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.

A086698 Two-sided semiprimes: deleting any number of digits at left or at right, but not both, leaves a semiprime.

Table of values

n a(n)
1 4
2 6
3 9
4 46
5 49
6 69
7 94
8 469
9 626
10 694
11 914
12 934
13 939
14 949
15 4694
16 4934
17 4939
18 9134
19 9346
20 9586
21 62386
22 62614
23 91346
24 959939
25 6998339
26 91439939

List of values

[4, 6, 9, 46, 49, 69, 94, 469, 626, 694, 914, 934, 939, 949, 4694, 4934, 4939, 9134, 9346, 9586, 62386, 62614, 91346, 959939, 6998339, 91439939]