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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.

A370851 Lesser of two consecutive primes such that the product of its digits is also prime and that of the other is composite.

Table of values

n a(n)
1 17
2 31
3 71
4 113
5 131
6 151
7 211
8 311
9 1117
10 1151
11 1171
12 1511
13 2111
14 11117
15 11131
16 11171
17 11311
18 111121
19 111211
20 112111
21 113111
22 131111
23 311111
24 511111
25 1111151
26 1111211
27 1111711
28 1117111
29 1171111
30 11111117
31 11111131
32 11111171
33 11111311
34 11113111
35 11131111
36 71111111

List of values

[17, 31, 71, 113, 131, 151, 211, 311, 1117, 1151, 1171, 1511, 2111, 11117, 11131, 11171, 11311, 111121, 111211, 112111, 113111, 131111, 311111, 511111, 1111151, 1111211, 1111711, 1117111, 1171111, 11111117, 11111131, 11111171, 11111311, 11113111, 11131111, 71111111]

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

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