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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.

A081607 Number of numbers <= n having at least one 0 in their ternary representation.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 2
6 3
7 3
8 3
9 4
10 5
11 6
12 7
13 7
14 7
15 8
16 8
17 8
18 9
19 10
20 11
21 12
22 12
23 12
24 13
25 13
26 13
27 14
28 15
29 16
30 17
31 18
32 19
33 20
34 21
35 22
36 23
37 24
38 25
39 26
40 26
41 26
42 27
43 27
44 27
45 28
46 29
47 30
48 31
49 31
50 31
51 32
52 32
53 32
54 33
55 34
56 35
57 36
58 37
59 38
60 39
61 40
62 41
63 42
64 43
65 44
66 45
67 45
68 45
69 46
70 46
71 46
72 47
73 48
74 49
75 50

List of values

[1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 5, 6, 7, 7, 7, 8, 8, 8, 9, 10, 11, 12, 12, 12, 13, 13, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 26, 26, 27, 27, 27, 28, 29, 30, 31, 31, 31, 32, 32, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 45, 45, 46, 46, 46, 47, 48, 49, 50]

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