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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.

A254718 a(n) is the least semiprime having a(n-1) as a substring, a(1)=4.

Table of values

n a(n)
1 4
2 14
3 141
4 1141
5 11141
6 111413
7 1111413
8 11114137
9 111114137
10 1111141373
11 11111141373
12 111111413737
13 1111114137373
14 11111141373734
15 1111114137373402
16 11111141373734023
17 111111413737340234
18 11111114137373402349
19 111111114137373402349
20 1111111141373734023499

List of values

[4, 14, 141, 1141, 11141, 111413, 1111413, 11114137, 111114137, 1111141373, 11111141373, 111111413737, 1111114137373, 11111141373734, 1111114137373402, 11111141373734023, 111111413737340234, 11111114137373402349, 111111114137373402349, 1111111141373734023499]

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

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