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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.

A344637 a(n) is the smallest k > 0 such that the number that results from inserting a string of k zeros between all adjacent digits of prime(n) is also prime, or 0 if no such k exists.

Table of values

n a(n)
5 1
6 1
7 1
8 1
9 2
10 4
11 2
12 1
13 1
14 2
15 2
16 1
17 1
18 1
19 1
20 1
21 3
22 1
23 30
24 1
25 1

List of values

[1, 1, 1, 1, 2, 4, 2, 1, 1, 2, 2, 1, 1, 1, 1, 1, 3, 1, 30, 1, 1]