cp's OEIS Frontend

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.

A102723 Smallest prime a(n) such that a(n)-x and a(n)+x, for x=1 to n, are all composite.

Table of values

n a(n)
1 5
2 23
3 23
4 53
5 53
6 211
7 211
8 211
9 211
10 211
11 211
12 1847
13 1847
14 2179
15 2179
16 2179
17 2179
18 3967
19 3967
20 16033
21 16033
22 16033
23 16033
24 24281
25 24281
26 24281
27 24281
28 24281
29 24281
30 38501
31 38501
32 38501
33 38501
34 38501
35 38501
36 38501
37 38501
38 38501
39 38501
40 58831

List of values

[5, 23, 23, 53, 53, 211, 211, 211, 211, 211, 211, 1847, 1847, 2179, 2179, 2179, 2179, 3967, 3967, 16033, 16033, 16033, 16033, 24281, 24281, 24281, 24281, 24281, 24281, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 58831]

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

Content is available under The OEIS End-User License Agreement.