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.

A081609 Number of numbers <= n having at least one 1 in their ternary representation.

Table of values

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

List of values

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

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

Content is available under The OEIS End-User License Agreement.