 12
44 12
45 11
46 13
47 14
48 11
49 12
50 12
51 12
52 12
53 13
54 11
55 13
56 12
57 12
58 13
59 14
60 12
61 13
62 13
63 12
64 12
65 13
66 13
67 14
68 13
69 14
70 13
71 14
72 12
73 13
74 13
75 13
76 13
77 14

List of values

[1, 2, 3, 4, 5, 5, 6, 6, 6, 7, 8, 7, 8, 8, 8, 8, 9, 8, 9, 9, 9, 10, 11, 9, 10, 10, 9, 10, 11, 10, 11, 10, 11, 11, 11, 10, 11, 11, 11, 11, 12, 11, 12, 12, 11, 13, 14, 11, 12, 12, 12, 12, 13, 11, 13, 12, 12, 13, 14, 12, 13, 13, 12, 12, 13, 13, 14, 13, 14, 13, 14, 12, 13, 13, 13, 13, 14]

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