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.

A213304 Smallest number with n nonprime substrings (Version 3: substrings with leading zeros are counted as nonprime if the corresponding number is not a prime).

Table of values

n a(n)
0 2
1 1
2 10
3 14
4 101
5 104
6 144
7 1001
8 1014
9 1044
10 1444
11 10010
12 10014
13 10144
14 10444
15 14444
16 100120
17 100104
18 100144
19 101444
20 104444
21 144444
22 1000144
23 1001040
24 1001044
25 1001444
26 1014444
27 1044444
28 1444444
29 10001044
30 10001444
31 10010404
32 10010444
33 10014444
34 10144444
35 10444444
36 14444444
37 100010404
38 100010444
39 100014444
40 100104044
41 100104444
42 100144444
43 101444444
44 104444444
45 144444444

List of values

[2, 1, 10, 14, 101, 104, 144, 1001, 1014, 1044, 1444, 10010, 10014, 10144, 10444, 14444, 100120, 100104, 100144, 101444, 104444, 144444, 1000144, 1001040, 1001044, 1001444, 1014444, 1044444, 1444444, 10001044, 10001444, 10010404, 10010444, 10014444, 10144444, 10444444, 14444444, 100010404, 100010444, 100014444, 100104044, 100104444, 100144444, 101444444, 104444444, 144444444]

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

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