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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.

A047814 Largest 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 13
14 0
15 5
16 0
17 17
18 0
19 19
20 2
21 2
22 2
23 23
24 2
25 5
26 2
27 7
28 2
29 29
30 3
31 31
32 3
33 3
34 3
35 5
36 3
37 37
38 3
39 3
40 0
41 41
42 2
43 43
44 0
45 5
46 0
47 47
48 0
49 0
50 5
51 5
52 5
53 53
54 5
55 5
56 5
57 7
58 5
59 59
60 0
61 61
62 2
63 3
64 0
65 5
66 0
67 67
68 0
69 0
70 7
71 71
72 7
73 73
74 7
75 7
76 7
77 7
78 7
79 79
80 0
81 0
82 2
83 83
84 0
85 5
86 0
87 7
88 0
89 89

List of values

[0, 0, 2, 3, 0, 5, 0, 7, 0, 0, 0, 11, 2, 13, 0, 5, 0, 17, 0, 19, 2, 2, 2, 23, 2, 5, 2, 7, 2, 29, 3, 31, 3, 3, 3, 5, 3, 37, 3, 3, 0, 41, 2, 43, 0, 5, 0, 47, 0, 0, 5, 5, 5, 53, 5, 5, 5, 7, 5, 59, 0, 61, 2, 3, 0, 5, 0, 67, 0, 0, 7, 71, 7, 73, 7, 7, 7, 7, 7, 79, 0, 0, 2, 83, 0, 5, 0, 7, 0, 89]

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