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.

A110409 Number of times repeated reverse concatenation of n followed by n gives a prime, where n == 1,3,7 or 9 (mod 10), or 0 if no such prime exists.

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 0
5 10
6 3
7 7
8 0
9 3
10 0
11 10
12 3
13 0
14 22
15 0
16 51
17 7
18 9
19 10
20 0
21 412
22 0
23 16
24 18
25 0
26 3
27 0
28 3
29 3
30 0
31 9
32 0
33 3
34 0
35 3
36 4
37 0
38 3
39 0
40 0

List of values

[1, 0, 0, 0, 0, 10, 3, 7, 0, 3, 0, 10, 3, 0, 22, 0, 51, 7, 9, 10, 0, 412, 0, 16, 18, 0, 3, 0, 3, 3, 0, 9, 0, 3, 0, 3, 4, 0, 3, 0, 0]