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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.

A306920 a(n) is the smallest prime > 10 where a string of exactly n zeros can be inserted somewhere into the decimal expansion such that the resulting number is also prime.

Table of values

n a(n)
1 11
2 19
3 17
4 13
5 13
6 23
7 17
8 17
9 31
10 13
11 23
12 41
13 137
14 61
15 23
16 13
17 13
18 67
19 53
20 89
21 19
22 107
23 17
24 29
25 61
26 263
27 31
28 37
29 127
30 53
31 269
32 199
33 137
34 23
35 31
36 89
37 61
38 13
39 43
40 163
41 53
42 131
43 109
44 19
45 79
46 283
47 109
48 19
49 269
50 223
51 97
52 97
53 223
54 89
55 13
56 79
57 67
58 107
59 17
60 389
61 197

List of values

[11, 19, 17, 13, 13, 23, 17, 17, 31, 13, 23, 41, 137, 61, 23, 13, 13, 67, 53, 89, 19, 107, 17, 29, 61, 263, 31, 37, 127, 53, 269, 199, 137, 23, 31, 89, 61, 13, 43, 163, 53, 131, 109, 19, 79, 283, 109, 19, 269, 223, 97, 97, 223, 89, 13, 79, 67, 107, 17, 389, 197]

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

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