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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.

A327539 Starting from n: as long as the decimal representation starts with a positive even number, divide the largest such prefix by 2; a(n) corresponds to the final value.

Table of values

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

List of values

[0, 1, 1, 3, 1, 5, 3, 7, 1, 9, 5, 11, 3, 13, 7, 15, 1, 17, 9, 19, 5, 11, 11, 13, 3, 15, 13, 17, 7, 19, 15, 31, 1, 33, 17, 35, 9, 37, 19, 39, 5, 11, 11, 13, 11, 15, 13, 17, 3, 19, 15, 51, 13, 53, 17, 55, 7, 57, 19, 59, 15, 31, 31, 33, 1, 35, 33, 37, 17, 39, 35, 71]

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