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.

A382981 The smallest n-digit prime that turns composite at each step as its digits are successively appended, starting from the last.

Table of values

n a(n)
1 2
2 11
3 101
4 1019
5 10007
6 100043
7 1000003
8 10000019
9 100000007
10 1000000007
11 10000000019
12 100000000003
13 1000000000039
14 10000000000037
15 100000000000031
16 1000000000000037
17 10000000000000061
18 100000000000000003
19 1000000000000000003
20 10000000000000000051

List of values

[2, 11, 101, 1019, 10007, 100043, 1000003, 10000019, 100000007, 1000000007, 10000000019, 100000000003, 1000000000039, 10000000000037, 100000000000031, 1000000000000037, 10000000000000061, 100000000000000003, 1000000000000000003, 10000000000000000051]

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

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