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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.

A227949 Primes obtained by concatenating decremented numbers starting at a power of 10.

Table of values

n a(n)
1 109
2 10099
3 10987
4 1000999
5 100999897
6 10000099999
7 1000000999999
8 1000999998997
9 100000009999999
10 10000999999989997
11 1000000000999999999
12 100999897969594939291
13 1000999998997996995994993
14 100000000000009999999999999
15 10000000000000000000000000099999999999999999999999999

List of values

[109, 10099, 10987, 1000999, 100999897, 10000099999, 1000000999999, 1000999998997, 100000009999999, 10000999999989997, 1000000000999999999, 100999897969594939291, 1000999998997996995994993, 100000000000009999999999999, 10000000000000000000000000099999999999999999999999999]

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

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