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.

A037271 Number of steps to reach a prime under "replace n with concatenation of its prime factors" when applied to n-th composite number, or -1 if no such number exists.

Table of values

n a(n)
1 2
2 1
3 13
4 2
5 4
6 1
7 5
8 4
9 4
10 1
11 15
12 1
13 1
14 2
15 3
16 4
17 4
18 1
19 2
20 2
21 1
22 5
23 3
24 2
25 2
26 1
27 9
28 2
29 9
30 6
31 1
32 15

List of values

[2, 1, 13, 2, 4, 1, 5, 4, 4, 1, 15, 1, 1, 2, 3, 4, 4, 1, 2, 2, 1, 5, 3, 2, 2, 1, 9, 2, 9, 6, 1, 15]