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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.

A173022 Number of numbers <= n whose binary representation is without isolated ones.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 2
6 3
7 4
8 4
9 4
10 4
11 4
12 5
13 5
14 6
15 7
16 7
17 7
18 7
19 7
20 7
21 7
22 7
23 7
24 8
25 8
26 8
27 9
28 10
29 10
30 11
31 12
32 12
33 12
34 12
35 12
36 12
37 12
38 12
39 12
40 12
41 12
42 12
43 12
44 12
45 12
46 12
47 12
48 13
49 13
50 13
51 14
52 14
53 14
54 15
55 16
56 17
57 17
58 17
59 18
60 19
61 19
62 20
63 21
64 21
65 21
66 21
67 21
68 21
69 21
70 21
71 21
72 21
73 21
74 21
75 21
76 21
77 21
78 21

List of values

[1, 1, 1, 2, 2, 2, 3, 4, 4, 4, 4, 4, 5, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 9, 10, 10, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 17, 17, 17, 18, 19, 19, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21]

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

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