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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.

A033920 Largest proper substring of n-th prime that is prime (0 if none).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 3
7 7
8 0
9 3
10 2
11 3
12 7
13 0
14 3
15 7
16 5
17 5
18 0
19 7
20 7
21 7
22 7
23 3
24 0
25 7
26 0
27 3
28 7
29 0
30 13
31 7
32 31
33 37
34 13
35 0
36 5
37 7
38 3
39 67
40 73
41 79
42 0
43 19
44 19
45 97
46 19
47 11
48 23
49 7
50 29
51 23
52 23
53 41
54 5
55 7
56 3
57 2
58 71
59 7
60 2
61 83
62 29
63 7
64 31
65 31
66 31
67 31
68 37
69 47
70 3
71 53
72 59
73 67
74 73
75 79
76 83
77 89
78 97
79 0
80 0
81 41
82 2
83 43
84 43
85 43

List of values

[0, 0, 0, 0, 0, 3, 7, 0, 3, 2, 3, 7, 0, 3, 7, 5, 5, 0, 7, 7, 7, 7, 3, 0, 7, 0, 3, 7, 0, 13, 7, 31, 37, 13, 0, 5, 7, 3, 67, 73, 79, 0, 19, 19, 97, 19, 11, 23, 7, 29, 23, 23, 41, 5, 7, 3, 2, 71, 7, 2, 83, 29, 7, 31, 31, 31, 31, 37, 47, 3, 53, 59, 67, 73, 79, 83, 89, 97, 0, 0, 41, 2, 43, 43, 43]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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