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.

A135577 Numbers that have only the digit "1" as first, central and final digit. For numbers with 5 or more digits the rest of digits are "0".

Table of values

n a(n)
1 1
2 111
3 10101
4 1001001
5 100010001
6 10000100001
7 1000001000001
8 100000010000001
9 10000000100000001
10 1000000001000000001
11 100000000010000000001
12 10000000000100000000001
13 1000000000001000000000001
14 100000000000010000000000001
15 10000000000000100000000000001

List of values

[1, 111, 10101, 1001001, 100010001, 10000100001, 1000001000001, 100000010000001, 10000000100000001, 1000000001000000001, 100000000010000000001, 10000000000100000000001, 1000000000001000000000001, 100000000000010000000000001, 10000000000000100000000000001]

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

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