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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.

A132943 Concatenation of first n imperfect numbers.

Table of values

n a(n)
1 1
2 12
3 123
4 1234
5 12345
6 123457
7 1234578
8 12345789
9 1234578910
10 123457891011
11 12345789101112
12 1234578910111213
13 123457891011121314
14 12345789101112131415
15 1234578910111213141516
16 123457891011121314151617

List of values

[1, 12, 123, 1234, 12345, 123457, 1234578, 12345789, 1234578910, 123457891011, 12345789101112, 1234578910111213, 123457891011121314, 12345789101112131415, 1234578910111213141516, 123457891011121314151617]

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

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