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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.

A020915 Number of digits in base-3 representation of 2^n.

Table of values

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

List of values

[1, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 11, 11, 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 19, 20, 21, 21, 22, 23, 23, 24, 24, 25, 26, 26, 27, 28, 28, 29, 30, 30, 31, 31, 32, 33, 33, 34, 35, 35, 36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 42, 43, 43, 44, 45, 45, 46, 47]

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

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