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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.

A227864 Smallest base in which n's digital reversal is prime, or 0 if no such base exists.

Table of values

n a(n)
0 0
1 0
2 3
3 2
4 0
5 2
6 2
7 2
8 4
9 6
10 2
11 2
12 2
13 2
14 2
15 3
16 8
17 2
18 3
19 3
20 2
21 3
22 2
23 2
24 2
25 2
26 2
27 9
28 2
29 2
30 6
31 2
32 4
33 3
34 2
35 3
36 12
37 2
38 6
39 3
40 2
41 2
42 6
43 2
44 2
45 3
46 2
47 2
48 2
49 3
50 2
51 9
52 2
53 2
54 3
55 2
56 2
57 3
58 2
59 4
60 12
61 2
62 2
63 3
64 12
65 3
66 6
67 2
68 2
69 3
70 10
71 2
72 6
73 2
74 2
75 3
76 10
77 2
78 26
79 3
80 2
81 27
82 2
83 2

List of values

[0, 0, 3, 2, 0, 2, 2, 2, 4, 6, 2, 2, 2, 2, 2, 3, 8, 2, 3, 3, 2, 3, 2, 2, 2, 2, 2, 9, 2, 2, 6, 2, 4, 3, 2, 3, 12, 2, 6, 3, 2, 2, 6, 2, 2, 3, 2, 2, 2, 3, 2, 9, 2, 2, 3, 2, 2, 3, 2, 4, 12, 2, 2, 3, 12, 3, 6, 2, 2, 3, 10, 2, 6, 2, 2, 3, 10, 2, 26, 3, 2, 27, 2, 2]

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