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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.

A175520 Number of distinct transpositions of digits (zeros and units) in n-th semiprime written in base 2.

Table of values

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

List of values

[3, 3, 6, 6, 4, 1, 10, 10, 10, 10, 15, 15, 20, 20, 15, 15, 20, 15, 6, 15, 15, 6, 21, 35, 35, 35, 35, 35, 35, 21, 21, 21, 21, 7, 35, 7, 21, 21, 7, 21, 21, 7, 28, 56, 56, 70, 70, 56, 56, 56, 56, 56, 28, 56, 70, 70, 70, 70, 28, 56, 28, 56, 70, 70, 56, 56, 56, 70, 56, 56, 28, 56, 56, 28]

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