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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.

A141311 Primes consisting of a digit and a nonempty string of 9's (i.e., primes of the form k*10^m - 1, where k is any digit).

Table of values

n a(n)
1 19
2 29
3 59
4 79
5 89
6 199
7 499
8 599
9 1999
10 2999
11 4999
12 8999
13 49999
14 59999
15 79999
16 199999
17 599999
18 799999
19 2999999
20 4999999
21 19999999
22 29999999
23 59999999
24 89999999
25 799999999
26 59999999999
27 79999999999
28 59999999999999
29 499999999999999
30 29999999999999999999

List of values

[19, 29, 59, 79, 89, 199, 499, 599, 1999, 2999, 4999, 8999, 49999, 59999, 79999, 199999, 599999, 799999, 2999999, 4999999, 19999999, 29999999, 59999999, 89999999, 799999999, 59999999999, 79999999999, 59999999999999, 499999999999999, 29999999999999999999]

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

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