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.

A239720 Primes of the form m = 10^i + 10^j - 1, where i > j >= 0.

Table of values

n a(n)
1 109
2 1009
3 10009
4 10099
5 100999
6 1000099
7 1000999
8 1000000009
9 1000009999
10 1000099999
11 1009999999
12 10000000999
13 10000099999
14 10999999999
15 100999999999
16 1000000009999
17 1000000999999
18 1099999999999
19 10000000000099
20 10009999999999

List of values

[109, 1009, 10009, 10099, 100999, 1000099, 1000999, 1000000009, 1000009999, 1000099999, 1009999999, 10000000999, 10000099999, 10999999999, 100999999999, 1000000009999, 1000000999999, 1099999999999, 10000000000099, 10009999999999]

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

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