cp's OEIS Frontend

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.

A081610 Number of numbers <= n having at least one 2 in their ternary representation.

Table of values

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

List of values

[0, 0, 1, 1, 1, 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19, 19, 20, 20, 20, 21, 22, 23, 24, 24, 24, 25, 25, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53]

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

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