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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.

A210625 Least semiprime dividing digit reversal of n, or 0 if no such factor.

Table of values

n a(n)
1 0
2 0
3 0
4 4
5 0
6 6
7 0
8 4
9 9
10 0
11 0
12 21
13 0
14 0
15 51
16 0
17 0
18 9
19 91
20 0
21 4
22 22
23 4
24 6
25 4
26 62
27 4
28 82
29 4
30 0
31 0
32 0
33 33
34 0
35 0
36 9
37 0
38 0
39 93
40 4
41 14
42 4
43 34
44 4
45 6
46 4
47 74
48 4
49 94
50 0
51 15
52 25
53 35
54 9
55 55
56 65
57 15
58 85
59 95
60 6
61 4
62 26
63 4
64 46
65 4
66 6
67 4
68 86
69 4
70 0
71 0
72 9
73 0
74 0
75 57
76 0
77 77
78 87

List of values

[0, 0, 0, 4, 0, 6, 0, 4, 9, 0, 0, 21, 0, 0, 51, 0, 0, 9, 91, 0, 4, 22, 4, 6, 4, 62, 4, 82, 4, 0, 0, 0, 33, 0, 0, 9, 0, 0, 93, 4, 14, 4, 34, 4, 6, 4, 74, 4, 94, 0, 15, 25, 35, 9, 55, 65, 15, 85, 95, 6, 4, 26, 4, 46, 4, 6, 4, 86, 4, 0, 0, 9, 0, 0, 57, 0, 77, 87]

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