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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.

A116129 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 4.

Table of values

n a(n)
1 11
2 101
3 1001
4 10001
5 100001
6 1000001
7 10000001
8 100000001
9 1000000001
10 10000000001
11 13223140496
12 20661157025
13 29752066116
14 40495867769
15 52892561984
16 66942148761
17 82644628100
18 100000000001
19 1000000000001

List of values

[11, 101, 1001, 10001, 100001, 1000001, 10000001, 100000001, 1000000001, 10000000001, 13223140496, 20661157025, 29752066116, 40495867769, 52892561984, 66942148761, 82644628100, 100000000001, 1000000000001]

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

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