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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.

A211396 Smallest prime substring of n, or 0 if no such substring exists.

Table of values

n a(n)
0 0
1 0
2 2
3 3
4 0
5 5
6 0
7 7
8 0
9 0
10 0
11 11
12 2
13 3
14 0
15 5
16 0
17 7
18 0
19 19
20 2
21 2
22 2
23 2
24 2
25 2
26 2
27 2
28 2
29 2
30 3
31 3
32 2
33 3
34 3
35 3
36 3
37 3
38 3
39 3
40 0
41 41
42 2
43 3
44 0
45 5
46 0
47 7
48 0
49 0
50 5
51 5
52 2
53 3
54 5
55 5
56 5
57 5
58 5
59 5
60 0
61 61
62 2
63 3
64 0
65 5
66 0
67 7
68 0
69 0
70 7
71 7
72 2
73 3
74 7
75 5
76 7
77 7
78 7
79 7
80 0
81 0
82 2
83 3
84 0
85 5

List of values

[0, 0, 2, 3, 0, 5, 0, 7, 0, 0, 0, 11, 2, 3, 0, 5, 0, 7, 0, 19, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 3, 3, 3, 3, 3, 3, 3, 0, 41, 2, 3, 0, 5, 0, 7, 0, 0, 5, 5, 2, 3, 5, 5, 5, 5, 5, 5, 0, 61, 2, 3, 0, 5, 0, 7, 0, 0, 7, 7, 2, 3, 7, 5, 7, 7, 7, 7, 0, 0, 2, 3, 0, 5]

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