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.

A118697 Semiprimes with consecutive digits.

Table of values

n a(n)
1 4
2 6
3 9
4 10
5 21
6 34
7 65
8 87
9 123
10 321
11 543
12 789
13 901
14 1234
15 4321
16 8765
17 34567
18 56789
19 98765
20 654321
21 876543
22 901234
23 1234567
24 7654321
25 7890123
26 10987654
27 21098765
28 567890123
29 12345678901
30 54321098765
31 76543210987
32 87654321098

List of values

[4, 6, 9, 10, 21, 34, 65, 87, 123, 321, 543, 789, 901, 1234, 4321, 8765, 34567, 56789, 98765, 654321, 876543, 901234, 1234567, 7654321, 7890123, 10987654, 21098765, 567890123, 12345678901, 54321098765, 76543210987, 87654321098]

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

Content is available under The OEIS End-User License Agreement.