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.

A289980 Oblong (or pronic) numbers of the form x_n.y_n where z_n indicates the digit z repeated n times.

Table of values

n a(n)
1 12
2 20
3 30
4 42
5 56
6 72
7 90
8 1122
9 4422
10 9900
11 111222
12 444222
13 999000
14 11112222
15 44442222
16 99990000
17 1111122222
18 4444422222
19 9999900000
20 111111222222
21 444444222222
22 999999000000
23 11111112222222
24 44444442222222
25 99999990000000
26 1111111122222222

List of values

[12, 20, 30, 42, 56, 72, 90, 1122, 4422, 9900, 111222, 444222, 999000, 11112222, 44442222, 99990000, 1111122222, 4444422222, 9999900000, 111111222222, 444444222222, 999999000000, 11111112222222, 44444442222222, 99999990000000, 1111111122222222]

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

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